android应用后台安装

android应用后台安装，静默安装的代码实现方法
http://hi.baidu.com/6936995/blog/item/eca4436387a80d7b0d33fa31.html
首先，你要有linux环境或其他可以mmm交叉编译的环境，因为这个用到的是隐藏api，SDK中没有的，ecilipse里面会提示包不存在，但交叉编译可以，如果你不知道mmm编译，请return。
代码如下：
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.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;
public class InstallActivity extends Activity {
    /** Called when the activity is first created. */
    private Button btn2=null;
    private final int INSTALL_COMPLETE = 1;
    final static int SUCCEEDED = 1;
    final static int FAILED = 0;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn=(Button) findViewById(R.id.btn2);
        btn2.setOnClickListener(listener2);
}
private OnClickListener listener2=new  OnClickListener(){
        public void onClick(View v) {
            String fileName = Environment.getExternalStorageDirectory() +  "/baidu/"+"UC.apk";
            Uri uri = Uri.fromFile(new File(fileName));

            int installFlags = 0;
            PackageManager pm = getPackageManager();
            try {
                PackageInfo pi = pm.getPackageInfo("com.uc.browser",
                        PackageManager.GET_UNINSTALLED_PACKAGES);
                if(pi != null) {
                    installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;
                }
            } catch (NameNotFoundException e) {
            }


//            String installerPackageName = getIntent().getStringExtra(
//                    Intent.EXTRA_INSTALLER_PACKAGE_NAME);
           
            PackageInstallObserver observer = new PackageInstallObserver();
            pm.installPackage(uri, observer, installFlags, "com.uc.browser");


        }
    };
   
    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:
                    // Update the status text
                    // Show the ok button
                    int centerTextLabel;
                    Drawable centerTextDrawable = null;
                    if(msg.arg1 == SUCCEEDED) {
                       
                    } else {}
                    if (centerTextDrawable != null) {}

                    break;
                default:
                    break;
            }
        }
    };
  
}

重点是要实现一个这个类PackageInstallObserver，另外要注意import android.content.pm.……的那些包一定要导入。android.mk文件如下
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := user

LOCAL_SRC_FILES := $(call all-subdir-java-files)

LOCAL_PACKAGE_NAME := InstallActivity
LOCAL_CERTIFICATE := platform

include $(BUILD_PACKAGE)
重点是LOCAL_CERTIFICATE := platform要对

另外编译的时候有可能会报R.java类重复错误，把你工程下gen文件夹删除即可，不会影响编译，传说中会在别的地方自动生成^……

作为一个新手，研究了四天无果，网上苦苦追寻无果，最后还是再前辈的带领下看系统安装源代码得来。看来要学好android还是要会看源代码。卷毛大帝。
这个在2.1上编译通过可以用，后台安装可以实现，后台卸载也可以实现，可以和安卓市场一样了。希望大家不要用这个功能搞图谋不轨的事情。

现在把工程和apk传上来大家看看，这种方法看来也不是适用于每一个系统，android系统太不统一了，只能这样了。