Question

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。

Answer 1

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);

Answer 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

Answer 3

MyReceiver是类而不是对象。创建

myReceiver = new MyReceiver();

并放...........

registerReceiver(myReceiver,intentFilter);

Answer 4

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();

            }

            }
       }

Answer 5

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);
    }
}

Answer 6

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);

Answer 7

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）

如何将BroadCast从一个应用程序发送到另一个应用程序

7 个答案: