停止视图闪烁的线程

时间:2014-01-06 12:20:36

标签: android

我有一个函数,如果接受为true,则启动线程以闪烁视图,但如果收到错误,如何停止它?

private void blinkText(boolean b){

    final Handler handler = new Handler();

    if(b)
    {
        new Thread(new Runnable() {
            @Override
            public void run() {
            int timeToBlink = 1000;    //in ms
            try{
                Thread.sleep(timeToBlink);
            }catch (Exception e) {

            }
            handler.post(new Runnable() {
                @Override
                    public void run() {
                    TextView txt = (TextView) findViewById(R.id.tv);
                    if(txt.getVisibility() == View.VISIBLE){
                        txt.setVisibility(View.INVISIBLE);
                    }else{
                        txt.setVisibility(View.VISIBLE);
                    }
                    blinkText(true);
                }
                });
            }}).start();
    }

    else
    {
        // stop blinking
    }

}

2 个答案:

答案 0 :(得分:2)

您可以在xml中定义闪烁动画,并在初始化后将其添加到textview中:

<强> RES /动画/ blink.xml

<?xml version="1.0" encoding="utf-8"?>
<alpha
    android:fromAlpha="0"
    android:toAlpha="1"
    android:duration="200"
    android:repeatMode="reverse"
    android:repeatCount="infinite"
    xmlns:android="http://schemas.android.com/apk/res/android">

</alpha>

添加动画进行观看:

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

        TextView textView = (TextView) this.findViewById(R.id.textview);
        Animation blink = AnimationUtils.loadAnimation(this, R.anim.blink);
        textView.setAnimation(blink);
    }

开始:

textView.getAnimation().start()

停止:

textView.getAnimation().cancel()
textView.getAnimation().reset()

答案 1 :(得分:0)

您需要创建一个布尔字段作为类成员(boolean mStopBlink = false;)并跟踪TextView当前是否闪烁:

txt.setVisibility(View.VISIBLE);
if(!mStopBlink){
    txt.setVisibility(View.INVISIBLE);