android应用后台安装，静默安装的代码实现方法

情景：在一个项目中调用另一个项目，但是要求用户不用多次安装和下载。
所以，就想到要用静默安装的方式来实现。虽然本质也是两个独立的应用，但至少用户感觉不到。。。
网上找到一个方式是通过MMM交叉编译的方式，并且这种静默安装需要用户手机有root权限才可以。

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。

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。

此方式，因为有root限制，所以并没有动手测试。。。。留个记号，以后用到的时候再试试。