代码中执行apk安装、卸载、更新以及静默安装

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
          
        Button installBtn = (Button)findViewById(R.id.install_btn);
        installBtn.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(Intent.ACTION_VIEW);
				intent.setDataAndType(Uri.fromFile(new File("/sdcard/xxx.apk")), 
						"application/vnd.android.package-archive");
				
				MainActivity.this.startActivity(intent);
			}
		});
        
        Button uninstallBtn = (Button)findViewById(R.id.uninstall_btn);
        uninstallBtn.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Uri uri = Uri.parse("package:com.xxx.xxx(包名)");
				Intent intent2 = new Intent(Intent.ACTION_DELETE, uri);   
				MainActivity.this.startActivity(intent2);
			}
		});
    }
}

上述安装不仅可以安装新的apk，也适用于更新旧的apk

更新apk必须保证新旧apk签名一致。

对于data分区的外部应用更新：

       新的apk覆盖旧的apk

对于systen系统分区的内置应用更新：

       system/app/下的旧apk仍然存在，新的apk被复制到data/app下。虽然同时存在两新旧apk，但运行时系统选择data分区的新apk运行！

       如果执行卸载则是删除data分区的apk，再次启动程序运行的是system的旧apk

静默安装

静默安装apk时，程序需要平台签名（使用signapk），

singapk命令行签名

    #java -jar signapk.jar platform.x509.pem platform.pk8 xxx.apk xxx-sign.apk

如果要将apk安装在system分区下还要在mantifest中加入系统权限

    <mantifest

    ...

    android:sharedUserId="android.uid.system" >

uses-permission也需要安装apk的权限

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

eclipse工程需要引入framework.jar

自定义MyPackageInstallObserver类继承自IPackageInstallObserver.Stub

	public void installOnBackground(File file){
		Log.i(TAG, "installOnBackground()");
		int installFlags = 0;
		Uri packageUri = Uri.fromFile(file);	//file是要安装的apk文件
		 
		PackageManager pm = mContext.getPackageManager();
		installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;
		
		MyPackageInstallObserver observer = new MyPackageInstallObserver();
		pm.installPackage(packageUri, observer, installFlags, "com.xxx.xxx包名"); 
	}
	
	private static class MyPackageInstallObserver extends IPackageInstallObserver.Stub{
		@Override
		public void packageInstalled(String packageName, int returnCode)
				throws RemoteException {
			//returnCode=1表示安装成功
			Log.e(TAG, "packageInstalled()");
			Log.i(TAG, "packageName = " + packageName);
			Log.i(TAG, "returnCode = " + returnCode);
		}
	}