Android-使用Handler Runnable显示视图

Question

我正在为自己创建的练习应用程序创建一个简单的启动屏幕。 我有一堆不可见的图像，我想在使用Handler Runnable设置的5秒钟延迟后显示这些图像。 到目前为止，这是我的代码：

    long secondsDelayed = 5;

    new Handler().postDelayed(new Runnable() {  
        @Override
        public void run() {
            //I want to display this images in 2 second count
            ivLogoText.setVisibility(View.VISIBLE);
            ivLogoStem.setVisibility(View.VISIBLE);

            //I want to display this image in 3 second count
            ivSmLeaves.setVisibility(View.VISIBLE);

            //I want to display this image in 4 second count
            ivMedLeaves.setVisibility(View.VISIBLE);

            //I want to display this image in 5 second count
            ivLargeLeaves.setVisibility(View.VISIBLE);

            startActivity(new Intent(SplashScreen.this, HomeLeftPanel.class));
            finish();
        }
    }, (long) (secondsDelayed * 1000));
}

从我现在的代码中，启动屏幕停留5秒钟，这正是我想要的，但是所有图像也将在5秒内显示出来。 有人可以帮我弄这个吗？

Answer 1

这是因为您要同时更改所有图像的可见性。

与此相反，您应该使用“查看动画师”

http://developer.android.com/reference/android/widget/ViewAnimator.html

Answer 2

当您要在2秒，3秒，4秒，5秒显示不同的图像时，您需要在交错的时间发布多个此类可运行对象。 或者，您可以使用倒数计时器，在其中可以计算滴答声的数量并执行不同的操作。

如果要使用您的方法：

new Handler().postDelayed(new Runnable() {  
        @Override
        public void run() {
            //I want to display this images in 2 second count
            ivLogoText.setVisibility(View.VISIBLE);
            ivLogoStem.setVisibility(View.VISIBLE);
 }
    }, (long) (2 * 1000));

 new Handler().postDelayed(new Runnable() {  

            //I want to display this image in 3 second count
            ivSmLeaves.setVisibility(View.VISIBLE);
 }
    }, (long) (3 * 1000));

new Handler().postDelayed(new Runnable() {  

            //I want to display this image in 4 second count
            ivMedLeaves.setVisibility(View.VISIBLE);
    }, (long) (4 * 1000));

new Handler().postDelayed(new Runnable() {  

            //I want to display this image in 5 second count
            ivLargeLeaves.setVisibility(View.VISIBLE);

            startActivity(new Intent(SplashScreen.this, HomeLeftPanel.class));
            finish();
        }
    }, (long) (5 * 1000));

Answer 3

您可以在线程的Runnable中使用Thread和Sleep 。 在Thread内部，您可以使用Activity的runOnUiThread函数更改UI（您的图像视图），如下所示：

  new Thread(new Runnable() {

        @Override
        public void run() {
            try {
                Thread.sleep(2000); // wait 2s
                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        //show hide image view here.
                    }
                });
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }).start();

Answer 4

试试这个

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                switch (step) {
                    case 1:
                        //I want to display this images in 2 second count
                        ivLogoText.setVisibility(View.VISIBLE);
                        ivLogoStem.setVisibility(View.VISIBLE);
                        break;
                    case 2:
                        //I want to display this image in 3 second count
                        ivSmLeaves.setVisibility(View.VISIBLE);
                        break;
                    case 3:
                        //I want to display this image in 4 second count
                        ivMedLeaves.setVisibility(View.VISIBLE);
                        break;
                    case 4:
                        //I want to display this image in 5 second count
                        ivLargeLeaves.setVisibility(View.VISIBLE);
                        break;
                    case 5:
                        startActivity(new Intent(SplashScreen.this, HomeLeftPanel.class));
                        finish();
                        return;// there is no more step
                    case 0:
                        // TODO: do something afeter 1 second
                    default:
                }
                ++ step;
                // reserve next step
                handler.postDelayed(this, 1000);
            }
        }, 1000);