BroadcastReceiver未接收广播

Question

我正在尝试使用以下代码扩展来播放Toast消息Activity.但是广播没有被另一个人收到Activity,吐司也没有显示出来.有人可以解决我的错误吗？主要活动是SendBroadcast.java

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

public class SendBroadcast extends Activity {

    public static String BROADCAST_ACTION =
                             "com.unitedcoders.android.broadcasttest.SHOWTOAST";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public void sendBroadcast(View v) {
        Intent broadcast = new Intent();
        broadcast.setAction(BROADCAST_ACTION);
        sendBroadcast(broadcast);
    }
}

Toast Display Activity是ToastDisplay.java

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.widget.Toast;

public class ToastDisplay extends Activity {

    private BroadcastReceiver receiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(getApplicationContext(), "received",
                    Toast.LENGTH_SHORT).show();
        }
    };

    @Override
    protected void onResume() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(SendBroadcast.BROADCAST_ACTION);
        registerReceiver(receiver, filter);
        super.onResume();
    }

    @Override
    protected void onPause() {
        unregisterReceiver(receiver);
        super.onPause();
    }
}

和manifest.xml如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.broad"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk android:minSdkVersion="3" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".SendBroadcast"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".ToastReceiver" >
            <intent-filter>
                <action android:name="com.unitedcoders.android.broadcasttest.SHOWTOAST" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

Answer 1

可以有两种类型的broacast:静态和动态.静态是在清单文件中声明的那些.动态可以在运行时声明.您在一个广播中合并了这两种类型的广播.

要声明一个简单的动态广播,您可以使用以下代码(基于您的代码).它只会在显示活动时显示Toast消息.

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.util.Log;
import android.view.View;
import android.widget.Toast;

public class BroadcastTestActivity extends Activity {

    public static String BROADCAST_ACTION =     
                            "com.unitedcoders.android.broadcasttest.SHOWTOAST";
    BroadcastReceiver br = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.w("Check", "Inside On Receiver");
            Toast.makeText(getApplicationContext(), "received",
                    Toast.LENGTH_SHORT).show();
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        IntentFilter filter = new IntentFilter();
        filter.addAction(BROADCAST_ACTION);
        filter.addCategory(Intent.CATEGORY_DEFAULT);
        registerReceiver(br, filter);
    }

    @Override
    protected void onResume() {
        super.onResume();
        sendBroadcast();
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(br);
    }

    public void sendBroadcast() {
        Intent broadcast = new Intent();
        broadcast.setAction(BROADCAST_ACTION);
        broadcast.addCategory(Intent.CATEGORY_DEFAULT);
        sendBroadcast(broadcast);
    }
}

所以现在不用显示吐司就可以调用你的新活动.以下操作取决于您的需求(您想要做什么).