Wie man eine Taste benutzt, um Text in einer TextView zu setzen und auch Bildschirme zu ändern?

Question

Ich arbeite an einer App für Android 3.0 ab, und ich möchte mit einer Taste zuerst Text in einer Textansicht einstellen und dann Bildschirm von screen1 zu screen2 ändern ...

Hier ist mein Code bisher (Ursachen ein Crash):

Button mainNext = (Button) findViewById(R.id.Recipe1); 
    mainNext.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 

      final TextView mTextView = (TextView) findViewById(R.id.textView3); 
      mTextView.setText("Some Text"); 

      Intent i = new Intent(); 
      i.setClassName("com.bluStudios.Recipes4U.ics", "com.bluStudios.Recipes4U.ics.recipedisplayscreen"); 
      startActivity(i); 
     } 
    }); 

Irgendwelche Ideen ??? Vielen Dank im Voraus: P

EDIT:

-Code für den 1. Bildschirm:

public class Recipe_Button_List extends Activity { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.recipe_button_list); 


    Button mainNext = (Button) findViewById(R.id.Recipe1); 
    mainNext.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 
      final TextView mTextView = (TextView) findViewById(R.id.textView3); 
      mTextView.setText("Some Text"); 
Intent i= new Intent(Recipe_Button_List.this, recipedisplayscreen.class); 
      startActivity(i); 
     } 
    }); 
} 

}

-Code für den 2. Bildschirm:

public class recipedisplayscreen extends Activity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.recipedisplayscreen); 
    ActionBar actionBar = getActionBar(); 
    setTitle(R.string.title); 
    actionBar.setDisplayHomeAsUpEnabled(true);} 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case android.R.id.home: 
       // App icon in action bar clicked; go home 
       Intent intent = new Intent(this, MainScreen.class); 
       intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
       startActivity(intent); 
       return true; 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    } 

@Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.recipe_menu1, menu); 
     return true; 

} 

}

Answer 1

verwenden:

Button mainNext = (Button) findViewById(R.id.Recipe1); 
     mainNext.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
       final TextView mTextView = (TextView) findViewById(R.id.textView3); 
       mTextView.setText("Some Text"); 
    Intent i= new Intent(YOUR_CURRENT_ACTIVTY_NAME.this, recipedisplayscreen.class); 
///or you can use Intent i= new Intent(getBaseContext(),recipedisplayscreen.class); 
       startActivity(i); 
      } 
     }); 

und muss recipedisplayscreen Aktivität in AndroidManifest.xml

Answer 2

I think the your main layout do not contain any textView with id (R.id.textView3). 

Also the right way is to declare the TextView outside the click listener..