android实现静默安装与卸载的方法

import java.io.File;
import android.app.Activity;
import android.os.Bundle;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.IPackageInstallObserver;
import android.content.pm.IPackageDeleteObserver;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class InstallActivity extends Activity {
 /** Called when the activity is first created. */
 private String APK_NAME = "QQHD-mini.apk";
 private Button install = null;
 private Button uninstall = null;
 private final int INSTALL_COMPLETE = 1;
 private final int UNINSTALL_COMPLETE = 2;
 final static int SUCCEEDED = 1;
 final static int FAILED = 0;
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.install_uninstall);
  install = (Button) findViewById(R.id.install);
 uninstall = (Button) findViewById(R.id.uninstall);
 uninstall.setOnClickListener(listener1);
  install.setOnClickListener(listener2);
}
 private OnClickListener listener2=new OnClickListener(){
  public void onClick(View v) {
   String fileName = Environment.getExternalStorageDirectory() + "/" + APK_NAME; 
   Uri uri = Uri.fromFile(new File(fileName));
   int installFlags = 0;
   PackageManager pm = getPackageManager();
   try {
    PackageInfo pi = pm.getPackageInfo("com.tencent.minihd.qq", 
      PackageManager.GET_UNINSTALLED_PACKAGES);
    if(pi != null) {
     installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;
    }
   } catch (NameNotFoundException e) {}
   PackageInstallObserver observer = new PackageInstallObserver();
   pm.installPackage(uri, observer, installFlags, "com.tencent.minihd.qq");
  }
 };
 class PackageInstallObserver extends IPackageInstallObserver.Stub {
  public void packageInstalled(String packageName, int returnCode) {
   Message msg = mHandler.obtainMessage(INSTALL_COMPLETE);
   msg.arg1 = returnCode;
   mHandler.sendMessage(msg);
  }
 };
 private Handler mHandler = new Handler() {
  public void handleMessage(Message msg) {
   switch (msg.what) {
    case INSTALL_COMPLETE:
     int centerTextLabel;
     Drawable centerTextDrawable = null;
     if(msg.arg1 == SUCCEEDED) {
      Toast.makeText(getApplicationContext(), "install apk SUCCEEDED", Toast.LENGTH_SHORT).show();
     } else {}
     if (centerTextDrawable != null) {}
     break;
 case UNINSTALL_COMPLETE:
     int centerTextLabel2;
     Drawable centerTextDrawable2 = null;
     if(msg.arg1 == SUCCEEDED) {
      Toast.makeText(getApplicationContext(), "uninstall apk SUCCEEDED", Toast.LENGTH_SHORT).show();
     } else {}
     if (centerTextDrawable2 != null) {}
     break; 
    default:
     break;
   }
  }
 };
 private OnClickListener listener1=new OnClickListener(){
  public void onClick(View v) {
   PackageManager pm = getPackageManager();
   PackageDeleteObserver observer = new PackageDeleteObserver();
   pm.deletePackage("com.tencent.minihd.qq", observer, 0);
  }
 };
 private class PackageDeleteObserver extends IPackageDeleteObserver.Stub {
  public void packageDeleted(String packageName, int returnCode) {
   Message msg = mHandler.obtainMessage(UNINSTALL_COMPLETE);
   msg.arg1 = returnCode;
   mHandler.sendMessage(msg);
  } 
 }
}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INSTALL_PACKAGES" />
<uses-permission android:name="android.permission.DELETE_PACKAGES" />
<uses-permission android:name="android.permission.CLEAR_APP_CACHE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.CLEAR_APP_USER_DATA" />

private void test() {
 execCommand("system/bin/pm install -r " + "sdcard/xxx.apk");
 // xxx.apk放置在内置储存的根目录下（mnt/sdcard/xxx.apk）
 // execCommand("system/bin/pm uninstall " + PACKAGE_NAME); 
 //PACKAGE_NAME为xxx.apk包名
 }
 public boolean execCommand(String cmd) {
 Process process = null;
 try {
 process = Runtime.getRuntime().exec(cmd);
 process.waitFor();
 } catch (Exception e) {
 return false;
 } finally {
 try {
 process.destroy();
 } catch (Exception e) {
 }
 }
 return true;
}