android - addAction 到 IntentFilter 以处理电话状态更改

Question

我想接听来电。

我知道您必须在 AndroidManifest 中授予权限并设置接收器

<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，我通过代码设置了接收器，

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

在 addAction 里面我放了 TelephonyManager.ACTION_PHONE_STATE_CHANGED
然后我用

创建了BroadcastReceiver

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

然后，在其中，我使用 String action = intent.getAction(); 从 Intent 中获取操作，然后检查它是哪个操作。

它非常适合蓝牙

filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);

和

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

但它不检查 TelephonyManager.ACTION_PHONE_STATE_CHANGED。

那么，我的问题是:
如何设置 Action (addAction())来监听状态变化？
TelephonyManager.ACTION_PHONE_STATE_CHANGED不对吗？
如果我放弃并在 AndroiManifest 中设置接收器，我将如何设置蓝牙过滤器？我正在使用

BluetoothDevice.ACTION_FOUND
BluetoothAdapter.ACTION_DISCOVERY_STARTED
BluetoothAdapter.ACTION_DISCOVERY_FINISHED

Answer 1

首先在你的 Activity 中注册接收者

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

这是广播接收器:

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");
    }
};