I m a beginner to android so i made app to display just simple x and y coordinates.
package company.com.bucky;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MotionEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public static int X;
public static int Y;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final TextView firsttextview = (TextView)findViewById(R.id.textView);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
firsttextview.setText("X : " + X + "\nY : " + Y);
}
public boolean onTouch(View v, MotionEvent event) {
this.Y = (int) event.getX();
this.Y = (int) event.getY();
return true;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
SO when i run the app i just shows the value of x and y just 0..and no change in value when i touch the screen.Thx in advance for helping
Your onTouch handler only sets the static variables, but does not update the text view.
Put firsttextview.setText("X : " + X + "\nY : " + Y);
into the onTouch handler.
Related
Starting with line 34 I am getting error: class, interface, enum expected. This is a simple percent calculator app as my introduction to android studio. I have tried fix all all the formatting suggestion I read for other people getting the same error but I had no luck. I would appreciate any suggestions or ideas on how to fix that or also if you have any basic app ideas I would love to hear them.
package com.example.bheue.percenttutorial;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView totalTextView;
EditText percentageText;
EditText numberText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
};
TextView totalTextView = (TextView) findViewById(R.id.totalText);
percentageText = (EditText) findViewById(R.id.percentageText);
numberText = (EditText) findViewById(R.id.numberText);
Button calcButton = (Button) findViewById(R.id.percentText);
calcButton.setOnClickListener(new view.OnClickListener())
#Override
public void onClick(view view){
float percentage = Float.parseFloat(percentageText.getText().toString());
float dec = percentage / 100;
float total = dec * Float.parseFloat(numberText.getText().toString());
totalTextView.setText(Float.toString(total));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
This is what your code should be:
package com.example.bheue.percenttutorial;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.uplication.hamza.helpinghands.R;
public class MainActivity extends AppCompatActivity {
TextView totalTextView;
EditText percentageText;
EditText numberText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final TextView totalTextView = (TextView) findViewById(R.id.totalText);
percentageText = (EditText) findViewById(R.id.percentageText);
numberText = (EditText) findViewById(R.id.numberText);
Button calcButton = (Button) findViewById(R.id.percentText);
calcButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
float percentage = Float.parseFloat(percentageText.getText().toString());
float dec = percentage / 100;
float total = dec * Float.parseFloat(numberText.getText().toString());
totalTextView.setText(Float.toString(total));
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Did you copy this code from somewhere and had problems in pasting?
I'm new in coding, and I was trying to make a simple app that make a subtraction from 2 variable, but when I click the button to calculate, the app crashes... Can someone help me finding the problem in the code? (Android Studio)
Here's the code:
package apps.ste.resto;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import static apps.ste.resto.R.id.risultato;
public class MainActivity extends AppCompatActivity {
TextView importo;
TextView conto;
TextView risultato;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
TextView risultato = (TextView) findViewById(R.id.textView);
TextView importo = (TextView) findViewById(R.id.editText);
TextView conto = (TextView) findViewById(R.id.editText2);
Button bottone = (Button) findViewById(R.id.button);
bottone.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result();
}
});
}
public void result(){
float result = Float.parseFloat(importo.getText().toString()) - Float.parseFloat(conto.getText().toString());
risultato.setText(Float.toString(result));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
I think you are getting null value for getText()..
SO you can try this :
public void result(){
boolean digitsOnly1 = TextUtils.isDigitsOnly(importo.getText()+"");
boolean digitsOnly2 = TextUtils.isDigitsOnly(conto.getText()+"");
if(digitsOnly1 && digitsOnly2){
float result = Float.parseFloat(importo.getText().toString()) - Float.parseFloat(conto.getText().toString());
risultato.setText(result+""));
}else{
risultato.setText("Please provide inputs");
}
}
I am creating an Android application. Here I need to get the IP address of the Android device. Below is my MainActivity code,
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.format.Formatter;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteOrder;
public class MainActivity extends AppCompatActivity {
Button button;
TextView txtView;
public static Context context = MyApplication.getAppContext();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button_ip);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
if (ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN)) {
ipAddress = Integer.reverseBytes(ipAddress);
}
byte[] ipByteArray = BigInteger.valueOf(ipAddress).toByteArray();
String ipAddressString;
try {
ipAddressString = InetAddress.getByAddress(ipByteArray)
.getHostAddress();
} catch (UnknownHostException ex) {
Log.e("WI-Resource", "Unable to get host address.");
ipAddressString = null;
}
System.out.println(ipAddress);
//txtView.setText(ipAddress);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
After creating the WiFi hotspot in my device, I started the application, then it gives following exception,
Unable to get host address
So please anyone can help me to solve this problem?
try this Android: How to Know an IP Address is a Wifi IP Address?
o can read more here: https://developer.android.com/reference/java/net/NetworkInterface.html
The image moves perfectly the first time into its place i.e detail activity image view and also returns perfectly back to the main activity but when I click the same image next time the transition animation moves the image to an incorrect (too high) offset in the detail activity and once the animation completes the image will appear to "warp" into the correct position.
Here is my DetailActivity.java file:
package com.akshitjain.popularmovies;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Callback;
import com.squareup.picasso.Picasso;
public class DetailActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
postponeEnterTransition();
}
ImageView backdropImageView = (ImageView) findViewById(R.id.detail_image_view);
final ImageView posterImageView = (ImageView) findViewById(R.id.detail_poster);
TextView overviewTextView = (TextView) findViewById(R.id.overview_text_view);
TextView releaseDateTextView = (TextView) findViewById(R.id.release_date);
TextView userRatingTextView = (TextView) findViewById(R.id.user_rating);
TextView genreTextView = (TextView) findViewById(R.id.genre);
genreTextView.setText("");
Genre genreObject = new Genre();
String genreName;
Intent intent = getIntent();
if (intent != null && intent.hasExtra(Constants.MOVIE_OBJECT_PARCELABLE_EXTRA)) {
Movies movies = intent.getParcelableExtra(Constants.MOVIE_OBJECT_PARCELABLE_EXTRA);
int[] genre;
genre = movies.genre;
for (int i = 0; i < genre.length; ++i) {
genreName = genreObject.getGenreName(genre[i]);
genreTextView.append(genreName);
if (i < genre.length - 1) {
genreTextView.append(", ");
}
}
setTitle(movies.originalTitle);
Picasso.with(getApplicationContext())
.load((Constants.IMAGE_BASE_URL + Constants.POSTER_SIZE_LARGE).trim() + movies.backdropPath)
.into(backdropImageView);
Picasso.with(getApplicationContext())
.load((Constants.IMAGE_BASE_URL + Constants.POSTER_SIZE_SMALL).trim() + movies.posterPath)
.into(posterImageView, new Callback() {
#Override
public void onSuccess() {
posterImageView.getViewTreeObserver().addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {
#Override
public boolean onPreDraw() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
posterImageView.getViewTreeObserver().removeOnPreDrawListener(this);
startPostponedEnterTransition();
}
return true;
}
}
);
}
#Override
public void onError() {
}
}
);
overviewTextView.setText(movies.overview);
releaseDateTextView.setText(movies.releaseDate);
userRatingTextView.setText(movies.userRating);
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_detail, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (id) {
case android.R.id.home:
supportFinishAfterTransition();
return true;
case R.id.action_settings:
return true;
}
return super.onOptionsItemSelected(item);
}
}
Try this.
posterImageView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
Picasso.with(getApplicationContext())
.load((Constants.IMAGE_BASE_URL + Constants.POSTER_SIZE_SMALL).trim() + movies.posterPath)
.into(posterImageView, new Callback() {
#Override
public void onSuccess() {
startPostponedEnterTransition();
}
#Override
public void onError() {
}
});
}
}
I am trying to make a basic connect 3 app as part of a course challenge.
The problem I am having is that I am unable to access the methods inside the class Players in order to set which buttons have been pressed by which players: Cannot resolve method 'noughtsPlayer'.
I created an instance of Players on the onCreate method and declared it at the top of the script. That instance itself is recognised but for some reason the contained methods, noughtsPlayer and crossesPlayer are not.
MainActivity.java
package com.example.richardcurteis.connect3;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
public boolean noughtsTurn;
ArrayList board;
String players;
public void receiveClick(View view) {
String buttonPressed = (String) view.getTag();
board.remove(buttonPressed);
if (view instanceof Button) {
Button B = (Button) view;
B.setText(noughtsTurn ? players.noughtsPlayer() : players.crossesPlayer());
}
}
class Players {
public String noughtsPlayer() { return "O"; }
public String crossesPlayer() { return "X"; }
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
boolean noughtsTurn = true;
board = new ArrayList();
for (int x = 0; x < getBoardSize(); x++) {
String y = String.valueOf(x);
board.add(y);
}
Players players = new Players();
}
public int getBoardSize() {
int buttonCount = 0;
TableLayout tableLayout = (TableLayout) findViewById(R.id.tableLayout);
for (int rowIndex = 0; rowIndex < tableLayout.getChildCount(); rowIndex++) {
View tableLayoutChild = tableLayout.getChildAt(rowIndex);
if (tableLayoutChild instanceof TableRow) {
for (int i = 0; i < ((ViewGroup) tableLayoutChild).getChildCount(); i++) {
View view = ((ViewGroup) tableLayoutChild).getChildAt(i);
if (view instanceof Button) {
buttonCount++;
}
}
}
}
return buttonCount;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
You have global variable String players and local variable Players players.
This is problem.
And class String doesn't have those methods.
To solve this problem change String players; to Players players;
and Players players = new Players(); to players = new Players();