Java Android studio:检查对象状态
我有一个游戏,在屏幕上产生4个敌人从图像框,当计时器达到零,一个敌人在屏幕上产生。我想要一种不断检查敌人是否在屏幕上可见的方法 我的类当前包含用于检查可见性的while循环:Java Android studio:检查对象状态,java,android-studio,while-loop,Java,Android Studio,While Loop,我有一个游戏,在屏幕上产生4个敌人从图像框,当计时器达到零,一个敌人在屏幕上产生。我想要一种不断检查敌人是否在屏幕上可见的方法 我的类当前包含用于检查可见性的while循环: public class rear_gunner extends AppCompatActivity { int clickcount=0; CountDownTimer countDownTimer; int score = 0; int health2 = 100; @Override protected vo
public class rear_gunner extends AppCompatActivity {
int clickcount=0;
CountDownTimer countDownTimer;
int score = 0;
int health2 = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rear_gunner);
final TextView text = (TextView) findViewById(R.id.textView2);
final TextView scoreText = (TextView) findViewById(R.id.score);
final TextView health = (TextView) findViewById(R.id.Health);
health.setText("Health:"+ health2);
//Enemy ImageViews
final ImageView enemy1 = (ImageView) findViewById(R.id.enemy1);
final ImageView enemy2 = (ImageView) findViewById(R.id.enemy2);
final ImageView enemy3 = (ImageView) findViewById(R.id.enemy3);
final ImageView enemy4 = (ImageView) findViewById(R.id.enemy4);
//sets screen orientation on created
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
//sets imageViews into array
final ImageView[] enemies = new ImageView[4];
enemies[0] = enemy1;
enemies[1] = enemy2;
enemies[2] = enemy3;
enemies[3] = enemy4;
boolean running = true;
while (!running) {
if (enemy1.getVisibility() == View.VISIBLE) {
int damage = 1;
health2 = health2 - damage;
health.setText("Health:" + health2);
} else {
// Either gone or invisible
}
if (enemy2.getVisibility() == View.VISIBLE) {
int damage = 1;
health2 = health2 - damage;
health.setText("Health:" + health2);
} else {
// Either gone or invisible
}
if (enemy3.getVisibility() == View.VISIBLE) {
int damage = 1;
health2 = health2 - damage;
health.setText("Health:" + health2);
} else {
// Either gone or invisible
}
if (enemy4.getVisibility() == View.VISIBLE) {
int damage = 1;
health2 = health2 - damage;
health.setText("Health:" + health2);
} else {
// Either gone or invisible
}
}
上面的代码根本不起作用。当我开始活动时,屏幕变黑,直到关闭为止。这与我使用while循环运行的方式有关吗
我的计时器代码(如果需要):
//random number generator between 10-25
Random r = new Random();
int Low = 10000;
int High = 25000;
int Result = r.nextInt(High-Low) + Low;
//count down timer for spawing enemies
countDownTimer = new CountDownTimer(Result, 1000) {
@Override
public void onTick(long millisUntilFinished) {
text.setText("seconds remaining: " + millisUntilFinished / 1000);
if (score == 500)
{
countDownTimer.cancel();
}
}
@Override
public void onFinish() {
Random r = new Random();
int Low = 0;
int High = 4;
int Result = r.nextInt(High-Low) + Low;
enemies[Result].setVisibility(View.VISIBLE);
countDownTimer.start();
if (score == 500)
{
countDownTimer.cancel();
}
}
};
countDownTimer.start();
}
}
感谢您的帮助,如果您能提供更有效的建议,我们将不胜感激
boolean running = true;
while (!running) {
...
您的while循环永远不会运行,如果您想要刷新UI,您必须在另一个地方编写此代码,可能是后台计时器任务线程,或者使用
处理程序来处理此问题。有关如何执行此操作的任何帮助或资源?