难以通过应用程序启动应用程序（同时）

Question

我是新来的机器人..实际上我试图增加内存的Android手机通过我的应用程序..为此，我创建了一个活动，我可以启动其他应用程序出现在我们的手机中。这种方法正在成功减少RAM内存。但我面临着一个困难，因为我无法在应用程序启动后看到PARENT活动。我需要按其他活动（被推出），以在后台，只要它已经推出，总是我需要的家长活动是可见的运行..

package com.android; 

import java.util.List; 
import android.app.Activity; 
import android.app.ActivityManager; 
import android.app.ActivityManager.MemoryInfo; 
import android.content.ActivityNotFoundException; 
import android.content.ComponentName; 
import android.content.Context; 
import android.content.ContextWrapper; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.content.pm.ResolveInfo; 
import android.os.Bundle; 
import android.os.Handler; 
import android.widget.LinearLayout; 
import android.widget.Toast; 
/** 
* GraphViewDemo creates some dummy data to demonstrate the GraphView component. 
* @author Arno den Hond 
**/ 
public class VsActivity extends Activity { 
    /** 
    * Variable Array for GraphView 
    * verlabel : Background Height Values 
    * horlabel : Background Width Values 
    * values : Max Values of Foreground Active Graph 
    */ 
    private float[] values = new float[60]; 
    long availableMegs; 
    private String[] verlabels = new String[]  { "500","450","400","350","300","250","200","150","100","50","0"}; 
    private String[] horlabels = new String[] {"0","10", "20", "30", "40", "50", "60"}; 
    private GraphView graphView; 
    private LinearLayout graph; 
    private boolean runnable = false; 
    public static int datasend,test=0; 
    int cnt=0; 
    Activity activity = this.activity; 
    static int count=0; 
    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     graph = (LinearLayout)findViewById(R.id.graph); 
     graphView = new GraphView(this, values, "TEST GRAPH", horlabels, verlabels, GraphView.LINE); 
     graph.addView(graphView); 
     runnable = true; 
     startDraw.start(); 
    } 

    @Override 
    public void onDestroy(){ 
     super.onDestroy(); 
     runnable = false; 
    } 

    public void setGraph(){ 
     int i,j; 
     count=count+10; 
     try{ 
       j=values.length-1; 
     for(i=0; i<values.length-1; i++){ 
      values[i] = values[i+1]; 
     } 
     MemoryInfo mi = new ActivityManager.MemoryInfo(); 
     ActivityManager activityManager = (ActivityManager) getApplicationContext() 
      .getSystemService(ACTIVITY_SERVICE); 
     activityManager.getMemoryInfo(mi); 
     datasend= (int)((mi.availMem/1048576)); 
values[values.length-1] = (float) datasend;   
graph.removeView(graphView); 
     graph.addView(graphView); 
     } 
     catch (Exception e){ 
      // e.printstacktrace(); 
     } 
    } 

private void launchComponent(String packageName, String name){ 
    System.out.println("launch application "+datasend); 
    Intent launch_intent = new Intent("android.intent.action.MAIN"); 
    launch_intent.addCategory("android.intent.category.LAUNCHER"); 
    launch_intent.setComponent(new ComponentName(packageName, name)); 
    launch_intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    if(datasend > 24){ 
     System.out.println("launch application inside if "+packageName+" "+name); 
    this.startActivity(launch_intent); 
    } 
} 

public void startApplication(){ 
    String application_name = ""; 
    test=1; 
    //ContextWrapper activity = this.activity; 
    try{ 
     System.out.println("Start application "); 
     Intent intent = new Intent("android.intent.action.MAIN"); 
     intent.addCategory("android.intent.category.LAUNCHER"); 
     List<android.content.pm.PackageInfo> packageList; 
     intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); 
     PackageManager pm = this.getPackageManager(); 
     packageList = pm.getInstalledPackages(0); 
     List<ResolveInfo> resolveinfo_list = pm.queryIntentActivities(intent, 0); 

     for(ResolveInfo info:resolveinfo_list){ 
      application_name = info.activityInfo.packageName; 
      System.out.println(info.activityInfo.packageName+" "+info.activityInfo.name); 
      //if(info.activityInfo.packageName.equalsIgnoreCase(application_name)){ 
       launchComponent(info.activityInfo.packageName, info.activityInfo.name); 
       // break; 
      // } 
     } 
    } 
    catch (ActivityNotFoundException e) { 
     Toast.makeText(activity.getApplicationContext(), "There was a problem loading the application: "+application_name,Toast.LENGTH_SHORT).show(); 
    } 
} 
public Handler handler = new Handler(){ 
    @Override 
    public void handleMessage(android.os.Message msg){ 
     switch(msg.what){ 

     case 0x01: 
      setGraph(); 
      // if(test == 0){ 
      startApplication();//} 
      break; 
     } 
    } 
}; 

public Thread startDraw = new Thread(){ 
    @Override 
    public void run(){ 
     while(runnable){ 
      handler.sendEmptyMessage(0x01); 
      try{ 
       MemoryInfo mi = new ActivityManager.MemoryInfo(); 
       ActivityManager activityManager = (ActivityManager)getSystemService(ACTIVITY_SERVICE); 
       activityManager.getMemoryInfo(mi); 
       long ava = mi.availMem/1048576L; 
       //count=(int)ava; 
       //System.out.println("SUDARHAN RAMAN "+ava+" "+count); 
       Thread.sleep(1000); 
      } catch (Exception e){ 
       // e.printstacktrace(); 
      } 
     } 
    } 
}; 
} 

这里GraphView是查看这将吸引使用Canvas.drawline（...） 在上面的代码startapplication（）将启动子活动（安装在我们的手机应用程序）的图..

plz帮助...

Answer 1

 Intent i = new Intent(Intent.ACTION_MAIN); 
      PackageManager manager = mContext.getPackageManager(); 
      i = manager.getLaunchIntentForPackage(_AppPkgName); 
      i.addCategory(Intent.CATEGORY_LAUNCHER); 
      startActivity(i);