我有一个倒计时器,如果用户在第12秒内没有点击游戏按钮,我想调用gameOver方法。
问题是当倒计时器为12时,游戏功能要么立即被调用,要么计时器继续倒计时。
因此,我尝试使用postDelayed()方法来给用户一秒钟的时间来点击按钮并让倒计时器继续,但是按照我的代码,游戏无论如何都会在12停止。
import android.app.Activity;
import android.os.CountDownTimer;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class GameScreen extends Activity {
private TextView time;
private Button start;
private Button cancel;
private Button gameButton;
private CountDownTimer countDownTimer;
public static int count = 0;
public static int countFail = 0;
final Handler handler = new Handler();
final Runnable r = new Runnable() {
public void run() {
handler.postDelayed(this, 1000);
gameOver();
}
};
private View.OnClickListener btnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.start_ID :
start();
break;
case R.id.cancel :
cancel();
break;
case R.id.gameButton_ID :
gameButton();
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_screen);
start = (Button) findViewById(R.id.start_ID);
start.setOnClickListener(btnClickListener);
cancel = (Button) findViewById(R.id.cancel);
cancel.setOnClickListener(btnClickListener);
time = (TextView) findViewById(R.id.time);
gameButton = (Button) findViewById(R.id.gameButton_ID);
gameButton.setOnClickListener(btnClickListener);
}
public void start() {
time.setText("16");
//This doesn't work and makes app crash when you hit start button
countDownTimer = new CountDownTimer(16 * 1000, 1000) {
@Override
public void onTick(long millsUntilFinished) {
time.setText("" + millsUntilFinished / 1000);
//turns textview string to int
int foo = Integer.parseInt(time.getText().toString());
if (time.getText().equals("12")) {
r.run();
}
}
public void onFinish() {
time.setText("Done !");
}
};
countDownTimer.start();
}
private void cancel() {
if(countDownTimer != null){
countDownTimer.cancel();
countDownTimer = null;
}
}
private void gameOver() {
Toast.makeText(getApplicationContext(), "You scored " + count, Toast.LENGTH_SHORT).show();
count = 0;
countFail = 0;
cancel();
}
private void gameButton() {
int foo = Integer.parseInt(time.getText().toString());
if(foo % 2 == 0 ) {
Toast.makeText(getApplicationContext(), "PASS", Toast.LENGTH_SHORT).show();
handler.removeCallbacks(r);
++count;
}
else {
gameOver();
}
}
}
gameOver()
不是每秒钟被调用无限次,而是被调用两次吗?看起来像是无限递归。 - starriet