Android學習筆記 - 通話狀態(PhoneState)

1. 利用繼承PhoneStateListener來實作當通話狀態為閒置、接起或響起時我們所要做的動作。

2. 由於我們需取得目前手機的通話狀態，因此必需在AndroidManifest.xml內新增一個讀取通話狀態的權限。

3. MainActivity.java

package org.me.android_callstate;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        //電話狀態的Listener
        MyPhoneStateListener myPhoneStateListener = new MyPhoneStateListener();
        //取得TelephonyManager
        TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        //將電話狀態的Listener加到取得TelephonyManager
        telephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
    }

    public class MyPhoneStateListener extends PhoneStateListener {
        @Override
        public void onCallStateChanged(int state, String phoneNumber) {
            switch (state) {
                //電話狀態是閒置的
                case TelephonyManager.CALL_STATE_IDLE:
                    break;
                //電話狀態是接起的
                case TelephonyManager.CALL_STATE_OFFHOOK:
                    Toast.makeText(MainActivity.this, "正接起電話…", Toast.LENGTH_LONG).show();
                    break;
                //電話狀態是響起的
                case TelephonyManager.CALL_STATE_RINGING:
                    Toast.makeText(MainActivity.this, phoneNumber + "正打電話來…", Toast.LENGTH_LONG).show();
                    break;
                default:
                    break;
            }
        }
    }
}

4. AndroidManifest.xml

<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.me.android_callstate">
    <application>
         <activity android:name=".MainActivity" android:label="MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
</manifest>

4. 執行之後的畫面。