判断某个apk是否已经安装

/**
     * 判断apk是否已经安装
     * @param uri  apk包名
     * @return
     */
    private boolean isAppInstalled(String uri){
    PackageManager pm = getPackageManager();
    boolean installed =false;
    try{
    pm.getPackageInfo(uri,PackageManager.GET_ACTIVITIES);
    installed =true;
    }catch(PackageManager.NameNotFoundException e){
    installed =false;
    }
    return installed;
    }

调用

if(isAppInstalled("com.adobe.air")){
Toast.makeText(getApplicationContext(), "已经安装Adodeair插件",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getApplicationContext(), "没有安装Adodeair插件",Toast.LENGTH_SHORT).show();
}

判断某个apk是否已经安装

原文：http://blog.csdn.net/huningjun/article/details/45740429