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 := 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^……

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