java - 每秒更改 TextView 文本

Question

我没有找到多个 TextViews 的解决方案。我想在 Button 单击时每秒或 1/2 秒更改文本:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_2);

    Show = (TextView) findViewById(R.id.Show);
    Start = (Button) findViewById(R.id.Start);

    Start.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Show.setTextColor(android.graphics.Color.BLUE);
            SystemClock.sleep(1000);
            Show.setText("Example Text 1");
            SystemClock.sleep(1000);
            Show.setText("Example Text 2");
            SystemClock.sleep(300);
            Show.setText("Example Text 3");
            SystemClock.sleep(800);
            Show.setText("Example Text 4");
            SystemClock.sleep(5000);
            Show.setText("Example Text 5");
            SystemClock.sleep(1000);
            Show.setText("Example Text 6");
            SystemClock.sleep(2000);
            Show.setText("Example Text 7");
            SystemClock.sleep(100);
       }    
    });
 }

但这行不通。如果我单击 Button 则不会发生任何事情，随后 TextView 显示示例文本 7。

Answer 1

此代码从 5 倒数到 1(显示该值)，然后写入“GO!”

final TextView txtCount = (TextView) findViewById(R.id.txtCount);

final int secs = 5;
new CountDownTimer((secs + 1) * 1000, 1000) // Wait 5 secs, tick every 1 sec
{
    @Override
    public final void onTick(final long millisUntilFinished)
    {
        txtCount.setText("" + (int) (millisUntilFinished * .001f));
    }
    @Override
    public final void onFinish()
    {
        txtCount.setText("GO!");
    }
}.start();

它假设您当前的 ContentView 布局中有一个名为 txtCount 的 TextView