Google Android - это несложно

Код: Выделить всё

public class Level25Activity extends Activity implements OnClickListener {
	int count;
	String Coins;
	TextView coins;
	TextView tvOut;
	Button button1;
	Button button2;
	Button back;
	Button answertrue;
	Button next;
	

	@Override
	  protected void onCreate(Bundle savedInstanceState) 
	    {
		
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.level25);
	        Intent intent = getIntent();

	        count = intent.getIntExtra("Coins", count);
	        tvOut = (TextView) findViewById(R.id.tvOut);
	        coins = (TextView) findViewById(R.id.coins);
	        coins.setText("Coins:" + count);
	       
	        back = (Button) findViewById(R.id.back);
	        back.setOnClickListener(this);
	       button1 = (Button) findViewById(R.id.button1);
	        button1.setOnClickListener(this);
	        button2 = (Button) findViewById(R.id.button2);
	        button2.setOnClickListener(this);
	       answertrue = (Button) findViewById(R.id.answertrue);
	        answertrue.setOnClickListener(this);
	        next = (Button) findViewById(R.id.next);
	        next.setOnClickListener(this);
}
public void onClick(View v) {
		
        switch (v.getId()) {
        case R.id.button1:
       
        	coins.setText("Coins:" + --count);
        	tvOut.setText(R.string.answer2);
    
        	Intent c = new Intent(getApplicationContext(), Level26Activity.class);
            c.putExtra("Coins",count);
            c.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(c); 
        	break;
        case R.id.button2:
        	coins.setText(" Coins:" +  --count);
        	tvOut.setText(R.string.answer2);
        	Intent a = new Intent(getApplicationContext(), Level26Activity.class);
            a.putExtra("Coins",count);
            a.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(a); 
        	break;
        case R.id.answertrue:
        	coins.setText(" Coins:" +  ++count);
        	tvOut.setText(R.string.answer1);
        	Intent b = new Intent(getApplicationContext(), Level26Activity.class);
            b.putExtra("Coins",count);
            b.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(b); 
        	break;
     
                case R.id.back:
               
                	
                 	Intent x = new Intent(getApplicationContext(), FirstActivity.class);
            
                    startActivity(x);
                	break;
                case R.id.next:
                	Intent o = new Intent(getApplicationContext(), Level26Activity.class);
                    o.putExtra("Coins",count);
                    o.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(o); 
                    break;
              
                	
              
        }
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        Intent a = new Intent(this,FirstActivity.class);
        a.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(a);
        return true;
    }
    return super.onKeyDown(keyCode, event);
}       
@Override
protected void onStop() {
  super.onStop();
}
}