Question: I want my app to have an activity that shows instruction on how to use the app. However, this "instruction" screen shall only be showed once after an install, how do you do this?

Answer: 
You can test wether a special flag (let's call it `firstRun`) is set in your application `SharedPreferences`. If not, it's the first run, so show your activity/popup/whatever with the instructions and then set the `firstRun` in the preference.

```
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    SharedPreferences settings = getSharedPreferences("prefs", 0);
    boolean firstRun = settings.getBoolean("firstRun", true);
    if ( firstRun )
    {
        // here run your first-time instructions, for example :
        startActivityForResult(
             new Intent(context, InstructionsActivity.class),
             INSTRUCTIONS_CODE);

    }
 }

// when your InstructionsActivity ends, do not forget to set the firstRun boolean
 protected void onActivityResult(int requestCode, int resultCode,
         Intent data) {
     if (requestCode == INSTRUCTIONS_CODE) {
         SharedPreferences settings = getSharedPreferences("prefs", 0);
         SharedPreferences.Editor editor = settings.edit();
         editor.putBoolean("firstRun", false);
         editor.commit();
     }
 }

```
**yes, you can fix this problem with SharedPreferences**

```
SharedPreferences pref;
SharedPreferences.Editor editor;

pref = getSharedPreferences("firstrun", MODE_PRIVATE);
editor = pref.edit();

editor.putString("chkRegi","true");
editor.commit();

```

Then check String chkRegi ture or false