Broadcast组件——收发广播应用——收发静态广播

Dear 丶 2023-09-28 16:25 23阅读 0赞

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布局：

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代码：

package com.example.myapplication;
    
    import android.content.ComponentName;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Toast;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import com.example.myapplication.receiver.ShockReceiver;
    
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            findViewById(R.id.btn_send_shock).setOnClickListener(this);
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_send_shock)
            {
                // Android8.0之后删除了大部分静态注册，防止退出App后仍在接收广播，
                // 为了让应用能够继续接收静态广播，需要给静态注册的广播指定包名。
                String receiverPath = "com.example.myapplication.receiver.ShockReceiver";
    
                Intent intent = new Intent(ShockReceiver.SHOCK_ACTION); // 创建一个指定动作的意图
    
                // 发送静态广播之时，需要通过setComponent方法指定接收器的完整路径
                ComponentName componentName  = new ComponentName(this, receiverPath);
    
                intent.setComponent(componentName); // 设置意图的组件信息
    
                sendBroadcast(intent); // 发送静态广播
    
                Toast.makeText(this, "已发送震动广播", Toast.LENGTH_SHORT).show();
            }
        }
    }

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ShockReceiver：

package com.example.myapplication.receiver;
    
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.os.Vibrator;
    import android.util.Log;
    
    public class ShockReceiver extends BroadcastReceiver
    {
        private static final String TAG = "ShockReceiver";
    
        // 静态注册时候的action、发送广播时的action、接收广播时的action，三者需要保持一致
        public static final String SHOCK_ACTION = "com.example.myapplication.receiver.ShockReceiver";
    
    
        @Override
        public void onReceive(Context context, Intent intent)
        {
            Log.d(TAG, "onReceive");
            if (intent.getAction().equals(ShockReceiver.SHOCK_ACTION))
            {
                // 从系统服务中获取震动管理器
                Vibrator vb = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
                
                vb.vibrate(500); // 命令震动器吱吱个若干秒，这里的500表示500毫秒
            }
        }
    
    }

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mainifest.xml：

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.myapplication">
    
        <uses-permission android:name="android.permission.VIBRATE" />
    
    
        <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/Theme.MyApplication">
            <activity
                android:name=".MainActivity"
                android:exported="true">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
    
            <receiver
                android:name=".receiver.ShockReceiver"
                android:enabled="true"
                android:exported="true">
                <intent-filter>
                    <action android:name="com.example.myapplication.receiver.ShockReceiver" />
                </intent-filter>
            </receiver>
    
        </application>
    
    </manifest>

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