您好，这是我第一次开发Android彩色游戏。但是我想在每个问题上进行3次试验。我有点困惑在我的代码中放置while循环的方式或位置。请看看我到目前为止所尝试的内容：
int trial = 0;
private void getCorrectObject() {
List<Integer> objects = new ArrayList<Integer>();
objects.add(1);
objects.add(2);
objects.add(3);
objects.add(4);
objects.add(5);
objects.add(6);
objects.add(7);
objects.add(8);
objects.add(9);
Collections.shuffle(objects);
int correctObject = objects.get(0);
Log.d("test", String.valueOf(correctObject));
while(trial <=3){
trial++;
switch(correctObject)
{
case 1:
bObjectCorrect.setImageResource(R.drawable.stage1_1_object1);
bObjectCorrect.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 2:
bObject1.setImageResource(R.drawable.stage1_1_object1);
bObject1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 3:
bObject2.setImageResource(R.drawable.stage1_1_object1);
bObject2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 4:
bObject3.setImageResource(R.drawable.stage1_1_object1);
bObject3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 5:
bObject4.setImageResource(R.drawable.stage1_1_object1);
bObject4.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 6:
bObject5.setImageResource(R.drawable.stage1_1_object1);
bObject5.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 7:
bObject6.setImageResource(R.drawable.stage1_1_object1);
bObject6.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 8:
bObject7.setImageResource(R.drawable.stage1_1_object1);
bObject7.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
case 9:
bObject8.setImageResource(R.drawable.stage1_1_object1);
bObject8.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), Stage1_2.class);
startActivity(i);
new Thread(){
public void run(){
MediaPlayer mp = MediaPlayer.create(Stage1_2.this, R.raw.brown);
mp.start();
}
}.start();
finish();
}
});
break;
} // Last of switch statement
if(trial == 3){
new AlertDialog.Builder(this)
.setTitle("Game Over")
.setMessage("Sorry you reached your 3rd trial")
.setPositiveButton("Try Again?", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent i = new Intent(Stage1_2.this, Stage1_1.class);
startActivity(i);
}
})
.setNegativeButton("Back to Menu", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent i = new Intent(Stage1_2.this, ShapingColors.class);
startActivity(i);
}
})
.show();
}
} // end of while loop
我真的很想完成这件事，所以我可以继续比赛。真的很感激任何帮助。提前谢谢。
我添加了一个名为 guessedWrong（）
的新方法 private void guessedWrong(){
trial++;
if(trial == 3){
new AlertDialog.Builder(this)
.setTitle("Game Over")
.setMessage("Sorry you reached your 3rd trial")
.setPositiveButton("Try Again?", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent i = new Intent(Stage1_1.this, Stage1_1.class);
startActivity(i);
}
})
.setNegativeButton("Back to Menu", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent i = new Intent(Stage1_1.this, ShapingColors.class);
startActivity(i);
}
})
.show();
}
}
答案 0 :(得分：3)
您感到困惑的原因是您无法使用循环执行此任务。使用Java Android框架时，每个回调函数（例如，onClick侦听器或Activity的{{1}}）必须在应用程序的一个帧内运行并完成。只有在函数返回后，您的应用才会更新屏幕。这意味着，如果您正在执行诸如响应一系列点击之类的操作，则无法在循环中执行此操作。您必须在单独的回调调用中处理每次单击。如果您想迭代项目列表以决定现在将会发生什么，那么onResume和for循环是合适的（例如，如果您要向while），但你不能迭代在不同时间发生的事情（例如用户的猜测）。
你必须考虑你的ListView状态机。将Activity设为trial的成员变量（字段），该变量从Activity开始。你可能有一个函数0增加guessedWrong()，如果它大于2，则进入“游戏结束”屏幕。错误答案的trial监听器将调用此函数。转到新问题时，请将onClick重置为trial。
如果0重新启动，您还需要确保保留试用次数（表明您所处的状态）。 Google提供的Recreating an Activity课程Android Developers' Training向您展示了如何执行此操作。