Why do I get a ClassCastException? - java

I am getting a ClassCastException on running this simple application.
I'm trying to use the AlarmManager for the first time.
public class AlarmReciever extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
try {
Bundle bundle = intent.getExtras();
String message = bundle.getString("alarm_message");
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}
this is my manisfest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tcs.mine"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".AlarmReciever"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:process=":remote" android:name=".AlarmReceiver"></receiver>
</application>
</manifest>
What am I doing wrong?


AlarmReceiver is not an Activity but declared as one. Check the documentation on BroadcastReceiver and how to declare them in the manifest file. Maybe you want to check this tutorial


The package statement is missing at the top of your java class.
Besides, check how the AlarmReceiver is spelled throughout your .java and .xml files. Somewhere is called AlarmReciever.

Related

Running code on boot android

I'm having issues getting code to run on boot, I've downloaded the source for an example that should work, but it doesn't. according to the example, it should produce a toast when the phones turned on, but it doesn't happen, I've tested on android 6.0 and 7.0.
any help is appreciated thanks.
The code is as follows:
Manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidautostartup"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" >
</uses-permission>
<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" >
<receiver
android:name=".BootComplete"
android:enabled="true"
android:exported="false" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<service android:name=".AutoStartUp" >
</service>
<activity
android:name="com.example.androidautostartup.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>
</application>
</manifest>
BootComplete.java
public class BootComplete extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equalsIgnoreCase(Intent.ACTION_BOOT_COMPLETED)) {
Intent serviceIntent = new Intent(context, AutoStartUp.class);
context.startService(serviceIntent);
}
}
}
AutoStartUp.java
public class AutoStartUp extends Service {
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
// do something when the service is created
}
}

I really wouldn't recommend doing UI stuff on a worker thread (service). While it can be done, it generates confusion for the user to receive a message outside an app context.
Having said that, if you need to do this you should be running UI code on the UI thread.
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
#Override
public void run() {
Toast.makeText(getContext(), "Service Started", Toast.LENGTH_LONG).show();
}
});

Change page via BroadcastReceiver does not work

I am trying to make a second page show up via a BroadcastReceiver, but the App keeps crashing and I don't know why.
This might be a problem of the correct context.
public class ScreenReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
Log.v("$$$$$", "In Method: ACTION_SCREEN_OFF");
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
Log.v("$$$$$", "In Method: ACTION_SCREEN_ON");
changeActivity(context);
} else if (intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {
Log.v("$$$$$", "In Method: USER_PRESENT");
}
}
public void changeActivity(Context context) {
Intent intent = new Intent(context, Second_Page.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
context.startActivity(intent);
}
}
My Manifest. In there I declare the class that the log file states is missing:
<uses-sdk android:minSdkVersion="14" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name=".CatchUnlockActivity"
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="second_page" >
</activity>
</application>
</manifest>

Found the solution:
The declaration of the classes is case-sensitive!
Changed every occurrence from "second_page" to "Second_Page" and now it works.

Launching an application at start-up

I want my application to be automatically launched when the system is started. Can anyone tell me how to do that?
Thanks in advance for the time you will spend trying to help me.

First, you need the permission in your manifest:
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
Also, in your manifest, define your service and listen for the boot-completed action:
<service android:name=".MyService" android:label="My Service">
<intent-filter>
<action android:name="com.myapp.MyService" />
</intent-filter>
</service>
<receiver
android:name=".receiver.StartMyServiceAtBootReceiver"
android:enabled="true"
android:exported="true"
android:label="StartMyServiceAtBootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
Then you need to define the receiver that will get the BOOT_COMPLETED action and start your service.
public class StartMyServiceAtBootReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {
Intent serviceIntent = new Intent("com.myapp.MySystemService");
context.startService(serviceIntent);
}
}
}
And now your service should be running when the phone starts up.

Here is Complete working Example Code,
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.practice" android:versionCode="1" android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".AutoStartExampleActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="AutoStart"></receiver>
<receiver android:name=".AutoStart">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
</manifest>
AutoStartExampleActivity File
package com.practice;
import android.app.Activity;
import android.os.Bundle;
public class AutoStartExampleActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
BroadcastReceiver Code,
package com.practice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class AutoStart extends BroadcastReceiver
{
public void onReceive(Context context, Intent intent)
{
System.out.println ( "Application Started" );
// put your TimerTask calling class here
try
{
Intent myIntent = new Intent ( context, AutoStartExampleActivity.class );
myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(myIntent);
}
catch ( Exception e )
{
System.out.println ( " Error while Starting Activity " + e.toString() );
}
}
}

Android : BroadcastReceiver SMS_RECEIVED

I'm trying to use a BroadcastReceiver for the action in the title.
I've created 2 class :
1) An Activity that register my BroadcastReceiver.
2) A class that extended BroadcastReceiver and override the onReceive method.
The Manifest does not contain any error apparently, so i decide to post it here, with the two class also.
Thanks for the attention.
P.S = I'm not english, so sorry if my questions have any grammar mistakes ;)
public class SMSBroadcastReceiver extends BroadcastReceiver {
private static final String TAG = "SMSBroadcastReceiver";
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equalsIgnoreCase("SMS_RECEIVED")){
Log.d(TAG, "Un messaggio ricevuto");
Toast.makeText(context, "Un messaggio ricevuto", Toast.LENGTH_LONG).show();
}
}
}
public class SMSyncHome extends Activity {
private SMSBroadcastReceiver SMSreceiver;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SMSreceiver = new SMSBroadcastReceiver();
registerReceiver(SMSreceiver, new IntentFilter("android.provider.Telephony.SMS_RECEIVED"));
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.contervis.SMSync"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity android:name=".SMSyncHome"
android:label="#string/app_name">
<intent-filter >
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiver android:name=".SMSBroadcastReceiver" android:enabled="true">
<intent-filter >
<action android:name="android.provider.Telephony.SMS_RECEIVED"/>
</intent-filter>
</receiver>
</application>
</manifest>

The action that you match in your BroadcastReceiver should be android.provider.Telephony.SMS_RECEIVED, not just the last part.

Android - Start service on boot

From everything I've seen on Stack Exchange and elsewhere, I have everything set up correctly to start an IntentService when Android OS boots. Unfortunately it is not starting on boot, and I'm not getting any errors. Maybe the experts can help...
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.phx.batterylogger"
android:versionCode="1"
android:versionName="1.0"
android:installLocation="internalOnly">
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.BATTERY_STATS" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<service android:name=".BatteryLogger"/>
<receiver android:name=".StartupIntentReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
</manifest>
BroadcastReceiver for Startup:
package com.phx.batterylogger;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class StartupIntentReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent serviceIntent = new Intent(context, BatteryLogger.class);
context.startService(serviceIntent);
}
}
UPDATE: I tried just about all of the suggestions below, and I added logging such as Log.v("BatteryLogger", "Got to onReceive, about to start service"); to the onReceive handler of the StartupIntentReceiver, and nothing is ever logged. So it isn't even making it to the BroadcastReceiver.
I think I'm deploying the APK and testing correctly, just running Debug in Eclipse and the console says it successfully installs it to my Xoom tablet at \BatteryLogger\bin\BatteryLogger.apk. Then to test, I reboot the tablet and then look at the logs in DDMS and check the Running Services in the OS settings. Does this all sound correct, or am I missing something? Again, any help is much appreciated.

Well here is a complete example of an AutoStart Application
AndroidManifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="pack.saltriver" android:versionCode="1" android:versionName="1.0">
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<receiver android:name=".autostart">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<activity android:name=".hello"></activity>
<service android:enabled="true" android:name=".service" />
</application>
</manifest>
autostart.java
public class autostart extends BroadcastReceiver
{
public void onReceive(Context context, Intent arg1)
{
Intent intent = new Intent(context,service.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(intent);
} else {
context.startService(intent);
}
Log.i("Autostart", "started");
}
}
service.java
public class service extends Service
{
private static final String TAG = "MyService";
#Override
public IBinder onBind(Intent intent) {
return null;
}
public void onDestroy() {
Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG).show();
Log.d(TAG, "onDestroy");
}
#Override
public void onStart(Intent intent, int startid)
{
Intent intents = new Intent(getBaseContext(),hello.class);
intents.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intents);
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
Log.d(TAG, "onStart");
}
}
hello.java - This will pop-up everytime you start the device after executing the Applicaton once.
public class hello extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Toast.makeText(getBaseContext(), "Hello........", Toast.LENGTH_LONG).show();
}
}

Following should work. I have verified. May be your problem is somewhere else.
Receiver:
public class MyReceiver extends BroadcastReceiver{
#Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_BOOT_COMPLETED.equals(arg1.getAction())) {
Log.d("TAG", "MyReceiver");
Intent serviceIntent = new Intent(context, Test1Service.class);
context.startService(serviceIntent);
}
}
}
Service:
public class Test1Service extends Service {
/** Called when the activity is first created. */
#Override
public void onCreate() {
super.onCreate();
Log.d("TAG", "Service created.");
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("TAG", "Service started.");
return super.onStartCommand(intent, flags, startId);
}
#Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.d("TAG", "Service started.");
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
}
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test"
android:versionCode="1"
android:versionName="1.0"
android:installLocation="internalOnly">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.BATTERY_STATS"
/>
<!-- <activity android:name=".MyActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"></category>
</intent-filter>
</activity> -->
<service android:name=".Test1Service"
android:label="#string/app_name"
>
</service>
<receiver android:name=".MyReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
</manifest>

Your Service may be getting shut down before it completes due to the device going to sleep after booting. You need to obtain a wake lock first. Luckily, the Support library gives us a class to do this:
public class SimpleWakefulReceiver extends WakefulBroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
// This is the Intent to deliver to our service.
Intent service = new Intent(context, SimpleWakefulService.class);
// Start the service, keeping the device awake while it is launching.
Log.i("SimpleWakefulReceiver", "Starting service # " + SystemClock.elapsedRealtime());
startWakefulService(context, service);
}
}
then, in your Service, make sure to release the wake lock:
#Override
protected void onHandleIntent(Intent intent) {
// At this point SimpleWakefulReceiver is still holding a wake lock
// for us. We can do whatever we need to here and then tell it that
// it can release the wakelock.
...
Log.i("SimpleWakefulReceiver", "Completed service # " + SystemClock.elapsedRealtime());
SimpleWakefulReceiver.completeWakefulIntent(intent);
}
Don't forget to add the WAKE_LOCK permission:
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

I have found a way to make your application run well when the device reboots, please follow the steps below to be successful.
AndroidManifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="pack.saltriver" android:versionCode="1" android:versionName="1.0">
<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".UIBootReceiver" android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
<service android:name=".class_Service" />
</application>
</manifest>
UIBootReceiver
public class UIBootReceiver extends BroadcastReceiver {
private static final String TAG = "UIBootReceiver";
#Override
public void onReceive(Context context, Intent arg1)
{
Toast.makeText(context, "started", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context,class_Service.class);
context.startService(intent);
}
}
This is asking permission to not need to manage battery saving for this app so you can run in the background stably.
Declare this code in onCreate () of MainActivity class:
Intent myIntent = new Intent();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
myIntent.setAction(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);
myIntent.setData(Uri.parse("package:" +
DeviceMovingSpeed.this.getPackageName()));
}
startActivity(myIntent);

Looks very similar to mine but I use the full package name for the receiver:
<receiver android:name=".StartupIntentReceiver">
I have:
<receiver android:name="com.your.package.AutoStart">

I've had success without the full package, do you know where the call chain is getting interrupted? If you debug with Log()'s, at what point does it no longer work?
I think it may be in your IntentService, this all looks fine.

Just to make searching easier, as mentioned in comments, this is not possible since 3.1
https://stackoverflow.com/a/19856367/6505257

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