广播接收器无法正常工作-为什么如此?

时间:2019-04-10 11:02:50

标签: android static broadcastreceiver

我正在学习Android。 我尝试实现自定义静态广播接收器,但无法正常工作。 我从Google搜索一些问题,但是找不到解决该问题的方法。 我在Android 7.0最低级别24目标级别28上工作

实际上,当我启动Activity时,MyStaticReceiver没有启动(无日志) MyDynamicReceiver完美运行

您有解决方案吗?

AndroidManifest.xml:

            if (this.WindowState == FormWindowState.Normal)
            {
                ucChat.FlowChat.Size = new Size(323, 276);
                ucChat.FlowChat.Left = (ucChat.ClientSize.Width - ucChat.FlowChat.Width) / 2;
                ucChat.FlowChat.Anchor = (AnchorStyles.Bottom | AnchorStyles.Top | AnchorStyles.Right | AnchorStyles.Left);
            }

MainActivity.java:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="test.receiver">

    <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/AppTheme">

        <activity android:name="test.receiver.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name=".MyStaticReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="@string/StaticAction" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

MyStaticReceiver.java(MyDynamicReceiver是相同的...)

public class MainActivity extends Activity {
    public final static boolean Debug = true;
    public final static String TAG = "TagDebug";

    private MyDynamicReceiver dynamicReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ComponentName receiver = new ComponentName(this, MyStaticReceiver.class);
        PackageManager pm = this.getPackageManager();
        pm.setComponentEnabledSetting(receiver,
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                PackageManager.DONT_KILL_APP);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (Debug) Log.i(TAG, "MainActivity:onResume");
        configureDynamicReceiver();
    }

    @Override
    protected void onDestroy(){
        super.onDestroy();
        if (Debug) Log.i(TAG, "MainActivity:onDestroy");
        unregisterReceiver(dynamicReceiver);
    }

    public void onClickButton(View v) {
        if (Debug) Log.i(TAG, "MainActivity:onClickButton");
        Intent staticIntent = new Intent();
        staticIntent.setAction(getString(R.string.StaticAction));
        sendBroadcast(staticIntent);

        Intent dynamicIntent = new Intent();
        dynamicIntent.setAction(getString(R.string.DynamicAction));
        sendBroadcast(dynamicIntent);
    }

    public void configureDynamicReceiver() {
        if( dynamicReceiver == null ) {
            dynamicReceiver = new MyDynamicReceiver();
        }
        IntentFilter filter = new IntentFilter(getString(R.string.DynamicAction));
        registerReceiver(dynamicReceiver, filter);
    }
}

1 个答案:

答案 0 :(得分:1)

您实际上是在发送隐式广播,因此清单中声明的​​接收器将不起作用。

  

如果您的应用定位到Android 8.0(API级别26)或更高版本,则不能使用清单   声明大多数隐式广播的接收方(   (不专门针对您的应用)。您仍然可以使用   用户正在积极使用您的应用程序时,在上下文中注册的接收者。 Link

MyDynamicReceiver不会遇到任何问题,因为它是上下文注册的接收者。

但是要使其适用于MyStaticReceiver,您可以尝试通过在Intent的构造函数中传递组件名称来发送显式广播

Intent staticIntent = new Intent(this, MyStaticReceiver.class);
staticIntent.setAction(getString(R.string.StaticAction));
sendBroadcast(staticIntent);