自定义广播

一、静态注册广播

//自定义类继承姿BroadcastReceiver
//清单文件注册广播
public class My_Recevier extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("com.xxs.666")){
            String data = intent.getStringExtra("data");
            Toast.makeText(context, data, Toast.LENGTH_SHORT).show();
        }
    }

清单文件

<receiver android:name=".My_Recevier">
    <intent-filter>
        <action android:name="com.xxs.666"></action>
    </intent-filter>
</receiver>

发送广播

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = new Intent();
        intent.setAction("com.xxs.666");
        intent.putExtra("data","李狗蛋你家猪跑了");
        sendBroadcast(intent);
    }
});

二、动态注册广播

两个方法
registerReceiver();注册
unregisterReceiver();解除注册

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    text = findViewById(R.id.text);
     my_recevier = new My_Recevier();
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction("com.xxs.777");
    //写registerReceiver（）方法 参数一 自定义接收者 参数二 IntentFilter 添加频道
    registerReceiver(my_recevier,intentFilter);
}
//在activity生命周期结束之后注销注册
@Override
protected void onDestroy() {
    super.onDestroy();
    unregisterReceiver(my_recevier);
}

三、系统广播广播

public class My_Reciver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) {//电量发生改变
            //获取当前电量
            int level = intent.getIntExtra("level", 0);
            Toast.makeText(context, "当前电量: " + level, Toast.LENGTH_SHORT).show();
            Log.d("ytx", "当前电量: " + level);
        } else if (intent.getAction().equals(Intent.ACTION_BATTERY_LOW)) {//低电量
            Toast.makeText(context, "电量低: ", Toast.LENGTH_SHORT).show();
            Log.d("ytx", "电量低: ");
        } else if (intent.getAction().equals(Intent.ACTION_BATTERY_OKAY)) {//电量充足
            Toast.makeText(context, "电量充足: ", Toast.LENGTH_SHORT).show();
            Log.d("ytx", "电量充足: ");
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {//亮屏
            Toast.makeText(context, "亮屏: ", Toast.LENGTH_SHORT).show();
            Log.d("ytx", "亮屏: ");
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {//锁屏
            Toast.makeText(context, "锁屏: ", Toast.LENGTH_SHORT).show();
            Log.d("ytx", "锁屏: ");
        } else if (intent.getAction().equals(Intent.ACTION_AIRPLANE_MODE_CHANGED)) {//飞行
            Bundle extras = intent.getExtras();
            int state = extras.getInt("state");
            if (state == 0) {
                Toast.makeText(context, "飞行关闭: ", Toast.LENGTH_SHORT).show();
            } else if (state == 2) {
                Toast.makeText(context, "飞行打开: ", Toast.LENGTH_SHORT).show();
            }
        }else if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)){//插入耳机
            Toast.makeText(context, "插入耳机: ", Toast.LENGTH_SHORT).show();
        }
    }

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
    intentFilter.addAction(Intent.ACTION_BATTERY_LOW);
    intentFilter.addAction(Intent.ACTION_BATTERY_OKAY);
    intentFilter.addAction(Intent.ACTION_SCREEN_ON);
    intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
    intentFilter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);
    intentFilter.addAction(Intent.ACTION_HEADSET_PLUG);
    My_Reciver my_reciver = new My_Reciver();
    registerReceiver(my_reciver,intentFilter);
}