在一个应用程序（App1）中，我正在广播一条消息。下面的代码是正确的 -> 如果我尝试在同一项目中获取广播，则会检测到广播。
sendBroadcast(new Intent("com.example.MESSAGE_INTENT").putExtra("MESSAGE", ((EditText) findViewById(R.id.textField)).getText()));
我创建了 App2，它有一个BroadcastReceiver等待广播的Intent但方法onReceive从未被调用。
如何更改BroadcastReceiver应用程序使服务始终在后台运行？
App2清单和代码：
package com.example;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("WORKS" , "!!!!!!!!!!");
Toast.makeText(context, "CAUGHTt\n" + intent.getExtras().getString("MESSAGE"), Toast.LENGTH_LONG).show();
}
}
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jjoe64" >
<permission-group
android:name="com.examples.my_permissions"
android:label="my permissions groupd" />
<permission
android:name="com.examples.my_permissions.MY_PERMISSION"
android:label="my permission"
android:permissionGroup="com.examples.my_permissions" />
<application>
<receiver
android:name="MyReceiver"
android:exported="true"
android:permission="com.examples.my_permissions.MY_PERMISSION" >
<intent-filter>
<action android:name="com.example.MESSAGE_INTENT" />
</intent-filter>
</receiver>
<service android:name="BackgroundService" />
</application>
</manifest>
广播商清单
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example"
android:exported="true" >
<uses-permission android:name="com.examples.my_permissions.MY_PERMISSION" />
<permission-group
android:name="com.examples.my_permissions"
android:label="my permissions groupd" />
<permission
android:name="com.examples.my_permissions.MY_PERMISSION"
android:label="my permission"
android:permissionGroup="com.examples.my_permissions" />
<application>
<receiver
android:name="com.example.MyReceiver"
android:exported="true"
android:permission="com.examples.my_permissions.MY_PERMISSION" >
<intent-filter>
<action android:name="com.example.MESSAGE_INTENT" />
<action android:name="android.intent.action.AIRPLANE_MODE" />
</intent-filter>
</receiver>
</application>
</manifest>
主要编辑
我创建了另一个应用程序MainActivity我在那里创造了final BroadcastReceiver:
CODE:
package com.example.receiver2;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
final BroadcastReceiver br = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("WORKS" , "!!!!!!!!!!");
Toast.makeText(context, "CAUGHTt\n" + intent.getExtras().getString("MESSAGE"), Toast.LENGTH_LONG).show();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
显现：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.receiver2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="com.examples.my_permissions.MY_PERMISSION" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<permission-group
android:name="com.examples.my_permissions"
android:label="my permissions groupd" />
<permission
android:name="com.examples.my_permissions.MY_PERMISSION"
android:label="my permission"
android:permissionGroup="com.examples.my_permissions" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver
android:name="com.example.MyReceiver"
android:exported="true" >
<intent-filter>
<action android:name="com.example.MESSAGE_INTENT" />
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<activity
android:name="com.example.receiver2.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>
但我有一个例外：
04-18 10:16:46.332: E/AndroidRuntime(1244): FATAL EXCEPTION: main
04-18 10:16:46.332: E/AndroidRuntime(1244): Process: com.example.receiver2, PID: 1244
04-18 10:16:46.332: E/AndroidRuntime(1244): java.lang.RuntimeException: Unable to instantiate receiver com.example.MyReceiver: java.lang.ClassNotFoundException: Didn't find class "com.example.MyReceiver" on path: DexPathList[[zip file "/data/app/com.example.receiver2-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.receiver2-1, /system/lib]]
04-18 10:16:46.332: E/AndroidRuntime(1244): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2400)
