android应用后台安装，静默安装的代码实现方法

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

 

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 := userLOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_PACKAGE_NAME := InstallActivityLOCAL_CERTIFICATE := platforminclude $(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^……

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