android 擷取裝置中已啟動的服務並判斷某一服務是否啟動

標籤：activitymanager   service   runningserviceinfo   系統服務   已啟動服務   

我們常常在開發的時候,通過擷取系統已啟動的服務來判斷該伺服器是否還需要再啟動。

而本文將介紹android裝置中已啟動的服務,並判斷某一服務是啟動

1.根據ACTIVITY_SERVICE擷取系統服務

activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);

2.擷取系統中正在啟動並執行服務

runningList = activityManager.getRunningServices(30);//代表我們希望返回的服務數目大小 30

：

執行個體代碼如下

1) activity_main.xml

<span style="font-size:18px;"><LinearLayout 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:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin" >    <Button        android:id="@+id/service_btn"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/get_all_service" />    <TextView        android:id="@+id/display_service_tv"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:layout_marginTop="20dp"        android:text="@string/display_all_service"         android:textColor="#FF0000" /></LinearLayout></span>

2).strings.xml

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">AndroidServiceDemo</string>    <string name="display_all_service">顯示所有服務:</string>    <string name="action_settings">Settings</string>    <string name="get_all_service">擷取所有服務</string></resources></span>

3)MainActivity.java

<span style="font-size:18px;">package com.example.androidservicedemo;import java.util.List;import android.app.Activity;import android.app.ActivityManager;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {private TextView displayAllServiceTv;private Button getAllServiceBtn;private ActivityManager activityManager;private List<ActivityManager.RunningServiceInfo> runningList;private String myServiceClassName = "org.linphone.LinphoneService";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);final String defaultStr = this.getResources().getString(R.string.display_all_service);displayAllServiceTv = (TextView) this.findViewById(R.id.display_service_tv);getAllServiceBtn = (Button) this.findViewById(R.id.service_btn);getAllServiceBtn.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubStringBuffer displaySb = new StringBuffer();displaySb.append(defaultStr).append("\n");activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);runningList = activityManager.getRunningServices(30);//代表我們希望返回的服務數目大小 30displaySb.append(myServiceClassName).append(":").append(myServiceIsStart(runningList,myServiceClassName)).append("\n");displayAllServiceTv.setText(getAllService(runningList,displaySb).toString());}});}private boolean myServiceIsStart(List<ActivityManager.RunningServiceInfo> runningList,String myServiceClassName){boolean isStart = false;for(ActivityManager.RunningServiceInfo runningService:runningList){if(myServiceClassName.equals(runningService.service.getClassName())){isStart = true;break;}}return isStart;}private StringBuffer getAllService(List<ActivityManager.RunningServiceInfo> runningList,StringBuffer displaySb){for(ActivityManager.RunningServiceInfo runningService:runningList){displaySb.append(runningService.service.getClassName()).append("\n");}return displaySb;}@Overridepublic 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;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}}</span>