Bootstrap 进度条未在 android 内递增

Question

我有以下代码，我想用它来缓慢增加我的进度条 20 秒

    public void progressAnimator(){
    final long period = 1000;
    timer=new Timer();
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            //this repeats every 100 ms
            if (counter<100){
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        loaderLabel.setText(String.valueOf(counter)+"%");
                    }
                });
                mProgress.setProgress(counter);
                counter++;
            }
            else{
                //closing the timer
                timer.cancel();
                Intent intent =new Intent(SplashActivity.this,MainActivity.class);
                startActivity(intent);
                // close this activity
                finish();
            }
        }
    }, period);
}

我的问题是，这最终只会在 loaderLabel 上指示 0%，然后在不执行任何操作的情况下冻结。我之前曾尝试过此代码，但它仅在 loaderLabel 上闪烁 100% 并填充进度条，然后继续进行到下一个 window.

     public void progressAnimator(){
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            for( counter =1; counter<=100; counter ++) {
                System.out.println(counter);
                mProgress.setProgress(counter);
                loaderLabel.setText(getResources().getString(R.string.loading) + " " + counter + " " + getResources().getString(R.string.percentSymbol));
                if (counter == 100) {
                    Toast.makeText(SplashActivity.this, R.string.welcome, Toast.LENGTH_LONG).show();
                    Intent loadMain = new Intent(SplashActivity.this, MainActivity.class);
                    startActivity(loadMain);
                    finish();
                }
            }
        }
    }, 100);

}

如果我将延迟增加到 20,000 然后它冻结在零，我可能做错了什么？

Answer 1

public void progressAnimator(){
    final long period = 1000;
    timer=new Timer();
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            //this repeats every 100 ms
            if (counter<100){
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        loaderLabel.setText(String.valueOf(counter)+"%");
                    }
                });
                mProgress.setProgress(counter);
                counter++;
            } else{
                //closing the timer
                timer.cancel();
                Intent intent =new Intent(SplashActivity.this,MainActivity.class);
                startActivity(intent);
                // close this activity
                finish();
            }
        }
    }, period);
}

在您的第一个代码片段中，您实例化了一个 Timer 对象，但您没有使用它来设置计时器。此外，在您的 Handler 实例中，没有循环可以确保 counter 不断增加。另外，如果有一个循环来增加 counter，就像您之前的代码

public void progressAnimator(){
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            for( counter =1; counter<=100; counter ++) {
                System.out.println(counter);
                mProgress.setProgress(counter);
                loaderLabel.setText(getResources().getString(R.string.loading) + " " + counter + " " + getResources().getString(R.string.percentSymbol));
                if (counter == 100) {
                    Toast.makeText(SplashActivity.this, R.string.welcome, Toast.LENGTH_LONG).show();
                    Intent loadMain = new Intent(SplashActivity.this, MainActivity.class);
                    startActivity(loadMain);
                    finish();
                }
            }
        }
    }, 100);
}

您的循环的整个 100 次迭代是在瞬间执行的，因为没有 SLEEP 调用使循环实际等待 100 毫秒。您可以通过添加来解决这个问题 Thread.sleep(100) 在循环结束之前。但是，不建议这样做，因为它会导致整个 UI 线程被阻塞 100 毫秒。所以我建议你使用 CountDownTimer 来解决这个问题。

你可以这样使用它：

new CountDownTimer(total_duration, duration_of_one_step) {
    public void onTick(long millisUntilFinished) {
        mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
        // Write code to be executed on every iteration here
    }

    public void onFinish() {
        mTextField.setText("done!");
        // Write code to be executed on completing the timer here
    }
}.start();

在你的例子中，total_duration = 20000 和 duration_of_one_step = 1000。

Answer 2

根据Kumar Harsh的回答，我建议你做以下事情

 public void progressAnimator(){
    new CountDownTimer(total_duration, duration_of_one_step) {
        public void onTick(long millisUntilFinished) {
            // code to be executed on every iteration
            loaderLabel.setText(MessageFormat.format("{0} {1} {2}", getResources().getString(R.string.loading), ((total_duration - millisUntilFinished) / 1000) * 5, getResources().getString(R.string.percentSymbol)));
            mProgress.setProgress((int) ((total_duration - millisUntilFinished) / 1000)*5);
        }
        public void onFinish() {
            //code to be executed on completing the timer
            Toast.makeText(SplashActivity.this, R.string.welcome, Toast.LENGTH_LONG).show();
            Intent loadMain = new Intent(SplashActivity.this, MainActivity.class);
            startActivity(loadMain);
            finish();
        }
    }.start();
}

这应该可以解决您的问题，请注意，我乘以 5 使进度达到 100，否则它会停在 20

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