android - 如何使用自定义权限向其他APP发送OrderedBroadcast？

Question

我的要求是，我想从一个应用程序通过广播通知另一个应用程序一些事件，但我不希望其他应用程序也收到广播。所以我认为 sendOrderedBroadcast with permission 是一个很好的解决方案。

然后我的测试看起来像这样:

BCSender APP:
定义自定义权限，并使用该权限发送广播:

<permission 
    android:protectionLevel="normal"
    android:name="com.czou.permission.BC" />

BCSender 中唯一的 Activity :

package com.example.bcsender;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity {

    private static String BC_PERMISSION = "com.czou.permission.BC";

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

        sendBroadcast();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    private void sendBroadcast()
    {
        Intent intent = new Intent("android.intent.action.czou_broadcast");
        intent.putExtra("msg", "hello from czou");
        sendOrderedBroadcast(intent, BC_PERMISSION);
        //sendBroadcast(intent, BC_PERMISSION);
    }    
}

BCReceiverA APP:
声明BCSender APP中定义的权限并注册广播接收器:

<user-permission android:name="com.czou.permission.BC" />

BCReceiverA 中唯一的 Activity :

package com.example.bcreceivera;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity {        
    private static String TAG = "BCReceiverA";

    private BroadcastReceiver mReceiver = null;

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

        registerReceiver();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    @Override
    public void onDestroy()
    {
        super.onDestroy();

        unregisterReceiver();
    }

    private void registerReceiver()
    {
        android.util.Log.d(TAG, "register receiver.");
        mReceiver = new BroadcastReceiver() 
        {
            @Override
            public void onReceive(Context context, Intent intent)
            {
                String msg = intent.getStringExtra("msg");
                android.util.Log.d(TAG, "Receive broadcast. " + msg);

                Bundle bundle = new Bundle();
                bundle.putString("msg", msg + "pass through ReceverA");
                setResultExtras(bundle);
                abortBroadcast();
            }
        };

        IntentFilter intentFilter = new IntentFilter("android.intent.action.czou_broadcast");
        intentFilter.setPriority(1000);
        this.registerReceiver(mReceiver, intentFilter);


    }

    private void unregisterReceiver()
    {
        android.util.Log.d(TAG, "unregister receiver.");
        this.unregisterReceiver(mReceiver);     
    }    
}

可以发现，在BCSender中，我使用了sendOrderedBroadcast(intent, BC_PERMISSION)，结果是BCReceiverA收不到广播，sendBroadcast(intent, BC_PERMISSION)也收不到。但是如果我使用sendBroadcast(intent)，接收者可以得到它。

那么这里的 sendBroadcast()/sendOrderedBroadcast() 有什么问题？

Answer 1

你有 <user-permission> .元素名称应该是 <uses-permission> .

此外，您可能希望声明 <permission>两个应用程序中的元素，因此它们的安装顺序无关紧要。否则，<permission> 必须在<uses-permission>之前安装应用程序应用程序。