I got a little problem. I think the solution is very simple but unfortunately I can't find it. I hope someone can help me I got a while-loop who has to count up to ten and write the number into a TextView. It still doesn't work ... Thanks for your help! Here is the code:
package de.androidnewcomer.animation;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import static android.R.attr.button;
import static de.androidnewcomer.animation.R.id.textView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView ball=(ImageView)findViewById(R.id.ball);
Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
count();
break;
}
}
private void count() {
TextView textView=(TextView)findViewById(R.id.textView);
int i;
i=1;
while(i<10) {
i++;
textView.setText(i);
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
Using setText() with an integer value is for setting a string resource reference. To set the text itself, you have to provide a string: Use setText("" + i); and it should work.
The textView.setText(..) needs a string object, but you use a int. You have to convert your int into a string with the following possible options:
You can use String.valueOf(i): textView.setText(String.valueOf(i));
You can use Integer.toString(i): textView.setText(Integer.toString(i));
You can use the empty string literal: textView.setText("" + i);
I prefer the last option. With your code, it should looks like the following code:
private void count() {
TextView textView=(TextView)findViewById(R.id.textView);
int i;
i=1;
while(i<10) {
i++;
textView.setText("" + i);
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
You can use a for loop instead of a while loop, like the following code:
private void count() {
TextView textView=(TextView)findViewById(R.id.textView);
for(int i = 1; i < 11; i++){ // From 1 to 10
textView.setText("" + i);
Thread.sleep(200);
}
}
Use a CountDown because you are blocking the main thread
CountDownTimer countDownTimer = new CountDownTimer(2000 /*amount*/, 200/*step*/) {
public void onTick(long millisUntilFinished) {
textView.setText("what ever you want");
}
public void onFinish() {
textView.setText("Done");
}
};
countDownTimer.start();