我有App A和App B.在App A中我想向App B发送广播。 这是App A的代码：
final Intent intent = new Intent();
intent.setAction("com.pkg.perform.Ruby");
intent.putExtra("KeyName", "code1id");
intent.setComponent(new ComponentName("com.pkg.AppB", "com.pkg.AppB.MainActivity"));
sendBroadcast(intent);
在应用B中 - 在MainActivity中，我有MyBroadCastReceiver类。
public class MainActivity extends Activity {
private MyBroadcastReceiver MyReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Receive broadcast from External App
IntentFilter intentFilter = new IntentFilter("com.pkg.perform.Ruby");
MyReceiver = new MyBroadcastReceiver();
if(intentFilter != null)
{
registerReceiver(MyReceiver, intentFilter);
}
}
public class MyBroadcastReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(MainActivity.this, "Data Received from External App", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(MyReceiver != null)
unregisterReceiver(MyReceiver);
}
}
我收到错误 - Receiver未注册。
答案 0 :(得分：41)
首先，首先在清单文件中的app B中声明接收器，如下所示：
<receiver android:name=".MyBroadcastReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.pkg.perform.Ruby" />
</intent-filter>
</receiver>
向广告 [src]发送广播添加FLAG_INCLUDE_STOPPED_PACKAGES标志时，因为当您从应用A广播到应用B时，应用B可能没有正在运行，此标志可确保广播覆盖甚至应用没跑：
FLAG_INCLUDE_STOPPED_PACKAGES标志被添加到之前的意图中 被发送以表明允许意图开始 已停止的应用程序的组件。
intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
在你的情况下，它将是这样的：
final Intent intent=new Intent();
intent.setAction("com.pkg.perform.Ruby");
intent.putExtra("KeyName","code1id");
intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
intent.setComponent(
new ComponentName("com.pkg.AppB","com.pkg.AppB.MyBroadcastReceiver"));
sendBroadcast(intent);
答案 1 :(得分：2)
可能有两种情况：
- 您的appB未运行，因此活动未实例化，因此接收方未注册。
- 您的活动已被销毁，意味着您已取消注册您通过onCreate（）
中的registerReceiver（）注册的接收者
解决方案：
在清单中注册您的广播接收器。
appB的内部清单：
<receiver android:name=".MyBroadcastReceiver">
<intent-filter>
<action android:name="com.pkg.perform.Ruby" />
</intent-filter>
</receiver>
并在appA中注释掉该行
intent.setComponent(new ComponentName("com.pkg.AppB","com.pkg.AppB.MainActivity"));
在MyBroadcastReceiver中编写逻辑以显示相关数据/启动新活动
答案 2 :(得分：0)
MyReceiver是类而不是对象。创建
myReceiver = new MyReceiver();
并放...........
registerReceiver(myReceiver,intentFilter);
答案 3 :(得分：0)
如果这对某人有帮助，并且对我有用
在活动中的App A中或在内容提供商中-
Intent intent = new Intent("Updated");
intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
intent.setComponent (new
ComponentName "com.exam.appA",
"com.exam.appA.DbaseChanged"));
getContext().sendBroadcast(intent);
在清单B中的应用B中
<receiver
android:name=".DbaseChanged"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="Updated" />
</intent-filter>
</receiver>
在应用B中，广播接收器类别-
public class DbaseChanged extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent
intent) {
String act = intent.getAction();
if(act != null && act.equals("Updated") )
{
Toast.makeText(context, act ,
Toast.LENGTH_SHORT).show();
}
}
}
答案 4 :(得分：0)
在应用A中：在此处发送广播。
final Intent i= new Intent();
i.putExtra("data", "Some data");
i.setAction("com.pkg.perform.Ruby");
i.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
getApplicationContext().sendBroadcast(i);
在应用B清单中
<receiver android:name=".MyBroadcastReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.pkg.perform.Ruby" />
</intent-filter>
</receiver>
在App B MainActivity中：注册接收者oncreate（），然后取消注册onDestroy（）
public class MainActivity extends AppCompatActivity
{
private MyBroadcastReceiver MyReceiver;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyReceiver = new MyBroadcastReceiver();
IntentFilter intentFilter = new IntentFilter("com.pkg.perform.Ruby");
if(intentFilter != null)
{
registerReceiver(MyReceiver, intentFilter);
}
@Override
protected void onDestroy()
{
super.onDestroy();
if(MyReceiver != null)
unregisterReceiver(MyReceiver);
}}
在应用B中的BroadcastReceiver
public class MyBroadcastReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
String data = intent.getStringExtra("data");
Log.i("BR" ,"Data received: " + data);
}
}
答案 5 :(得分：0)
在Android 9（API级别28）中，我只需要在代码中定义BroadcastReceiver即可。
就像这样（在我的情况下，添加到服务中-没关系）
private MyReceiver myReceiver;
@Override
public void onCreate() {
myReceiver = new MyReceiver();
this.registerReceiver(myReceiver, new IntentFilter("android.intent.action.myreceiver"));
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(myReceiver);
}
private class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
try {
if (intent.getAction().equals("android.intent.action.myreceiver")) {
//logic goes here
}
} catch (Exception e) {
//some log goes here
}
}
}
像这样发送广播
Intent intentMy = new Intent();
intentMy.setAction("android.intent.action.myreceiver");
intentMy.putExtra("whatever", true);
sendBroadcast(intentMy);
答案 6 :(得分：0)
在清单中注册广播接收器时，我需要致电setPackage("package_name")以确保明确。这样，即使应用程序完全关闭，我也可以接收数据。
// sending app sends broadcast
Intent intent = new Intent(ACTION_RECOMMEND);
intent.putExtra(LISTEN_RECOMMENDATION, "Triggered - Jhene Aiko");
intent.putExtra(WATCH_RECOMMENDATION, "Goblin - Kim Go-eun");
intent.setPackage("com.example.package.receiverapp");
sendBroadcast(intent);
//receiving app manifest registers receiver
<receiver
android:name=".ManifestRegisteredBroadcastReceiver"
android:exported="true">
<intent-filter>
<action android:name="com.random.action.RECOMMEND" />
</intent-filter>
</receiver>
通过活动注册接收方时，我不需要添加intent.setPackage(package_name)，但这也意味着如果活动被破坏（长时间关闭应用程序，后台运行应用程序），我将无法获取数据）