Question

我需要在8.47秒后更改textview 8次，然后再更改8次，但仅在8.00秒后更改。请帮助，因为我不确定如何编码。

我试过寻找代码，但它没有帮助如何做到这一点。这是我到目前为止所拥有的。

public class Twenty_Meter_Test extends ActionBarActivity implements View.OnClickListener {

Chronometer myChronometer;
int level = 1;
int shuttle = 1;
int updates = 0;
String levels = level + "." + shuttle;
TextView textView = (TextView) findViewById(R.id.levelcount);


protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tweney__meter__test);

    myChronometer = (Chronometer) findViewById(R.id.chronometer);

    (findViewById(R.id.start_twenty)).setOnClickListener(this);
    (findViewById(R.id.stop_twenty)).setOnClickListener(this);




}

public void onClick (View view) {
    textView.setText(levels);

    switch (view.getId()) {
        case R.id.start_twenty: {

            myChronometer.setBase(SystemClock.elapsedRealtime());
            myChronometer.start();

            break;
        }
        case R.id.stop_twenty: {
            myChronometer.stop();
            break;
        }

    }
}

public void updateTextView () {
    if (updates < 8) {
        updates++;
        level++;
        textView.postDelayed(new Runnable() {
            @Override
        public void run() {
                level++;
                textView.setText(levels);
                updateTextView();
            }
        }, 8470);
    }
    level = 0;
    shuttle = 2;
    if (updates > 8 && updates < 16) {
        updates++;

        textView.postDelayed(new Runnable() {
            @Override
            public void run() {
                level++;
                updateTextView();
            }
        }, 8000);
    }
}

Answer 1

不要使用Chronometer，试试这个

*创建全局变量和对象

private Handler mHandler = new Handler();
private long timeUnformatted = 0L;
private long timeInMilliseconds = 0L;
private long timeSwapBuff = 0L;
private long updatedTime = 0L;

*使用runnable

private Runnable updateTimerMethod = new Runnable() {

    public void run() {
        timeInMilliseconds = SystemClock.uptimeMillis() - timeUnformatted;
        updatedTime = timeSwapBuff + timeInMilliseconds;

        seconds = (int) (updatedTime / 1000);
        minutes = seconds / 60;
        seconds = seconds % 60;
        ms = (int) (updatedTime % 1000);

        if (seconds == 8) {
            // do something
        }   
    }
};

在onCreate（）中启动计时器添加

mHandler.postDelayed(updateTimerMethod, 0);

停止计时器添加

mHandler.removeCallbacks(updateTimerMethod);

在onPause（）中添加

timeSwapBuff += timeInMilliseconds;
mHandler.removeCallbacks(updateTimerMethod);

*在onResume（）中再次开始

在一定时间后更改TextView N次

1 个答案: