到目前为止,我有下面的java代码。 我是Java的新手。 我希望能够将最大计数设置为 500,之后计数返回到"0",您可以再次开始计数。
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
import android.widget.EditText;
public class wazeefa extends Activity
{
TextView txtCount;
Button btnCount;
int count = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.wazeefa);
//button sound
final MediaPlayer mpButtonClick = MediaPlayer.create(this, R.raw.countbutton);
txtCount = (TextView)findViewById(R.id.wcount);
txtCount.setText(String.valueOf(count));
btnCount = (Button)findViewById(R.id.wclick);
btnCount.setOnClickListener(new OnClickListener()
{
public void onClick(View V)
{
count++;
txtCount.setText(String.valueOf(count));
mpButtonClick.start();
}
});
}
}
使用 %(modolus/reminder) 运算符。
count = (count + 1) % 500; //count will be in range [0,499] inclusive
或者,如果您还想允许 500
:count = (count + 1) % 501; //count will be in range [0,500] inclusive
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
import android.widget.EditText;
public class wazeefa extends Activity{
TextView txtCount;
Button btnCount;
int count = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.wazeefa);
//button sound
final MediaPlayer mpButtonClick = MediaPlayer.create(this, R.raw.countbutton);
txtCount = (TextView)findViewById(R.id.wcount);
txtCount.setText(String.valueOf(count));
btnCount = (Button)findViewById(R.id.wclick);
btnCount.setOnClickListener(new OnClickListener() {
public void onClick(View V) {
count++;
txtCount.setText(String.valueOf(count));
mpButtonClick.start();
if (count >= 500) {
count = 0;
}
}
});
}}
if(count > 500) {
count = 0;
}
这是 if 语句,基本上括号内的代码只有在顶部所说的内容为真时才会执行。它是编程的面包和黄油,如果你是Java的新手,你的代码没有半点坏处。