Android BroadcastReceiver廣播簡單使用

public class MyReceiver extends BroadcastReceiver {
    @Override
    //接受廣播時回調
    public void onReceive(Context context, Intent intent) {
        //接收廣播
      if(intent != null){
          //接收到是什麼廣播
          String action = intent.getAction();
          Log.e("測試",action);
      }
    }
}

<receiver android:name=".MyReceiver">
            <!--接受廣播類型-->
            <intent-filter>
                <!--開機廣播-->
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
                <!--電量低廣播-->
                <action android:name="android.intent.action.BATTERY_LOW"/>
                <!--應用卸載-->
                <action android:name="android.intent.action.PACKAGE_REMOVED"/>
                <!--應用安裝-->
                <action android:name="android.intent.action.PACKAGE_INSTALL"/>
                <!--數據類型-->
                <data android:scheme="package"/>
            </intent-filter>
</receiver>

public class MyReceiverD extends BroadcastReceiver {

    @Override
    //接受廣播時回調(不能做耗時操作，必須開子線程)
    public void onReceive(Context context, Intent intent) {
            //接收廣播
            if(intent != null){
                //接收到是什麼廣播
                String action = intent.getAction();
                Log.e("測試",action);
            }
        }
    }

<!--動態註冊-->
        <receiver android:name=".MyReceiverD">
        //因為是動態設置就不需要在裡面設置別的瞭
</receiver>

//新建一個廣播接收器 動態廣播
        receiverD = new MyReceiverD();
        //接收那種廣播
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        intentFilter.addDataScheme("package");
        intentFilter.addAction(Intent.ACTION_BATTERY_LOW);
        //註冊廣播接收器
        registerReceiver(receiverD,intentFilter);

        protected void onDestroy() {
        super.onDestroy();
        //取消註冊關閉接收器
        if (receiverD != null){
            unregisterReceiver(receiverD);
        }
    }

public class MyReceiverD_zdy extends BroadcastReceiver {
    private TextView txt;
    public MyReceiverD_zdy(TextView txt) {
        this.txt = txt;
    }
    public MyReceiverD_zdy() {

    }

    @Override
    public void onReceive(Context context, Intent intent) {
        //接收廣播
        if(intent != null){
            //接收到是什麼廣播
            String action = intent.getAction();
            Log.e("測試",action);
            //判斷是什麼廣播，是否是自己自定義的廣播
            if (TextUtils.equals(action,MainActivity.MY_ACTION)){
                //獲取廣播攜帶的數據
                String content = intent.getStringExtra(MainActivity.BROADCAST_CONTENT);
               if (txt != null){
               txt.setText("接收到的action是:"+action+"\n接收到的內容是"+content);
               }
            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:padding="16dp"
    >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="請輸入發送內容："/>

    <EditText
        android:id="@+id/etxt"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginTop="16dp"
        />

    <Button
        android:id="@+id/bnt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_gravity="center_horizontal"
        android:text="發送廣播"/>

    <TextView
        android:id="@+id/txt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="收到的內容："/>

</LinearLayout>

public class MainActivity extends AppCompatActivity {
    private MyReceiverD receiverD;
    private MyReceiverD_zdy receiverDZdy;
    private Button bnt;
    private EditText etxt;
    private TextView txt;
    public static final String MY_ACTION = "com.example.my";
    public static final String BROADCAST_CONTENT = "cs";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        
        //設置應用主頁面的標題
        setTitle(getPackageName());
       //新建廣播接收器
        receiverDZdy = new MyReceiverD_zdy(txt);
        //註冊廣播接收器

        //為廣播添加Action
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.intent.action,PACKAGE_REMOVED");
        //自定義
        intentFilter.addAction(MY_ACTION);
        //註冊廣播接收器
        registerReceiver(receiverDZdy,intentFilter);
        bnt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //新建廣播 自定義
                Intent intent = new Intent(MY_ACTION);
                //攜帶數據
                intent.putExtra(BROADCAST_CONTENT,etxt.getText().toString());

                //發送廣播
                sendBroadcast(intent);
            }
        });
    }
    protected void onDestroy() {
        super.onDestroy();
        //取消註冊關閉接收器
        if (receiverDZdy != null){
            unregisterReceiver(receiverDZdy);
        }
    }

    private void initView() {
        //初始化
        etxt = (EditText) findViewById(R.id.etxt);
        txt =(TextView) findViewById(R.id.txt);
        bnt =(Button) findViewById(R.id.bnt);
    }
}