Android在Service中弹出对话框(Dialog)，即全局性对话框

先说具体做法，源代码在其后给出：
写好Alter功能块后，在alter.show()语句前加入：
alert.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
注：alter为AlertDialog类型对象
然后在AndroidManifest.xml中加入权限：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"></uses-permission>

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下面进行简单的解释：
如果只在Service中写入常在Activity中使用的创建Alter的代码，运行时是会发生错误的，因为Alter的显示需要依附于一个确定的Activity类。而以上做法就是声明我们要弹出的这个提示框是一个系统的提示框，即全局性质的提示框，所以只要手机处于开机状态，无论它现在处于何种界面之下，只要调用alter.show()，就会弹出提示框来。

MainActivity如下:

  
  
 
 
   
   
  
  package cn.testservice1;
   
   
  
  
   
   
  
  import android.os.Bundle;
   
   
  
  import android.view.View;
   
   
  
  import android.view.View.OnClickListener;
   
   
  
  import android.widget.Button;
   
   
  
  import android.app.Activity;
   
   
  
  import android.content.Intent;
   
   
  
  /**
   
   
  
   * Demo描述:
   
   
  
   * 在服务中显示对话框
   
   
  
   * 
   
   
  
   * 核心提示:
   
   
  
   * 为Dialog设置:
   
   
  
   * dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
   
   
  
   * 
   
   
  
   * 注意权限:
   
   
  
   * <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
   
   
  
   */
   
   
  
  public class MainActivity extends Activity {
   
   
  
   private Button mStartButton;
   
   
  
   private Button mStopButton;
   
   
  
   private Intent intent;
   
   
  
   @Override
   
   
  
   protected void onCreate(Bundle savedInstanceState) {
   
   
  
   super.onCreate(savedInstanceState);
   
   
  
   setContentView(R.layout.main);
   
   
  
   init();
   
   
  
   }
   
   
  
   private void init(){
   
   
  
   intent=new Intent();
   
   
  
   intent.setAction("cc.test.com");
   
   
  
   
   
   
  
   //开启服务
   
   
  
   mStartButton=(Button) findViewById(R.id.startButton);
   
   
  
   mStartButton.setOnClickListener(new OnClickListener() {
   
   
  
   @Override
   
   
  
   public void onClick(View view) {
   
   
  
   startService(intent);
   
   
  
   }
   
   
  
   });
   
   
  
   
   
   
  
   //终止服务
   
   
  
   mStopButton=(Button) findViewById(R.id.stopButton);
   
   
  
   mStopButton.setOnClickListener(new OnClickListener() {
   
   
  
   @Override
   
   
  
   public void onClick(View view) {
   
   
  
   stopService(intent);
   
   
  
   }
   
   
  
   });
   
   
  
   }
   
   
  
   
   
   
  
  
   
   
  
  }

ServiceSubclass如下:

  
  
 
 
   
   
  
  package cn.testservice1;
   
   
  
  
   
   
  
  import android.app.AlertDialog.Builder;
   
   
  
  import android.app.Dialog;
   
   
  
  import android.app.Service;
   
   
  
  import android.content.Intent;
   
   
  
  import android.os.IBinder;
   
   
  
  import android.view.WindowManager;
   
   
  
  
   
   
  
  public class ServiceSubclass extends Service {
   
   
  
  
   
   
  
   @Override
   
   
  
   public IBinder onBind(Intent arg0) {
   
   
  
   return null;
   
   
  
   }
   
   
  
   
   
   
  
   public void onCreate() {
   
   
  
   System.out.println("---> Service onCreate()");
   
   
  
   }
   
   
  
   
   
   
  
   @Override
   
   
  
   public void onStart(Intent intent, int startId) {
   
   
  
   super.onStart(intent, startId);
   
   
  
   System.out.println("---> Service onStart()");
   
   
  
   }
   
   
  
   
   
   
  
   @Override
   
   
  
   public int onStartCommand(Intent intent, int flags, int startId) {
   
   
  
   System.out.println("---> Service onStartCommand()");
   
   
  
   for (int i = 0; i < 10000; i++) {
   
   
  
   if (i==9527) {
   
   
  
   Builder builder=new Builder(getApplicationContext());
   
   
  
   builder.setTitle("Title");
   
   
  
   builder.setMessage("This is message");
   
   
  
   builder.setNegativeButton("OK", null);
   
   
  
   Dialog dialog=builder.create();
   
   
  
   dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
   
   
  
   dialog.show();
   
   
  
   }
   
   
  
   }
   
   
  
   return super.onStartCommand(intent, flags, startId);
   
   
  
   }
   
   
  
   
   
   
  
   @Override
   
   
  
   public void onDestroy() {
   
   
  
   super.onDestroy();
   
   
  
   System.out.println("---> Service onDestroy()");
   
   
  
   }
   
   
  
  
   
   
  
   
   
   
  
  }

main.xml如下:

  
  
 
 
   
   
  
  <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:gravity="center_horizontal"
   
   
  
   >
   
   
  
  
   
   
  
   <Button
   
   
  
   android:id="@+id/startButton"
   
   
  
   android:layout_width="200dip"
   
   
  
   android:layout_height="150dip"
   
   
  
   android:text="启动Service" 
   
   
  
   />
   
   
  
   
   
   
  
   <Button
   
   
  
   android:id="@+id/stopButton"
   
   
  
   android:layout_width="200dip"
   
   
  
   android:layout_height="150dip"
   
   
  
   android:text="停止Service" 
   
   
  
   />
   
   
  
  
   
   
  
  </LinearLayout>

AndroidManifest.xml如下:

  
  
 
 
   
   
  
  <?xml version="1.0" encoding="utf-8"?>
   
   
  
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   
   
  
   package="cn.testservice1"
   
   
  
   android:versionCode="1"
   
   
  
   android:versionName="1.0" >
   
   
  
  
   
   
  
   <uses-sdk
   
   
  
   android:minSdkVersion="8"
   
   
  
   android:targetSdkVersion="8" />
   
   
  
   
   
   
  
   <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
   
   
  
  
   
   
  
   <application
   
   
  
   android:allowBackup="true"
   
   
  
   android:icon="@drawable/ic_launcher"
   
   
  
   android:label="@string/app_name"
   
   
  
   android:theme="@style/AppTheme" >
   
   
  
   <activity
   
   
  
   android:name="cn.testservice1.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>
   
   
  
   
   
   
  
   <!-- 注册服务 -->
   
   
  
   <service android:name="cn.testservice1.ServiceSubclass">
   
   
  
   <intent-filter >
   
   
  
   <action android:name="cc.test.com"/>
   
   
  
   </intent-filter>
   
   
  
   </service>
   
   
  
   </application>
   
   
  
  
   
   
  
  </manifest>

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