Android 电话状态监听

   今天介绍一下Android电话状态的监听。监听Android电话状态需要用到PhoneStateListener。下面通过一个具体的实例来看看具体怎么实现的。

配置文件：

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

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.pan.phonecalldemo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Call:130 6681 9390" />

</RelativeLayout>代码：
public class MainActivity extends Activity {
private ListenToPhoneState listener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button1).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
call();
}
});
}

private void call() {
try {
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:13723740766"));
startActivity(callIntent);

TelephonyManager tManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
listener = new ListenToPhoneState();
tManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);
} catch (ActivityNotFoundException activityException) {
Log.e("telephony-example", "Call failed", activityException);
}
}

private class ListenToPhoneState extends PhoneStateListener {

public void onCallStateChanged(int state, String incomingNumber) {
Log.i("telephony-example", "State changed: " + stateName(state));
}

String stateName(int state) {
switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
return "Idle";
case TelephonyManager.CALL_STATE_OFFHOOK:
return "Off hook";
case TelephonyManager.CALL_STATE_RINGING:
return "Ringing";
}
return Integer.toString(state);
}
}

}