have 4 activity : Main Activity,p1,p2,p3
my resume button not working . i want when i click in resume button app open my last activity .
for example : when in p2 click go to main , then in main when click resume , p2 open . here is my code :
Main Activity :
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page);
Button resume = (Button) findViewById(R.id.resume);
Button next = (Button) findViewById(R.id.next);
Button exit = (Button) findViewById(R.id.exit);
resume.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences myPref = getSharedPreferences("APP_SHARED_PREF", Context.MODE_PRIVATE);
String lastActivity= myPref.getString("lastactivity","");
try {
Intent fooActivity = new Intent(MainActivity.this,Class.forName(lastActivity));
startActivity(fooActivity);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
});
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, p1.class);
startActivity(intent);
}
});
exit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveTaskToBack(true);
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
});
}
}
XML layout :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:text="resume"
android:layout_width="wrap_content"
android:id="#+id/resume"
android:layout_height="wrap_content" />
<Button
android:text="next"
android:id="#+id/next"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/exit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="exit"/>
</LinearLayout>
p1 :
public class p1 extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.p1);
Button next = (Button) findViewById(R.id.next);
Button home=(Button)findViewById(R.id.home);
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(p1.this, p2.class);
startActivity(intent);
}
});
home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(p1.this, MainActivity.class);
startActivity(intent);
}
});
}
private void storeCurrentActivity(){
SharedPreferences myPref =getSharedPreferences("APP_SHARED_PREF", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = myPref.edit();
editor.putString("lastactivity", this.getClass().getSimpleName());
editor.commit();
}
#Override
public void onResume(){
super.onResume();
storeCurrentActivity();
}
}
XML :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:text="next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/next"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="page 1"/>
<Button
android:text="go in main"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/home"/>
</LinearLayout>
and p2,p3 like p1
and this my manifast :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.er.myapplication">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".p1"
android:label="#string/title_activity_main2"
android:theme="#style/AppTheme.NoActionBar" />
<activity
android:name=".p2"
android:label="#string/title_activity_p2"
android:theme="#style/AppTheme.NoActionBar" />
<activity
android:name=".p3"
android:label="#string/title_activity_p3"
android:theme="#style/AppTheme.NoActionBar"/>
</application>
</manifest>
you have to do below things to achieve what you want
whenever you open activity you have to save previous activity name in prefrance.
when you press resume button get activity name from prefrance and open activity using below code
Intent intent = new Intent();
intent.setClassName("com.android.browser","com.android.BrowserActivity");
context.startActivity(intent);
// clear previous activity before start
when you app relaunch app then do step 2 again in main Activity
in this type of approch you have to maintain flow of application using singletone or clear stack before launch activity. because you have to handle backbutton
Related
I'm trying to make a game but I need the user to fill in the username before jumping from Main Activity to Activity 2.
If the username is empty, itdoesn't do anything.
If the username has at least one letter, it launches second activity.
In my case it never works and I don't know what I'm doing wrong.
This is my code.
MainActivity.java
public class MainActivity extends AppCompatActivity {
EditText et1;
TextView tv1;
String usuario;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et1 = findViewById(R.id.et1);
tv1 = findViewById(R.id.tv1);
/*Button next = findViewById(R.id.boton);
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), MainActivity2.class);
startActivity(myIntent);
}
});*/
et1.setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
usuario = et1.getText().toString();
if(et1.getText().toString().trim().length() > 0) {
if((event.getAction() == KeyEvent.ACTION_DOWN) && (event.getAction() == KeyEvent.KEYCODE_ENTER)) {
startActivity2();
}
}
return false;
}
});
}
public boolean startActivity2(){
Intent myIntent = new Intent(this, MainActivity2.class);
startActivity(myIntent);
return false;
}
And the activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/texto"
android:layout_centerVertical="true"
android:layout_marginRight="50dp"
android:layout_marginLeft="50dp"
android:background="#ff8200"
android:layout_marginEnd="50dp"
android:layout_marginStart="50dp" />
<Button
android:id="#+id/boton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="jump"
android:layout_below="#+id/tv1"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/et1"
android:ems="7"
android:inputType="text"
android:maxLines="1"
android:maxLength="11"
android:layout_toRightOf="#+id/tv1"
android:layout_centerInParent="true"/>
</RelativeLayout>
I tried for the ifs !isEmpty(), trim(), !equals and absolutely nothing.
Here is the manifest, if necesarry.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.juegocartas3">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.JuegoCartas3">
<activity
android:name=".MainActivity3"
android:exported="false" />
<activity
android:name=".MainActivity2"
android:exported="false" />
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Try this-
public class MainActivity extends AppCompatActivity {
EditText et1;
TextView tv1;
String usuario;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et1 = findViewById(R.id.et1);
tv1 = findViewById(R.id.tv1);
et1.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if ((actionId & EditorInfo.IME_MASK_ACTION) == EditorInfo.IME_ACTION_DONE) {
usuario = et1.getText().toString();
if (usuario.trim().length() > 0) {
startActivity2();
} else {
Toast.makeText(getApplicationContext(), " Please add User name", Toast.LENGTH_LONG).show();
}
return true;
}
return false;
}
});
public void startActivity2() {
Intent myIntent = new Intent(this, MainActivity2.class);
startActivity(myIntent);
}}
I am developing an Android app consisting of two activites so far. The first activity (MainActivity) is started when the app is launched or when a QR code is scanned. The MainActivity starts the second activity (NFCActivity) when the user presses a button. The NFCActivity waits for the user to tap a NFC token, reads out data from the token, and returns the read data to the MainActivity.
This works fine if the app is started manually. If the app is started by scanning a QR code, taping the NFC tag does not invoke the NFCActivity's onNewIntent() method as exepcted, but instead creates a new instance of the NFCActivity on top of the already displayed one.
The enableForegroundDispatch() method is called and FLAG_ACTIVITY_SINGLE_TOP should be set. Relevant source code of a minimal example is provided below. Any help would be highly appreciated!
MainActivity:
public class MainActivity extends Activity {
private EditText dataRead;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
dataRead = (EditText) findViewById(R.id.data);
final Button readKeyButton = (Button) findViewById(R.id.readNFC);
readKeyButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent keyIntent = new Intent(MainActivity.this,
NFCActivity.class);
keyIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivityForResult(keyIntent, 1);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (requestCode == 1) {
String result = intent.getExtras().getString("resultData");
this.dataRead.setText(result);
}
}
}
Main Activity's GUI:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/readNFC"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="127dp"
android:text="Read NFC Tag" />
<EditText
android:id="#+id/data"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/readNFC"
android:layout_centerHorizontal="true"
android:layout_marginBottom="85dp"
android:ems="10" >
<requestFocus />
</EditText>
</RelativeLayout>
NFCActivity:
public class NFCActivity extends Activity {
private NfcAdapter mAdapter;
private PendingIntent pendingIntent;
private IntentFilter[] mFilters;
private String[][] mTechLists;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.read_nfc);
mAdapter = NfcAdapter.getDefaultAdapter(this);
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
// // Setup an intent filter for all MIME based dispatches
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
try {
ndef.addDataType("*/*");
} catch (MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
IntentFilter td = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
mFilters = new IntentFilter[] { ndef, td };
//
// // Setup a tech list for all NfcF tags
mTechLists = new String[][] { new String[] { NfcV.class.getName(),
NfcF.class.getName(), NfcA.class.getName(),
NfcB.class.getName() } };
}
#Override
public void onResume() {
super.onResume();
if (mAdapter != null)
mAdapter.enableForegroundDispatch(this, pendingIntent, mFilters,
mTechLists);
}
#Override
public void onPause() {
super.onPause();
if (mAdapter != null)
mAdapter.disableForegroundDispatch(this);
}
#Override
public void onNewIntent(Intent intent) {
Log.d("TEST", "onNewIntent() called.");
// READ THE NFC TAG HERE [SKIPPED FOR MINIMAL EXAMPLE]
// Return dummy data for test
Intent result = new Intent();
result.putExtra("resultData", "DUMMY DATA");
setResult(1, result);
finish();
}
}
NFCActivity's GUI:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#303030"
android:paddingLeft="30dp"
android:paddingRight="30dp" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Tap your NFC tag.."
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#FF8811"
android:textSize="30sp"
android:textStyle="bold" />
</RelativeLayout>
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="test.nfcqrtest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.NFC" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="test.nfcqrtest.MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="myapp" android:host="test.org" android:pathPrefix="/testapp" />
</intent-filter>
</activity>
<activity
android:name=".NFCActivity"
android:windowSoftInputMode="stateHidden" android:screenOrientation="portrait" android:launchMode="singleTop">
</activity>
</application>
</manifest>
In case somebody is facing a similar problem: I was finally able to overcome the issue described above by setting the android:launchMode property for the MainActivity to singleInstance.
I have two buttons (start/stop) that when clicked need to have a Toast pop up saying what has happened to the Service. Start = popup of "service has started" and the service actually starts. The service isn't finished and will be grabbing some GPS info later on.
Anyway, none of my Toasts show up and I'm hoping I'm not missing something obvious.
Main (Activity)
public class Main extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button startBtn = (Button) findViewById(R.id.startButton);
startBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startService(new Intent(getBaseContext(), ParseService.class));
}
});
Button stopBtn = (Button) findViewById(R.id.startButton);
stopBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
stopService(new Intent(getBaseContext(), ParseService.class));
}
});
}
}
ParseService
public class ParseService extends Service {
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public int onStartCommand(Intent e, int flags, int startId){
Toast.makeText(this, "Service has Started", Toast.LENGTH_LONG).show();
return START_STICKY;
}
#Override
public void onDestroy(){
super.onDestroy();
Toast.makeText(this, "Service has Stopped", Toast.LENGTH_LONG).show();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textAlignment="center"
tools:context="${packageName}.${activityClass}" >
<Button
android:id="#+id/startButton"
android:layout_width="150dp"
android:layout_height="60dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="92dp"
android:text="Start" />
<Button
android:id="#+id/stopButton"
android:layout_width="150dp"
android:layout_height="60dp"
android:layout_alignLeft="#+id/startButton"
android:layout_below="#+id/startButton"
android:layout_marginTop="74dp"
android:text="Stop" />
</RelativeLayout>
You are supposed to use the Application's Context from a Service and not the Service's Context.
From your Service:
Toast.makeText(getApplicationContext(), // application Context not 'this'
"Service has Started",
Toast.LENGTH_LONG).show();
Alternatively, you could display them from your Activity before you invoke the Service if you wish but I think where you have the calls currently positioned makes more sense and would reduce repetition later on as long as you always want the Toast displayed.
EDIT:
Ok, after making a quick test app I think I found what might be going wrong for you.
Do you have the Service declared in your AndroidManifest.xml??
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.indivisible.testapp">
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name=".toasts.ToastActivity"
android:label="#string/title_activity_toast">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<!-- Define your Service as below.
In my case the path is:
.../TestApp/app/src/main/java/com/indivisible/testapp/toasts/ToastService.java
Android Studio has a nice auto-complete when you press '.'
-->
<service
android:name=".toasts.ToastService"
android:label="ToastService">
</service>
</application>
</manifest>
It seems like your service is not getting started, make sure the service is declared in the manifest and enabled as below:
<service
android:name=".ParseService"
android:enabled="true" />
Hope this helps
It doesnt have any errors ..when i run on my emulator it UNFORTUNATELY STOPS
i am trying to make my button when i click it takes me to the next page....kindly help!
Here is codes for MyActivity.java
package com.example.INIKO_EVENTS;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
Button login;
Button sign_up;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
login=(Button)findViewById(R.id.Button15);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this,HomeActivity.class);
MyActivity.this.
startActivity(i);
}
});
sign_up=(Button)findViewById(R.id.signUpButton);
sign_up.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MyActivity.this,SignUpActivity.class);
MyActivity.this.
startActivity(i);
}
});
}
}
and heres my HomeActivity.java - it has buttons linking to other pages
package com.example.INIKO_EVENTS;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class HomeActivity extends Activity {
/**
* Created by eddie kamau on 2/14/14.
*/
Button button2;
Button button3;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
button2 = (Button)findViewById(R.id.toEventButton);
button2.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View arg0) {
Intent i = new Intent(HomeActivity.this,EventActivity.class);
HomeActivity.this.
startActivity(i);
}
});
button3=(Button)findViewById(R.id.manage_your_guestButton2);
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Intent i = new Intent(HomeActivity.this,GuestActivity.class);
HomeActivity.this.
startActivity(i);
}
});
}
}
main.xml
<Button
android:layout_width="141dp"
android:layout_height="wrap_content"
android:text="#string/login"
android:layout_margin="10sp"
android:id="#+id/Button15"
android:layout_gravity="center_horizontal"
android:clickable="true"
android:onClick="onClick"/>
<Button
android:layout_width="121dp"
android:layout_height="wrap_content"
android:text="#string/sign_up"
android:id="#+id/signUpButton"
android:layout_gravity="center_horizontal"
android:maxWidth="600dp"
android:clickable="true"
android:onClick="onClick"/>
</LinearLayout>
home.xml
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/create_your_event"
android:id="#+id/toEventButton"
android:layout_gravity="center_horizontal"
android:clickable="true"
android:onClick="onClick"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/manage_your_event"
android:id="#+id/manage_your_guestButton2"
android:layout_gravity="center_horizontal" android:clickable="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/your_events"
android:id="#+id/your_eventsButton3"
android:layout_gravity="center_horizontal" android:clickable="true"/>
</LinearLayout>
try this
mainactivity.java
public class MainActivity extends Activity {
Button login;
Button sign_up;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
login=(Button)findViewById(R.id.button1);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,HomeActivity.class);
startActivity(i);
}
});
sign_up=(Button)findViewById(R.id.button2);
sign_up.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,HomeActivity.class);
startActivity(i);
}
});
}
}
homeactivity.java
public class HomeActivity extends Activity{
Button button2;
Button button3;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
button2 = (Button)findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View arg0) {
Intent i = new Intent(HomeActivity.this,EventActivity.class);
HomeActivity.this.
startActivity(i);
}
});
button3=(Button)findViewById(R.id.button3);
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Intent i = new Intent(HomeActivity.this,GuestActivity.class);
HomeActivity.this.
startActivity(i);
}
});
}
}
manifest.xml
define all this class in mainfest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.target"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.target.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.target.EventActivity" >
</activity>
<activity android:name="com.example.target.GuestActivity" >
</activity>
<activity android:name="com.example.target.HomeActivity" >
</activity>
</application>
I am new to Android and exploring it at the moment.
I have two Image Buttons which have to load different activities onClick.
ImageButton btn1= (ImageButton)findViewById(R.id.timetable);
btn1.setOnClickListener(btnListener1);
ImageButton btn2= (ImageButton)findViewById(R.id.location);
btn2.setOnClickListener(btnListener2);
private OnClickListener btnListener1 = new OnClickListener()
{
public void onClick(View view)
{
Intent myIntent = new Intent(getBaseContext(), HelloWorld1.class);
startActivity(myIntent);
}
};
private OnClickListener btnListener2 = new OnClickListener()
{
public void onClick(View view)
{
Intent myIntent2 = new Intent(getBaseContext(), HelloWorld2.class);
startActivity(myIntent2);
}
};
//my manifest ......
<activity android:name="myApp" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".HelloWorld1"></activity>
<activity android:name=".HelloWorld2"></activity>
//and my main.xml
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="#+id/widget34"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#ffffff"
>
<GridView
android:id="#+id/widget36"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numColumns="2"
android:layout_x="110px"
android:layout_y="32px"
android:layout_centerInParent="true">
</GridView>
<ImageButton
android:id="#+id/timetable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="210px"
android:layout_y="142px"
android:background="#drawable/icon2">
</ImageButton>
<ImageButton
android:id="#+id/location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="100px"
android:layout_y="342px"
android:background="#drawable/icon">
</ImageButton>
This code causes errors, could anyone point where I am going wrong please.
Many thanks in advance.
Let's put aside the finish() method since i dont know what the heck it's doing there :)
Case1: Look careful at your activity xml view file, you might accidentally define your button as Button instead of ImageButton -> Error
Case2: dont use view.getContext(), instead use getBaseContext() or getApplicationContext()
You are calling startActivityForResult() and then immediately calling finish(). Where is the result going to go if the activity is finished?
What behavior do you want and what are you getting instead. The more specific you can be, the better the quality of help you will get.
Try to write something simillar like code below. You can also define first function which will create new activity when button will be pressed.
public class HelloAndroid extends Activity {
private Button button_1;
private Button button_2;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initialiyeFields();
}
private void initialiyeFields(){
button_1 = (Button)findViewById(R.id.button1);
button_1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(HelloAndroid.this, HelloWord1.class);
startActivity(intent);
}
});
button_2 = (Button)findViewById(R.id.button2);
button_2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(HelloAndroid.this, HelloWord2.class);
startActivity(intent);
}
});
}
}