我们还可以使用TelephonyManager类获取呼叫状态信息。为此,我们需要通过传递PhonStateListener实例来调用TelephonyManager类的listen方法。
必须实现PhoneStateListener接口以获取呼叫状态。它提供一种方法onCallStateChanged()。
Android通话状态示例
让我们看一个示例,在此示例中,我们确定电话是在响铃还是在通话中,或者电话既不在响铃也不在通话中。
activity_main.xml
在此示例中,此文件中没有任何组件。
活动类
让我们编写代码以了解调用状态。
package com.srcmini.callstates;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.Menu;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TelephonyManager telephonyManager =
(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
PhoneStateListener callStateListener = new PhoneStateListener() {
public void onCallStateChanged(int state, String incomingNumber)
{
if(state==TelephonyManager.CALL_STATE_RINGING){
Toast.makeText(getApplicationContext(), "Phone Is Riging", Toast.LENGTH_LONG).show();
}
if(state==TelephonyManager.CALL_STATE_OFFHOOK){
Toast.makeText(getApplicationContext(), "Phone is Currently in A call", Toast.LENGTH_LONG).show();
}
if(state==TelephonyManager.CALL_STATE_IDLE){
Toast.makeText(getApplicationContext(), "phone is neither ringing nor in a call", Toast.LENGTH_LONG).show();
}
}
};
telephonyManager.listen(callStateListener, PhoneStateListener.LISTEN_CALL_STATE);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
AndroidManifest.xml
你需要在AndroidManifest.xml文件中提供READ_PHONE_STATE权限。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:androclass="http://schemas.android.com/apk/res/android"
package="com.srcmini.callstates"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<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.srcmini.callstates.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>
</manifest>