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服务初探

2024-07-14 11:47:47   227人阅读

服务：在后台长期运行且没有界面的组件可以用服务执行一些后台监听和获取数据的功能

 
如果不进行手动关闭是不会停止的
 
清单文件需要配置服务节点和添加可读取通话状态的权限
 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.callstatuslistener"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="19" />
    <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.example.callstatuslistener.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>
        <service android:name=".PhoneStatusServices"></service>
    </application>
 
</manifest>
 
package com.example.callstatuslistener;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);    
        
        //开启服务
        Intent intent=new Intent(this,PhoneStatusServices.class);
        startService(intent);
    }
}
 
 
package com.example.callstatuslistener;
 
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
 
public class PhoneStatusServices extends Service {
 
    @Override
    public void onCreate() {
        super.onCreate();
        System.out.println("服务被创建了");
        
        //监视用户电话状态
        TelephonyManager tm=(TelephonyManager) getSystemService(TELEPHONY_SERVICE);
        //监听手机通话状态的变化
        tm.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);
    }
 
    class MyPhoneStateListener extends PhoneStateListener{
 
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            // TODO Auto-generated method stub
            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE://空闲状态，无通话无响铃
                
                break;
                
            case TelephonyManager.CALL_STATE_RINGING://响铃状态
                System.out.println("发现来电号码"+incomingNumber);
                //下面可以进行电话拦截
                break;
                
            case TelephonyManager.CALL_STATE_OFFHOOK://通话状态
                break;
            default:
                break;
            }
            super.onCallStateChanged(state, incomingNumber);
        }
        
    }
    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("服务被销毁了");
    }
 
    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }
 
}
 



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