Intent intent = new Intent(Intent.ACTION_VIEW); 
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); 
startActivity(intent); 

private void runInstall() { 
 int installFlags = 0; 
 int userId = UserHandle.USER_ALL; 
 String installerPackageName = null; 
 
 String opt; 
 
 String originatingUriString = null; 
 String referrer = null; 
 String abi = null; 
 
 while ((opt=nextOption()) != null) { 
  if (opt.equals("-l")) { 
   installFlags |= PackageManager.INSTALL_FORWARD_LOCK; 
  } else if (opt.equals("-r")) { 
   installFlags |= PackageManager.INSTALL_REPLACE_EXISTING; 
  } else if (opt.equals("-i")) { 
   installerPackageName = nextOptionData(); 
   if (installerPackageName == null) { 
    System.err.println("Error: no value specified for -i"); 
    return; 
   } 
  } else if (opt.equals("-t")) { 
   installFlags |= PackageManager.INSTALL_ALLOW_TEST; 
  } else if (opt.equals("-s")) { 
   // Override if -s option is specified. 
   installFlags |= PackageManager.INSTALL_EXTERNAL; 
  } else if (opt.equals("-f")) { 
   // Override if -s option is specified. 
   installFlags |= PackageManager.INSTALL_INTERNAL; 
  } else if (opt.equals("-d")) { 
   installFlags |= PackageManager.INSTALL_ALLOW_DOWNGRADE; 
  } else if (opt.equals("--originating-uri")) { 
   originatingUriString = nextOptionData(); 
   if (originatingUriString == null) { 
    System.err.println("Error: must supply argument for --originating-uri"); 
    return; 
   } 
  } else if (opt.equals("--referrer")) { 
   referrer = nextOptionData(); 
   if (referrer == null) { 
    System.err.println("Error: must supply argument for --referrer"); 
    return; 
   } 
  } else if (opt.equals("--abi")) { 
   abi = checkAbiArgument(nextOptionData()); 
  } else if (opt.equals("--user")) { 
   userId = Integer.parseInt(nextOptionData()); 
  } else { 
   System.err.println("Error: Unknown option: " + opt); 
   return; 
  } 
 } 
 
 if (userId == UserHandle.USER_ALL) { 
  userId = UserHandle.USER_OWNER; 
  installFlags |= PackageManager.INSTALL_ALL_USERS; 
 } 
 
 final Uri verificationURI; 
 final Uri originatingURI; 
 final Uri referrerURI; 
 
 if (originatingUriString != null) { 
  originatingURI = Uri.parse(originatingUriString); 
 } else { 
  originatingURI = null; 
 } 
 
 if (referrer != null) { 
  referrerURI = Uri.parse(referrer); 
 } else { 
  referrerURI = null; 
 } 
 
 // Populate apkURI, must be present 
 final String apkFilePath = nextArg(); 
 System.err.println("\tpkg: " + apkFilePath); 
 if (apkFilePath == null) { 
  System.err.println("Error: no package specified"); 
  return; 
 } 
 
 // Populate verificationURI, optionally present 
 final String verificationFilePath = nextArg(); 
 if (verificationFilePath != null) { 
  System.err.println("\tver: " + verificationFilePath); 
  verificationURI = Uri.fromFile(new File(verificationFilePath)); 
 } else { 
  verificationURI = null; 
 } 
 
 LocalPackageInstallObserver obs = new LocalPackageInstallObserver(); 
 try { 
  VerificationParams verificationParams = new VerificationParams(verificationURI, 
    originatingURI, referrerURI, VerificationParams.NO_UID, null); 
 
  mPm.installPackageAsUser(apkFilePath, obs.getBinder(), installFlags, 
    installerPackageName, verificationParams, abi, userId); //注意！！最终就是调用这个方法来进行安装的 
 
  synchronized (obs) { 
   while (!obs.finished) { 
    try { 
     obs.wait(); 
    } catch (InterruptedException e) { 
    } 
   } 
   if (obs.result == PackageManager.INSTALL_SUCCEEDED) { 
    System.out.println("Success"); 
   } else { 
    System.err.println("Failure [" 
      + installFailureToString(obs) 
      + "]"); 
   } 
  } 
 } catch (RemoteException e) { 
  System.err.println(e.toString()); 
  System.err.println(PM_NOT_RUNNING_ERR); 
 } 
} 

package com.example.autoinstall; 
 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.lang.reflect.Method; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.content.pm.IPackageInstallObserver2; 
import android.content.pm.IPackageManager; 
import android.content.pm.VerificationParams; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.IBinder; 
import android.os.RemoteException; 
import android.view.View; 
 
public class MainActivity extends Activity { 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
 } 
 
 /** 
  * Button点击事件 
  * @param view 
  */ 
 public void install(View view) 
 { 
  String path = ""; 
  if (FileUtils.isSdcardReady()) { 
   path = FileUtils.getSdcardPath(); 
  } else { 
   path = FileUtils.getCachePath(this); 
  } 
  String fileName = path + "/AidlServerDemo.apk"; 
  File file = new File(fileName); 
   
  try { 
   if(!file.exists()) 
    copyAPK2SD(fileName); 
   Uri uri = Uri.fromFile(new File(fileName)); 
      // 通过Java反射机制获取android.os.ServiceManager 
   Class<?> clazz = Class.forName("android.os.ServiceManager"); 
   Method method = clazz.getMethod("getService", String.class); 
   IBinder iBinder = (IBinder) method.invoke(null, "package"); 
   IPackageManager ipm = IPackageManager.Stub.asInterface(iBinder); 
   @SuppressWarnings("deprecation") 
   VerificationParams verificationParams = new VerificationParams(null, null, null, VerificationParams.NO_UID, null); 
      // 执行安装（方法及详细参数，可能因不同系统而异） 
   ipm.installPackage(fileName, new PackageInstallObserver(), 2, null, verificationParams, ""); 
  } catch (Exception e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } 
 
 } 
 
 // 用于显示结果 
 class PackageInstallObserver extends IPackageInstallObserver2.Stub { 
 
  @Override 
  public void onUserActionRequired(Intent intent) throws RemoteException { 
   // TODO Auto-generated method stub 
 
  } 
 
  @Override 
  public void onPackageInstalled(String basePackageName, int returnCode, String msg, Bundle extras) throws RemoteException { 
   //returnCode<span style="font-family: Arial, Helvetica, sans-serif;">为1，就是安装成功</span> 
 
 
  } 
 }; 
 
 /** 
  * 拷贝assets文件夹的APK插件到SD 
  * 
  * @param strOutFileName 
  * @throws IOException 
  */ 
 private void copyAPK2SD(String strOutFileName) throws IOException { 
  FileUtils.createDipPath(strOutFileName); 
  InputStream myInput = this.getAssets().open("AidlServerDemo.apk"); 
  OutputStream myOutput = new FileOutputStream(strOutFileName); 
  byte[] buffer = new byte[1024]; 
  int length = myInput.read(buffer); 
  while (length > 0) { 
   myOutput.write(buffer, 0, length); 
   length = myInput.read(buffer); 
  } 
  myOutput.flush(); 
  myInput.close(); 
  myOutput.close(); 
 } 
} 

<uses-permission android:name="android.permission.INSTALL_PACKAGES"/> 

android:sharedUserId="android.uid.system"