android 安装assets下的apk

来源：互联网发布：机智软件破解版编辑：程序博客网时间：2024/05/16 07:40

判断手机已安装某程序的方法：
private boolean isAvilible(Context context, StringpackageName){
final PackageManager packageManager =context.getPackageManager();//获取packagemanager
List< packageInfo> pinfo =packageManager.getInstalledPackages(0);//获取所有已安装程序的包信息
List pName = new ArrayList();//用于存储所有已安装程序的包名
//从pinfo中将包名字逐一取出，压入pName list中
if(pinfo != null){
for(int i = 0; i < pinfo.size(); i++){
String pn = pinfo.get(i).packageName;
pName.add(pn);
}
}
returnpName.contains(packageName);//判断pName中是否有目标程序的包名，有TRUE，没有FALSE
}

判断后的逻辑：
//已安装，打开程序，需传入参数包名："com.skype.android.verizon"

//安装程序，一般是先把apk放到assets目录下，安装时，先将文件copy到sd卡或其它实际目录下，再通过程序来安装
if(isAvilible(this, "com.skype.android.verizon")){

if(copyApkFromAssets(this, "test.apk", Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.apk")){
Intent intent = newIntent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.parse("file://" +Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.apk"),
"application/vnd.android.package-archive");
mContext.startActivity(intent);

}
}
//未安装，跳转至market下载该程序
else {
Uri uri =Uri.parse("market://details?id=com.skype.android.verizon");//id为包名
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
}

public boolean copyApkFromAssets(Context context,String fileName, String path) {
   boolean copyIsFinish =false;
   try {
    InputStreamis = context.getAssets().open(fileName);
    File file =new File(path);
   file.createNewFile();
   FileOutputStream fos = newFileOutputStream(file);
    byte[] temp= new byte[1024];
    int i =0;
    while ((i =is.read(temp)) > 0) {
    fos.write(temp, 0, i);
   }
   fos.close();
   is.close();
    copyIsFinish= true;
   } catch (IOException e){
   e.printStackTrace();
   }
   returncopyIsFinish;
  }

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