android监听应用安装，如判断是新安装的应用，还是覆盖安装的应用

android监听应用安装，如判断是新安装的应用，还是覆盖安装的应用？

直接看代码：

    public void onReceive(Context context, Intent intent) {  
    	

        if (intent.getAction().equals(Intent.ACTION_PACKAGE_ADDED)) {     // install  
            String packageName = intent.getDataString();  
            packageName = filterPackage(packageName);
            Log.i(TAG, "install:" + packageName); 
            
        	 boolean isReplacing = intent.getBooleanExtra(Intent.EXTRA_REPLACING,false);
        	 int uid = intent.getIntExtra(Intent.EXTRA_UID,0);
        	Log.i(TAG, "install: isReplacing = " + isReplacing); 
        	Log.i(TAG, "install: uid = " + uid); 
        	if(!isReplacing){
        		//全新安装

        	} 
        }
    }