Hello all, My button (close) in the closeListener (in my java code). When I push this button (close) I go back correctly in my first page but it don't close correctly my Rent page (second page), my second page remain open below my first page (hide behind the first page), how can I do for close correctly the second page (Rent) ?
package albencreation.realestateapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Rent extends AppCompatActivity {
EditText price = null;
EditText profit = null;
TextView result = null;
Button envoyer = null;
Button close = null;
Button info = null;
Button clear = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.rent);
price = (EditText) findViewById(R.id.price);
profit = (EditText) findViewById(R.id.profit);
result = (TextView) findViewById(R.id.result);
envoyer = (Button) findViewById(R.id.buttcalculate);
close = (Button) findViewById(R.id.buttclose);
info = (Button) findViewById(R.id.buttinfo);
clear = (Button) findViewById(R.id.buttclear);
envoyer.setOnClickListener(envoyerListener);
close.setOnClickListener(closeListener);
info.setOnClickListener(infoListener);
clear.setOnClickListener(clearListener);
}
private OnClickListener envoyerListener = new OnClickListener() {
#Override
public void onClick(View v) {
String p = price.getText().toString();
String o = profit.getText().toString();
float pValue;
if (p.isEmpty()) {
pValue = 0;
} else {
pValue = Float.valueOf(p);
}
float oValue;
if (o.isEmpty()) {
oValue = 0;
} else {
oValue = Float.valueOf(o);
}
float resultat = oValue * pValue / 100;
result.setText("the rent is " + String.valueOf(resultat) + " currency");
}
};
private OnClickListener closeListener = new OnClickListener() {
#Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, MainActivity.class);
startActivity(jumpage);
}
};
private OnClickListener infoListener = new OnClickListener() {
#Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, Inforent.class);
startActivity(jumpage);
}
};
private OnClickListener clearListener = new OnClickListener() {
#Override
public void onClick(View v) {
price.getText().clear();
profit.getText().clear();
String defaut = "result rent";
result.setText(defaut);
}
};
}
You can call the finish() method to finish your activity for good:
private OnClickListener closeListener = new OnClickListener() {
#Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, MainActivity.class);
startActivity(jumpage);
Rent.this.finish();
}
};
Instead of this
private OnClickListener closeListener = new OnClickListener() {
#Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, MainActivity.class);
startActivity(jumpage);
}
};
Just write as below
private OnClickListener closeListener = new OnClickListener() {
#Override
public void onClick(View v) {
this.finish();
}
};
Just call finish() to close Rent activity.
Try this:
private OnClickListener closeListener = new OnClickListener() {
#Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, MainActivity.class);
startActivity(jumpage);
finish();
}
};
Related
So I am new and working on an app, so I have created homepage of it and then when we click on anyone of it it opens a new activity in which when clicking the button to get the answer doesnt work and it goes back to the homepage. Please help me solve this!
This is my code of main activity
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CardView Currency = (CardView) findViewById(R.id.Currency);
CardView Area = (CardView) findViewById(R.id.Area);
CardView Length = (CardView) findViewById(R.id.Length);
CardView Temperature = (CardView) findViewById(R.id.Temperature);
CardView Time = (CardView) findViewById(R.id.Time);
CardView Weight = (CardView) findViewById(R.id.Weight);
Currency.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Currency.class);
startActivity(intent);
}
});
Weight.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Weight.class);
startActivity(intent);
}
});
Time.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Time.class);
startActivity(intent);
}
});
Length.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Length.class);
startActivity(intent);
}
});
Area.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Area.class);
startActivity(intent);
}
});
Temperature.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Temperature.class);
startActivity(intent);
}
});
}
And this is of my new activity to open at homepage and convert the value
public class Weight extends AppCompatActivity {
private TextView textView;
private Button button;
private EditText editText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_weight);
button = findViewById(R.id.button);
textView = findViewById(R.id.textView);
editText = findViewById(R.id.editText);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Toast.makeText(Weight.this, "Request Proceeded", Toast.LENGTH_SHORT).show();
String s = editText.getText().toString();
Integer.parseInt(s);
int kg = Integer.parseInt(s);
double pound = 2.205 * kg;
textView.setText("The corresponding value in Pound is" + pound);
}
});
}
I'm new to developing and i bought a book, Big Nerd Ranch Guide to Android Programming. I finished chapter 2 and everything worked fine on this app it showed me how to make. Now im trying to do the challenges at the end and it wont work. Its giving me an error for something i didnt change at all, and it worked yesterday. The challenge wanted me to add a Previous button to the mix.
"Cannot solve method 'makeText(anonymous android.view.View.OnClickListener, int, int)'
The error is at the very bottom where im trying to create a Toast.
package com.example.lthol.geoquiz;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends AppCompatActivity {
private Button mTrueButton;
private Button mFalseButton;
private Button mNextButton;
private Button mPrevButton;
private TextView mQuestionTextView;
private Question[] mQuestionBank = new Question[] {
new Question(R.string.question_australia, true),
new Question(R.string.question_oceans, true),
new Question(R.string.question_mideast, false),
new Question(R.string.question_africa, false),
new Question(R.string.question_americas, true),
new Question(R.string.question_asia, true),
};
private int mCurrentIndex = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
mTrueButton = (Button) findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(true);
}
});
mFalseButton = (Button) findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(false);
}
});
mNextButton = (Button) findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
updateQuestion();
mPrevButton = (Button) findViewById(R.id.prev_button);
mPrevButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex - 1) % mQuestionBank.length;
updateQuestion();
}
});
updateQuestion();
}
private void updateQuestion() {
int question = mQuestionBank[mCurrentIndex].getTextResId();
mQuestionTextView.setText(question);
}
private void checkAnswer(boolean userPressedTrue) {
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
int messageResId = 0;
if (userPressedTrue == answerIsTrue) {
messageResId = R.string.correct_toast;
} else {
messageResId = R.string.incorrect_toast;
}
Toast.makeText(this, messageResId, Toast.LENGTH_SHORT)
.show();
}
}
The mPrevButton onClick listener is actually contained in the mNextButton implementation. You need to close the bracket so that they are separate.
When app starts at first, start Activity with two button: Create File and Settings. Then if I click on button Create File - start Activity where I write text and save in file.
If we have error when file saved - start activity with two button. Else start another Activity with three buttons: Look file, Edit File, Settings.
How organize correct transitions between this Activity and How start activity with three buttons if file already saved?
public class MainFirstActivity extends AppCompatActivity {
private Button createFile;
private Button settings;
private boolean start = true;
private static final String MY_SETTINGS = "my_settings";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_first);
createFile = (Button) findViewById(R.id.create_file);
settings = (Button) findViewById(R.id.settings);
createFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainFirstActivity.this, CreateFileActivity.class);
startActivity(intent);
// MainFirstActivity.this.finish();
}
});
settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainFirstActivity.this, SettingActivity.class);
startActivity(intent);
}
});
}
#Override
protected void onResume() {
super.onResume();
File f = new File(CreateFileActivity.FILE_NAME);
if(!f.exists() && !f.isDirectory() && start) {
Intent intent = new Intent(MainFirstActivity.this, MainWithFileActivity.class);
startActivity(intent);
//start=false;
MainFirstActivity.this.finish();
Log.e("err", "intent");
}
}
}
MainWithFileActivity
public class MainWithFileActivity extends AppCompatActivity {
public static final String MY_SETTINGS = "MY_SETTINGS";
private Button lookFile;
private Button editFile;
private Button settings;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_if_first);
lookFile = (Button) findViewById(R.id.look_file);
settings = (Button) findViewById(R.id.settings);
editFile = (Button) findViewById(R.id.edit_file);
lookFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainWithFileActivity.this, LookFileActivity.class);
startActivity(intent);
}
});
editFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainWithFileActivity.this,CreateFileActivity.class);
startActivity(intent);
}
});
settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainWithFileActivity.this, SettingActivity.class);
startActivity(intent);
}
});
}
}
Simply check if the file exists. If it does not, hide the lookFile button
Add this in your MainWithFileActivity onCreate method
File f = new File(CreateFileActivity.FILE_NAME);
if(!f.exists() && !f.isDirectory()) {
lookFile.setVisibility(View.GONE);
}
I am a beginner, When i add music files to Sd card the list view in my Music app isn't updating untill i reboot the device or my genymotion emulator. and the songs are also playing with lagging.
Here is my main Acivity.java code :
import com.techdsk.musicdsk.musicdsk.adapter.CustomAdapter;
import com.techdsk.musicdsk.musicdsk.controls.Controls;
import com.techdsk.musicdsk.musicdsk.service.SongService;
import com.techdsk.musicdsk.musicdsk.util.MediaItem;
import com.techdsk.musicdsk.musicdsk.util.PlayerConstants;
import com.techdsk.musicdsk.musicdsk.util.UtilFunctions;
public class MainActivity extends Activity {
String LOG_CLASS = "MainActivity";
CustomAdapter customAdapter = null;
static TextView playingSong;
Button btnPlayer;
static Button btnPause, btnPlay, btnNext, btnPrevious;
Button btnStop;
LinearLayout mediaLayout;
static LinearLayout linearLayoutPlayingSong;
ListView mediaListView;
ProgressBar progressBar;
TextView textBufferDuration, textDuration;
static ImageView imageViewAlbumArt;
static Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().hide();
setContentView(R.layout.activity_main);
context = MainActivity.this;
init();
}
private void init() {
getViews();
setListeners();
playingSong.setSelected(true);
progressBar.getProgressDrawable().setColorFilter(getResources().getColor(R.color.white), Mode.SRC_IN);
if(PlayerConstants.SONGS_LIST.size() <= 0){
PlayerConstants.SONGS_LIST = UtilFunctions.listOfSongs(getApplicationContext());
}
setListItems();
}
private void setListItems() {
customAdapter = new CustomAdapter(this,R.layout.custom_list, PlayerConstants.SONGS_LIST);
mediaListView.setAdapter(customAdapter);
mediaListView.setFastScrollEnabled(true);
}
private void getViews() {
playingSong = (TextView) findViewById(R.id.textNowPlaying);
btnPlayer = (Button) findViewById(R.id.btnMusicPlayer);
mediaListView = (ListView) findViewById(R.id.listViewMusic);
mediaLayout = (LinearLayout) findViewById(R.id.linearLayoutMusicList);
btnPause = (Button) findViewById(R.id.btnPause);
btnPlay = (Button) findViewById(R.id.btnPlay);
linearLayoutPlayingSong = (LinearLayout) findViewById(R.id.linearLayoutPlayingSong);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
btnStop = (Button) findViewById(R.id.btnStop);
textBufferDuration = (TextView) findViewById(R.id.textBufferDuration);
textDuration = (TextView) findViewById(R.id.textDuration);
imageViewAlbumArt = (ImageView) findViewById(R.id.imageViewAlbumArt);
btnNext = (Button) findViewById(R.id.btnNext);
btnPrevious = (Button) findViewById(R.id.btnPrevious);
}
private void setListeners() {
mediaListView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View item, int position, long id){
Log.d("TAG", "TAG Tapped INOUT(IN)");
PlayerConstants.SONG_PAUSED = false;
PlayerConstants.SONG_NUMBER = position;
boolean isServiceRunning = UtilFunctions.isServiceRunning(SongService.class.getName(), getApplicationContext());
if (!isServiceRunning) {
Intent i = new Intent(getApplicationContext(),SongService.class);
startService(i);
} else {
PlayerConstants.SONG_CHANGE_HANDLER.sendMessage(PlayerConstants.SONG_CHANGE_HANDLER.obtainMessage());
}
updateUI();
changeButton();
Log.d("TAG", "TAG Tapped INOUT(OUT)");
}
});
btnPlayer.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,AudioPlayerActivity.class);
startActivity(i);
}
});
btnPlay.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.playControl(getApplicationContext());
}
});
btnPause.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.pauseControl(getApplicationContext());
}
});
btnNext.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.nextControl(getApplicationContext());
}
});
btnPrevious.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.previousControl(getApplicationContext());
}
});
btnStop.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), SongService.class);
stopService(i);
linearLayoutPlayingSong.setVisibility(View.GONE);
}
});
imageViewAlbumArt.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,AudioPlayerActivity.class);
startActivity(i);
}
});
}
#Override
protected void onResume() {
super.onResume();
try{
boolean isServiceRunning = UtilFunctions.isServiceRunning(SongService.class.getName(), getApplicationContext());
if (isServiceRunning) {
updateUI();
}else{
linearLayoutPlayingSong.setVisibility(View.GONE);
}
changeButton();
PlayerConstants.PROGRESSBAR_HANDLER = new Handler(){
#Override
public void handleMessage(Message msg){
Integer i[] = (Integer[])msg.obj;
textBufferDuration.setText(UtilFunctions.getDuration(i[0]));
textDuration.setText(UtilFunctions.getDuration(i[1]));
progressBar.setProgress(i[2]);
}
};
}catch(Exception e){}
}
#SuppressWarnings("deprecation")
public static void updateUI() {
try{
MediaItem data = PlayerConstants.SONGS_LIST.get(PlayerConstants.SONG_NUMBER);
playingSong.setText(data.getTitle() + " " + data.getArtist() + "-" + data.getAlbum());
Bitmap albumArt = UtilFunctions.getAlbumart(context, data.getAlbumId());
if(albumArt != null){
imageViewAlbumArt.setBackgroundDrawable(new BitmapDrawable(albumArt));
}else{
imageViewAlbumArt.setBackgroundDrawable(new BitmapDrawable(UtilFunctions.getDefaultAlbumArt(context)));
}
linearLayoutPlayingSong.setVisibility(View.VISIBLE);
}catch(Exception e){}
}
public static void changeButton() {
if(PlayerConstants.SONG_PAUSED){
btnPause.setVisibility(View.GONE);
btnPlay.setVisibility(View.VISIBLE);
}else{
btnPause.setVisibility(View.VISIBLE);
btnPlay.setVisibility(View.GONE);
}
}
public static void changeUI(){
updateUI();
changeButton();
}
}
Here is my Audioplayer Activity.java Code :
package com.techdsk.musicdsk.musicdsk;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.techdsk.musicdsk.musicdsk.controls.Controls;
import com.techdsk.musicdsk.musicdsk.service.SongService;
import com.techdsk.musicdsk.musicdsk.util.PlayerConstants;
import com.techdsk.musicdsk.musicdsk.util.UtilFunctions;
public class AudioPlayerActivity extends Activity {
Button btnBack;
static Button btnPause;
Button btnNext;
static Button btnPlay;
static TextView textNowPlaying;
static TextView textAlbumArtist;
static TextView textComposer;
static LinearLayout linearLayoutPlayer;
ProgressBar progressBar;
static Context context;
TextView textBufferDuration, textDuration;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().hide();
setContentView(R.layout.audio_player);
context = this;
init();
}
private void init() {
getViews();
setListeners();
progressBar.getProgressDrawable().setColorFilter(getResources().getColor(R.color.white), Mode.SRC_IN);
PlayerConstants.PROGRESSBAR_HANDLER = new Handler(){
#Override
public void handleMessage(Message msg){
Integer i[] = (Integer[])msg.obj;
textBufferDuration.setText(UtilFunctions.getDuration(i[0]));
textDuration.setText(UtilFunctions.getDuration(i[1]));
progressBar.setProgress(i[2]);
}
};
}
private void setListeners() {
btnBack.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.previousControl(getApplicationContext());
}
});
btnPause.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.pauseControl(getApplicationContext());
}
});
btnPlay.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.playControl(getApplicationContext());
}
});
btnNext.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Controls.nextControl(getApplicationContext());
}
});
}
public static void changeUI(){
updateUI();
changeButton();
}
private void getViews() {
btnBack = (Button) findViewById(R.id.btnBack);
btnPause = (Button) findViewById(R.id.btnPause);
btnNext = (Button) findViewById(R.id.btnNext);
btnPlay = (Button) findViewById(R.id.btnPlay);
textNowPlaying = (TextView) findViewById(R.id.textNowPlaying);
linearLayoutPlayer = (LinearLayout) findViewById(R.id.linearLayoutPlayer);
textAlbumArtist = (TextView) findViewById(R.id.textAlbumArtist);
textComposer = (TextView) findViewById(R.id.textComposer);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
textBufferDuration = (TextView) findViewById(R.id.textBufferDuration);
textDuration = (TextView) findViewById(R.id.textDuration);
textNowPlaying.setSelected(true);
textAlbumArtist.setSelected(true);
}
#Override
protected void onResume() {
super.onResume();
boolean isServiceRunning = UtilFunctions.isServiceRunning(SongService.class.getName(), getApplicationContext());
if (isServiceRunning) {
updateUI();
}
changeButton();
}
public static void changeButton() {
if(PlayerConstants.SONG_PAUSED){
btnPause.setVisibility(View.GONE);
btnPlay.setVisibility(View.VISIBLE);
}else{
btnPause.setVisibility(View.VISIBLE);
btnPlay.setVisibility(View.GONE);
}
}
private static void updateUI() {
try{
String songName = PlayerConstants.SONGS_LIST.get(PlayerConstants.SONG_NUMBER).getTitle();
String artist = PlayerConstants.SONGS_LIST.get(PlayerConstants.SONG_NUMBER).getArtist();
String album = PlayerConstants.SONGS_LIST.get(PlayerConstants.SONG_NUMBER).getAlbum();
String composer = PlayerConstants.SONGS_LIST.get(PlayerConstants.SONG_NUMBER).getComposer();
textNowPlaying.setText(songName);
textAlbumArtist.setText(artist + " - " + album);
if(composer != null && composer.length() > 0){
textComposer.setVisibility(View.VISIBLE);
textComposer.setText(composer);
}else{
textComposer.setVisibility(View.GONE);
}
}catch(Exception e){
e.printStackTrace();
}
try{
long albumId = PlayerConstants.SONGS_LIST.get(PlayerConstants.SONG_NUMBER).getAlbumId();
Bitmap albumArt = UtilFunctions.getAlbumart(context, albumId);
if(albumArt != null){
linearLayoutPlayer.setBackgroundDrawable(new BitmapDrawable(albumArt));
}else{
linearLayoutPlayer.setBackgroundDrawable(new BitmapDrawable(UtilFunctions.getDefaultAlbumArt(context)));
}
}catch(Exception e){
e.printStackTrace();
}
}
}
custom adapter .java code :
package com.techdsk.musicdsk.musicdsk.adapter;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.techdsk.musicdsk.musicdsk.R;
import com.techdsk.musicdsk.musicdsk.util.MediaItem;
import com.techdsk.musicdsk.musicdsk.util.UtilFunctions;
public class CustomAdapter extends ArrayAdapter<MediaItem>{
ArrayList<MediaItem> listOfSongs;
Context context;
LayoutInflater inflator;
public CustomAdapter(Context context, int resource, ArrayList<MediaItem> listOfSongs) {
super(context, resource, listOfSongs);
this.listOfSongs = listOfSongs;
this.context = context;
inflator = LayoutInflater.from(context);
}
private class ViewHolder{
TextView textViewSongName, textViewArtist, textViewDuration;
}
ViewHolder holder;
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View myView = convertView;
if(convertView == null){
myView = inflator.inflate(R.layout.custom_list, parent, false);
holder = new ViewHolder();
holder.textViewSongName = (TextView) myView.findViewById(R.id.textViewSongName);
holder.textViewArtist = (TextView) myView.findViewById(R.id.textViewArtist);
holder.textViewDuration = (TextView) myView.findViewById(R.id.textViewDuration);
myView.setTag(holder);
}else{
holder = (ViewHolder)myView.getTag();
}
MediaItem detail = listOfSongs.get(position);
holder.textViewSongName.setText(detail.toString());
holder.textViewArtist.setText(detail.getAlbum() + " - " + detail.getArtist());
holder.textViewDuration.setText(UtilFunctions.getDuration(detail.getDuration()));
return myView;
}
}
when you add the file you can use NotifyDatasetChanged(). this will tell your adapter to refresh its data. So when your source array is updated after adding a new file you can call NotifyDatasetChanged() method.
as Ex. if you have a method named Add() inside your adapter then.
public void Add (item e){
items.add (e);
NotifyDatasetChanged();
}
will refresh your data.
Your list is not getting updated because it is not informed about the data change,
the documentation in the ADW explains:
notifyDataSetChanged() Notifies the attached observers that the
underlying data has been changed and any View reflecting the data set
should refresh itself.
Solution
Notify yor adapter:
customAdapter.notifyDataSetChanged();
Hello i'm creating an app to scan buisness cards, it has lot of views but one works very slow it has 19 buttons. Is it possible that slow working of my app is caused by this number of buttons? I've tried to put listeners outside of onCreate but it didn't help. This is my java file conected to this view:
public class Szczegoly extends Activity {
long contactID;
Bitmap contactFoto;
int imagebig=0;
int w;
Contact contact;
EditText tv1;
EditText tv2;
EditText tv3;
EditText tv4;
EditText tv5;
ImageView i;
Button b1;
Button b2;
Button b3;
Button b4;
Button b5;
Button b6;
Button b7;
Button b8;
Button b9;
Button b10;
Context to;
Button accept1;
Button accept2;
Button accept3;
Button accept4;
Button accept5;
Button cancel1;
Button cancel2;
Button cancel3;
Button cancel4;
Button cancel5;
Context context;
OnClickListener accept1listener = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==1)
{
contact.savedata_nr(edit_nr,tv1,tv2,tv3,tv4,tv5,context);
closeEdit();
}
}
};
OnClickListener accept2listener = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==2)
{
contact.savedata_nr(edit_nr,tv1,tv2,tv3,tv4,tv5,context);
closeEdit();
}
}
};
OnClickListener accept3listener = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==3)
{
contact.savedata_nr(edit_nr,tv1,tv2,tv3,tv4,tv5,context);
closeEdit();
}
}
};
OnClickListener accept4listener = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==4)
{
contact.savedata_nr(edit_nr,tv1,tv2,tv3,tv4,tv5,context);
closeEdit();
}
}
};
OnClickListener accept5listener = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==5)
{
contact.savedata_nr(edit_nr,tv1,tv2,tv3,tv4,tv5,context);
closeEdit();
}
}
};
OnClickListener cancel1listener = new OnClickListener() {
#Override
public void onClick(View v) {
tv1.setText(contact.FirstName);
closeEdit();
}
};
OnClickListener cancel2listener = new OnClickListener() {
#Override
public void onClick(View v) {
tv1.setText(contact.FirstName);
closeEdit();
}
};
OnClickListener cancel3listener = new OnClickListener() {
#Override
public void onClick(View v) {
tv1.setText(contact.FirstName);
closeEdit();
}
};
OnClickListener cancel4listener = new OnClickListener() {
#Override
public void onClick(View v) {
tv1.setText(contact.FirstName);
closeEdit();
}
};
OnClickListener cancel5listener = new OnClickListener() {
#Override
public void onClick(View v) {
tv1.setText(contact.FirstName);
closeEdit();
}
};
OnClickListener b1lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
finish();
}
}
};
OnClickListener b2lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
contact.delete();
finish();
}
}
};
OnClickListener b3lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
}
}
};
OnClickListener b4lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
Uri call = Uri.parse("tel:"+contact.Phone1);
Intent intent = new Intent(Intent.ACTION_CALL, call);
startActivity(intent);
}
}
};
OnClickListener b5lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
}
}
};
OnClickListener b6lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
if(tv1.isEnabled())
{
tv1.setSelected(false);
tv1.setEnabled(false);
}
else
{
cancel1.setVisibility(Button.VISIBLE);
accept1.setVisibility(Button.VISIBLE);
b6.setVisibility(Button.INVISIBLE);
tv1.setEnabled(true);
tv1.setSelected(true);
tv1.setFocusableInTouchMode(true);
tv1.requestFocus();
tv1.setSelection(tv1.getText().length());
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (inputMethodManager != null) {
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
}
edit_nr= 1;
}
}
};
OnClickListener b7lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0)
{
if(tv2.isEnabled())
tv2.setEnabled(false);
else
{
cancel2.setVisibility(Button.VISIBLE);
accept2.setVisibility(Button.VISIBLE);
b7.setVisibility(Button.INVISIBLE);
tv2.setEnabled(true);
tv2.setSelected(true);
tv2.setFocusableInTouchMode(true);
tv2.requestFocus();
tv2.setSelection(tv2.getText().length());
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (inputMethodManager != null) {
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
}
edit_nr= 2;
}
}
};
OnClickListener b8lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr == 0)
{
if(tv3.isEnabled())
tv3.setEnabled(false);
else
{
cancel3.setVisibility(Button.VISIBLE);
accept3.setVisibility(Button.VISIBLE);
b8.setVisibility(Button.INVISIBLE);
tv3.setEnabled(true);
tv3.setEnabled(true);
tv3.setSelected(true);
tv3.setFocusableInTouchMode(true);
tv3.requestFocus();
tv3.setSelection(tv3.getText().length());
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (inputMethodManager != null) {
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
}
edit_nr=3;
}
}
};
OnClickListener b9lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr ==0 )
{
if(tv4.isEnabled())
tv4.setEnabled(false);
else
{
cancel4.setVisibility(Button.VISIBLE);
accept4.setVisibility(Button.VISIBLE);
b9.setVisibility(Button.INVISIBLE);
tv4.setEnabled(true);
tv4.setEnabled(true);
tv4.setSelected(true);
tv4.setFocusableInTouchMode(true);
tv4.requestFocus();
tv4.setSelection(tv4.getText().length());
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (inputMethodManager != null) {
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
}
edit_nr= 4;
}
}
};
OnClickListener b10lisner = new OnClickListener() {
#Override
public void onClick(View v) {
if(edit_nr==0)
{
if(tv5.isEnabled())
tv5.setEnabled(false);
else
{
cancel5.setVisibility(Button.VISIBLE);
accept5.setVisibility(Button.VISIBLE);
b10.setVisibility(Button.INVISIBLE);
tv5.setEnabled(true);
tv5.setEnabled(true);
tv5.setSelected(true);
tv5.setFocusableInTouchMode(true);
tv5.requestFocus();
tv5.setSelection(tv5.getText().length());
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (inputMethodManager != null)
{
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
}
edit_nr= 5;
}
}
};
int edit_nr=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_szczegoly);
Log.d("dupa","dupa1");
context = this;
Intent intent = getIntent();
contactID = intent.getLongExtra("contactID", 0);
contact = new Contact(contactID, this);
tv1 = (EditText) findViewById(R.id.editText1);
tv2 = (EditText) findViewById(R.id.editText2);
tv3 = (EditText) findViewById(R.id.editText3);
tv4 = (EditText) findViewById(R.id.editText4);
tv5 = (EditText) findViewById(R.id.editText5);
i = (ImageView) findViewById(R.id.imageView1);
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
b3 = (Button) findViewById(R.id.button3);
b4 = (Button) findViewById(R.id.button4);
b5 = (Button) findViewById(R.id.button5);
b6 = (Button) findViewById(R.id.button6);
b7 = (Button) findViewById(R.id.button7);
b8 = (Button) findViewById(R.id.button8);
b9 = (Button) findViewById(R.id.button9);
b10 = (Button) findViewById(R.id.button10);
tv1.setText(contact.FirstName);
tv2.setText(contact.LastName);
tv3.setText(contact.Phone1);
tv4.setText(contact.Phone2);
tv5.setText(contact.EmaiL);
accept1 = (Button) findViewById(R.id.accept1);
accept2 = (Button) findViewById(R.id.accept2);
accept3 = (Button) findViewById(R.id.accept3);
accept4 = (Button) findViewById(R.id.accept4);
accept5 = (Button) findViewById(R.id.accept5);
cancel1 =(Button) findViewById(R.id.cancel1);
cancel2 =(Button) findViewById(R.id.cancel2);
cancel3 =(Button) findViewById(R.id.cancel3);
cancel4 =(Button) findViewById(R.id.cancel4);
cancel5 =(Button) findViewById(R.id.cancel5);
}
public void closeEdit()
{
tv1.setSelected(false);
tv1.setEnabled(false);
tv2.setSelected(false);
tv2.setEnabled(false);
tv3.setSelected(false);
tv3.setEnabled(false);
tv4.setSelected(false);
tv4.setEnabled(false);
tv5.setSelected(false);
tv5.setEnabled(false);
cancel1.setVisibility(Button.INVISIBLE);
accept1.setVisibility(Button.INVISIBLE);
b6.setVisibility(Button.VISIBLE);
cancel2.setVisibility(Button.INVISIBLE);
accept2.setVisibility(Button.INVISIBLE);
b7.setVisibility(Button.VISIBLE);
cancel3.setVisibility(Button.INVISIBLE);
accept3.setVisibility(Button.INVISIBLE);
b8.setVisibility(Button.VISIBLE);
cancel4.setVisibility(Button.INVISIBLE);
accept4.setVisibility(Button.INVISIBLE);
b9.setVisibility(Button.VISIBLE);
cancel5.setVisibility(Button.INVISIBLE);
accept5.setVisibility(Button.INVISIBLE);
b10.setVisibility(Button.VISIBLE);
edit_nr=0;
}
public void onResume() {
super.onResume();
Log.d("dupa","dupa");
Point size = new Point();
Display display = getWindowManager().getDefaultDisplay();
display.getSize(size);
to = this;
w = size.x;
contactFoto = Bitmap.createScaledBitmap(contact.photo, w, (int) (w*contact.photo.getHeight()/contact.photo.getWidth()), true);
i.setImageBitmap(contactFoto);
accept1.setOnClickListener(accept1listener);
accept2.setOnClickListener(accept2listener);
accept3.setOnClickListener(accept3listener);
accept4.setOnClickListener(accept4listener);
accept5.setOnClickListener(accept5listener);
cancel1.setOnClickListener(cancel1listener);
cancel2.setOnClickListener(cancel2listener);
cancel3.setOnClickListener(cancel3listener);
cancel4.setOnClickListener(cancel4listener);
cancel5.setOnClickListener(cancel5listener);
b1.setOnClickListener(b1lisner);
b2.setOnClickListener(b2lisner);
b3.setOnClickListener(b3lisner);
b4.setOnClickListener(b4lisner);
b5.setOnClickListener(b5lisner);
b6.setOnClickListener(b6lisner);
b7.setOnClickListener(b7lisner);
b8.setOnClickListener(b8lisner);
b9.setOnClickListener(b9lisner);
b10.setOnClickListener(b10lisner);
}
}
The number of buttons by itself is not a likely cause of slowness. However, from the code it seems as if many actions from listeners (ie contact.savedata_nr) might be running on the main/UI thread which could cause slowness, depending on what happens when these methods are called. As mentioned in the comment, creating Bitmap might be better task to be carried out in the background as well.
To fix this, you should review your code and see what can be run in the background thread instead. Operations like saving can be done on the background thread, and then any updates to the GUI after these should be carried out on UI thread. If the background operation takes a long time, it's a good idea to up a progress indicator to show the user that something is happening and that the screen isn't just stuck.
You can read about Android threading here.
The basic example would be:
new Thread(new Runnable()
{
public void run()
{
//put background code here
contact.save(...)
//after background task is finished, update the UI
runOnUiThread(new Runnable()
{
#Override
public void run()
{
//put UI code here
textview.setText(...);
}
});
}
}).start();