我正在创建一个问答应用程序。我希望在用户单击答案后立即出现正确/错误的动画,然后在 3 秒后自动切换问题(淡入下一个问题)。我尝试使用 Thread.sleep(3000) 执行此操作,但整个程序卡住了。到目前为止,这是我的代码:
binding.buttonTrue.setOnClickListener(view -> {
checkAnswer(true);
updateQuestion();
//these two calls invoke right/wrong animation
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
changeTheQuestion();
//this invokes fade animation
});
如何在这两个动画之间添加一段时间?谢谢!
完整代码: 包 com.bawp.trivia;
import android.graphics.Color;
import android.media.AudioAttributes;
import android.media.SoundPool;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import com.bawp.trivia.data.Repository;
import com.bawp.trivia.databinding.ActivityMainBinding;
import com.bawp.trivia.model.Question;
import com.google.android.material.snackbar.Snackbar;
import java.util.ArrayList;
import java.util.List;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
public class MainActivity extends AppCompatActivity {
List<Question> questionList;
Handler mHandler;
private ActivityMainBinding binding;
private int currentQuestionIndex = 0;
SoundPool soundPool;
private int sound1, sound2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
questionList = new Repository().getQuestions(questionArrayList -> {
binding.questionTextview.setText(questionArrayList.get(currentQuestionIndex)
.getAnswer());
updateCounter(questionArrayList);
}
);
mHandler = new Handler();
binding.buttonNext.setOnClickListener(view -> {
currentQuestionIndex = (currentQuestionIndex + 1) % questionList.size();
updateQuestion();
});
binding.buttonTrue.setOnClickListener(view -> {
checkAnswer(true);
updateQuestion();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
changeTheQuestion();
}
}, 3000);
});
binding.buttonFalse.setOnClickListener(view -> {
checkAnswer(true);
updateQuestion();
new Handler().postDelayed(new Runnable() {
public void run() {
changeTheQuestion();
}
}, 3000);
});
AudioAttributes audioAttributes = new AudioAttributes.Builder()
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.setUsage(AudioAttributes.USAGE_ASSISTANCE_SONIFICATION)
.build();
soundPool = new SoundPool.Builder()
.setMaxStreams(4)
.setAudioAttributes(audioAttributes)
.build();
sound1 = soundPool.load(this, R.raw.correct, 1);
sound2 = soundPool.load(this, R.raw.wrong, 1);
}
private void checkAnswer(boolean userChoseCorrect) {
boolean answer = questionList.get(currentQuestionIndex).isAnswerTrue();
int snackMessageId = 0;
if (userChoseCorrect == answer) {
snackMessageId = R.string.correct_answer;
fadeAnimation();
soundPool.play(sound1, 1, 1, 0, 0, 1);
} else {
snackMessageId = R.string.incorrect;
shakeAnimation();
soundPool.play(sound2, 1, 1, 0, 0, 1);
}
Snackbar.make(binding.cardView, snackMessageId, Snackbar.LENGTH_SHORT)
.show();
}
private void updateCounter(ArrayList<Question> questionArrayList) {
binding.textViewOutOf.setText(String.format(getString(R.string.text_formatted),
currentQuestionIndex, questionArrayList.size()));
}
private void fadeAnimation() {
AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
alphaAnimation.setDuration(300);
alphaAnimation.setRepeatCount(1);
alphaAnimation.setRepeatMode(Animation.REVERSE);
binding.cardView.setAnimation(alphaAnimation);
alphaAnimation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
binding.questionTextview.setTextColor(Color.GREEN);
}
@Override
public void onAnimationEnd(Animation animation) {
binding.questionTextview.setTextColor(Color.WHITE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
}
private void changeTheQuestion() {
AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
alphaAnimation.setDuration(300);
alphaAnimation.setRepeatCount(1);
alphaAnimation.setRepeatMode(Animation.REVERSE);
binding.cardView.setAnimation(alphaAnimation);
alphaAnimation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
binding.questionTextview.setTextColor(Color.BLUE);
}
@Override
public void onAnimationEnd(Animation animation) {
currentQuestionIndex = (currentQuestionIndex + 1) % questionList.size();
updateQuestion();
binding.questionTextview.setTextColor(Color.WHITE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
}
private void updateQuestion() {
String question = questionList.get(currentQuestionIndex).getAnswer();
binding.questionTextview.setText(question);
updateCounter((ArrayList<Question>) questionList);
}
private void shakeAnimation() {
Animation shake = AnimationUtils.loadAnimation(MainActivity.this,
R.anim.shake_animation);
binding.cardView.setAnimation(shake);
shake.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
binding.questionTextview.setTextColor(Color.RED);
}
@Override
public void onAnimationEnd(Animation animation) {
binding.questionTextview.setTextColor(Color.WHITE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
}
}
库.java:
package com.bawp.trivia.data;
import android.util.Log;
import com.android.volley.Request;
import com.android.volley.toolbox.JsonArrayRequest;
import com.bawp.trivia.controller.AppController;
import com.bawp.trivia.model.Question;
import org.json.JSONException;
import java.util.ArrayList;
import java.util.List;
public class Repository {
ArrayList<Question> questionArrayList = new ArrayList<>();
String url = "https://raw.githubusercontent.com/curiousily/simple-quiz/master/script/statements-data.json";
public List<Question> getQuestions( final AnswerListAsyncResponse callBack) {
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET,
url, null, response -> {
for (int i = 0; i < response.length(); i++) {
try {
Question question = new Question(response.getJSONArray(i).get(0).toString(),
response.getJSONArray(i).getBoolean(1));
//Add questions to arraylist/list
questionArrayList.add(question);
//Log.d("Hello", "getQuestions: " + questionArrayList);
} catch (JSONException e) {
e.printStackTrace();
}
}
if (null != callBack) callBack.processFinished(questionArrayList);
}, error -> {
});
AppController.getInstance().addToRequestQueue(jsonArrayRequest);
return questionArrayList;
}
}
最佳答案
您不能在主 (UI) 线程上调用 Thread.sleep()
。这将卡住您的应用并导致您的应用因 ANR(应用无响应)错误而崩溃。
您可以只发布一个Runnable
,它会在一段时间后运行一段代码。像这样:
new Handler().postDelayed(new Runnable() {
public void run() {
changeTheQuestion();
}
}, 3000);
关于java - 你怎么能在java中的两个事件之间等待?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/67360538/