单击后检查 SharedPref

Question

I am trying to make a system that, when a user downloads my app, the user earns coins. Users must press the verify button after installation. Yes, he can earn a coin. But I am trying to do a disable verify button after one click because after app installs users can press a lot of times and earn a lot of coins. (verify button: check app installation and give a coin to the user) When user clicks verify button sharedprefs value go False

But I don't understand that it is not working. I tried to implement code in different positions and try to insert new boolean for holding "canearn" data but it doesn't work. Thanks for your help. (Sorry for bad syntax:( )

  private SharedPreferences coins;
  private SharedPreferences sharedPref ;

@Override
protected void onCreate(Bundle savedInstanceState) {
    coins = getSharedPreferences("Rewards", MODE_PRIVATE);
    sharedPref = getSharedPreferences("canearn",MODE_PRIVATE);

    bttn3 = (Button)findViewById(R.id.veribut1);
     bttn3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
         //   SharedPreferences getter = getSharedPreferences("canearn", Activity.MODE_PRIVATE);
         //   boolean test = sharedPref.getBoolean("canearn",true);

        if(sharedPref.getBoolean("canearn",true) == true) {

                final List<String> installedPackages = getInstalledAppsPackageNameList();
                String packageNameC = "com.********";


                    if (installedPackages.contains(packageNameC)) {

                    int coinCount = Integer.parseInt(coins.getString("Coins", "0"));

                    SharedPreferences.Editor editor = sharedPref.edit();
                    editor.putBoolean("canearn", false); //add boolean
                    editor.commit(); //save
                    coinCount = coinCount + 500;
                    SharedPreferences.Editor coinsEdit = coins.edit();
                    coinsEdit.putString("Coins", String.valueOf(coinCount));
                    coinsEdit.apply();
                    Toast.makeText(getApplication(), "Coin Earned", Toast.LENGTH_LONG).show();



                }    else {
                    Toast.makeText(getApplication(), "Install and Open App first", Toast.LENGTH_LONG).show();
                }


            }
            else
            {             
       Log.i("app","dontcount");
            }
        }
    });

Answer 1

Well,there are many ways to achieve your goal but if you want to disable the button. You can just use

bttn3.setEnabled(false);

at the end of your onClick() function. No need to make preferences false You should also setVisibility() as per your question to make the button invisible as you won't be needing it.

Answer 2

Do one thing, inside the onCreate() method, check the SharedPreferences value for the coin. If the user has received a coin,

bttn3.setClickable(false);