java - 如何在按下按钮后延迟一行代码

Question

我是 Java 新手，正在尝试在用户按下按钮后延迟一行代码。该代码行递增一个数组，i++。我想这样做的原因是因为我通过淡入淡出两个 TextView 来为其设置动画。一个 textView 淡出，而另一个淡入，我试图通过仅在它们具有相同的 Alpha(动画设置持续时间的一半 500)后增加我的数组索引来更改正在显示的单词。我在网上查看过，我有看到一些建议使用 swing 计时器，还有一些建议使用 thread.sleep。有什么建议么？这是该按钮的代码:)。

public void nextWord(View view) { //nextWord is the onclick of the button


        Button nextButton = findViewById(R.id.nextButton);
        Button showTextButton = findViewById(R.id.showTextButton);
        TextView wordTextView = findViewById(R.id.wordTextView);
        EditText editTextView = findViewById(R.id.enterEditText);
        ImageView logoImageView = findViewById(R.id.logoImageView);
        TextView wordTextView1 = findViewById(R.id.wordTextView1);


        i++; // need to delay this


        String displayHint;
        String displayText;

        displayText = enterWord() + chooseArray();
        displayHint = chooseArray();

        wordTextView.setText(displayText);
        editTextView.setHint(displayHint);
        wordTextView1.setText(displayText) ;



        enteredWords[i] = editTextView.getText().toString();

        if (i%2 == 0) {
            ObjectAnimator alphaAnimation = ObjectAnimator.ofFloat(wordTextView, View.ALPHA, 1f, 0f);
            alphaAnimation.setDuration(1000);
            ObjectAnimator otherAlphaAnimation = ObjectAnimator.ofFloat(wordTextView1, View.ALPHA, 0f, 1f);
            otherAlphaAnimation.setDuration(1000);

            AnimatorSet animatorSet = new AnimatorSet();
            animatorSet.playTogether(otherAlphaAnimation,alphaAnimation);
            animatorSet.start();

        } else {
            ObjectAnimator alphaAnimation = ObjectAnimator.ofFloat(wordTextView, View.ALPHA, 0f, 1f);
            alphaAnimation.setDuration(1000);
            ObjectAnimator otherAlphaAnimation = ObjectAnimator.ofFloat(wordTextView1, View.ALPHA, 1f, 0f);
            otherAlphaAnimation.setDuration(1000);

            AnimatorSet animatorSet = new AnimatorSet();
            animatorSet.playTogether(otherAlphaAnimation,alphaAnimation);
            animatorSet.start();
        }


    }

Answer 1

尝试使用

new Handler().postDelayed(Runnable r, long delay)

像这样使用

new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            // fade in new text view
                        }
                    }, 1000);   // time needed for first animation to finish

现在，当第一个动画需要 1000 毫秒完成时，第二个动画也会在 1000 毫秒后开始。您可以将其放入 final 值中以立即操纵这些延迟以保持它们同步