addAction到IntentFilter来处理电话状态更改

Question

我想听一个来电。

我知道你必须在AndroidManifest中提供权限并设置接收器

<uses-permission android:name="android.permission.READ_PHONE_STATE"/> 

和

<receiver ... 
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />...

但是，在我的项目中，我有通过代码设置的接收器

IntentFilter filter = new IntentFilter();
filter.addAction( ... );
registerReceiver(broadcastReceiver, filter);

在addAction里面我把TelephonyManager.ACTION_PHONE_STATE_CHANGED 我用它创建BroadcastReceiver

private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) { ...

然后，在里面，我从String action = intent.getAction();的意图采取行动，我检查它是什么动作。 它适用于蓝牙

filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);

和

switch (action) {
    case BluetoothAdapter.ACTION_DISCOVERY_STARTED: ...

但它没有检查TelephonyManager.ACTION_PHONE_STATE_CHANGED。

所以，我的问题是： 你如何设置动作（addAction()）来听取状态变化？ TelephonyManager.ACTION_PHONE_STATE_CHANGED不对吗？ 如果我放弃并在AndroiManifest中设置接收器，我该如何设置蓝牙滤波器？我正在使用

BluetoothDevice.ACTION_FOUND
BluetoothAdapter.ACTION_DISCOVERY_STARTED
BluetoothAdapter.ACTION_DISCOVERY_FINISHED

Answer 1

首先在您的活动中注册接收者

this.registerReceiver(this.broadcastReceiver, new IntentFilter(TelephonyManager.ACTION_PHONE_STATE_CHANGED));

这是broadcastReceiver：

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

        if (state == null) {

            //Outgoing call
            String number = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
            Log.e("tag", "Outgoing number : " + number);

        } else if (state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)) {

            Log.e("tag", "EXTRA_STATE_OFFHOOK");

        } else if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)) {

            Log.e("tag", "EXTRA_STATE_IDLE");

        } else if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {

            //Incoming call
            String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
            Log.e("tag", "Incoming number : " + number);

        } else
            Log.e("tag", "none");
    }
};

Answer 2

在onCreate()方法中创建此对象：

tMg =(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

listener = new PhoneStateListener{

    onCallStateChanged(int state, String incomingNumber){
         switch(state){
               case EXTRA_STATE_RINGING:
                   // phone is ringing
               break;
               case EXTRA_STATE_OFFHOOK:
                  // phone is offhook
               break;
               case EXTRA_STATE_IDLE:
                 // phone is idle
               break;
         }
    }

}

在onStart()注册你的听众：

tMg.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

在onStop()注销你的听众：

tMg.listen(listener,  PhoneStateListener.LISTEN_NONE);