如何使ImageSwitcher每5秒切换一次图像?

时间:2013-12-14 13:10:59

标签: android timer imageview imageswitcher

我试图让ImageSwitcher每隔5秒更换一次图像..

我尝试使用Timer

Timer t = new Timer();
          //Set the schedule function and rate
          t.scheduleAtFixedRate(new TimerTask() {

              public void run() {
                  //Called each time when 1000 milliseconds (1 second) (the period parameter)
                  currentIndex++;
                // If index reaches maximum reset it
                 if(currentIndex==messageCount)
                     currentIndex=0;
                 imageSwitcher.setImageResource(imageIds[currentIndex]);
              }

          },0,5000);

但是我收到了这个错误:

logcat的:

12-14 15:07:29.963: E/AndroidRuntime(25592): FATAL EXCEPTION: Timer-0
12-14 15:07:29.963: E/AndroidRuntime(25592): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

2 个答案:

答案 0 :(得分:1)

Only the original thread that created a view hierarchy can touch its views.

计时器任务在不同的线程上运行。 Ui应该在ui线程上更新。

使用runOnUiThread

runOnUiThread(new Runnable() {

        public void run() {
         imageSwitcher.setImageResource(imageIds[currentIndex]);

        }
    });

您也可以使用Handler代替计时器。

编辑:

如果有帮助,请查看setBackgroundResource doesn't set the image

答案 1 :(得分:1)

Timer t = new Timer();
      //Set the schedule function and rate
      t.scheduleAtFixedRate(new TimerTask() {

          public void run() {
              //Called each time when 1000 milliseconds (1 second) (the period parameter)
              currentIndex++;
            // If index reaches maximum reset it
             if(currentIndex==messageCount)
                 currentIndex=0;
             runOnUiThread(new Runnable() {

                public void run() {
                   imageSwitcher.setImageResource(imageIds[currentIndex]);

                }
          });
          }

      },0,5000);