Android – 使ImageView“闪烁”

我想让我的ImageView看起来闪烁。 更确切地说,就像一个button点击事件,我想要一个ImageView更改其src 1秒,然后改变回来,然后再等。然后它应该停止,和ImageView应该有以前相同的src。 我试图根据另一个问题做一些事情,但是这不起作用。

private class MyHandler extends Handler { public ImageView imgView; @Override public void handleMessage(Message msg) { if (imgView != null) { switch (msg.what) { case 0: imgView.setImageResource(R.drawable.red_img); break; case 1: imgView.setImageResource(R.drawable.white_img); break; } } super.handleMessage(msg); } } (...) MyHandler blinker = new MyHandler(); blinker.imgView = imgView; for (int j = 0; j < 5; j++) { Message msg = new Message(); if (j % 2 == 0) { msg.what = 0; } else { msg.what = 1; } blinker.sendMessageDelayed(msg, j * 300); } 

有谁知道如何做到这一点(如果可以做到的话)。 谢谢!

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或者你可以通过在xml中定义它来简单地使用AnimationDrawable :

 <animation-list android:id="@+id/selected" android:oneshot="false"> <item android:drawable="@drawable/state1" android:duration="1000" /> <item android:drawable="@drawable/state2" android:duration="1000" /> </animation-list> 

并调用start()

 ImageView img = (ImageView)findViewById(R.id.spinning_wheel_image); img.setImageResource(R.drawable.my_blinking_drawable); AnimationDrawable frameAnimation = (AnimationDrawable) img.getDrawable(); frameAnimation.start(); 

下面的代码将在屏幕上放置一个ImageView,当点击ImageView时,它将在两个不同的图像之间闪烁5秒钟:

 int numberOfTimesToBlink = 4; long blinkInterval = 1000; // 1 second final ImageView blinkingImageView = (ImageView)findViewById(R.id.blinkingImageView); // setBackgroundDrawable is deprecated but it still works, and the newer method (setBackground) has min API level of 16 blinkingImageView.setBackgroundDrawable(getResources().getDrawable(R.drawable.yourFirstImage)); blinkingImageView.setTag("yourFirstImage"); final CountDownTimer blinkTimer = new CountDownTimer((numberOfTimesToBlink+1)*1000, blinkInterval) { @Override public void onTick(long millisUntilFinished) { if (blinkingImageView.getTag() == "yourFirstImage") { blinkingImageView.setBackgroundDrawable(getResources().getDrawable(R.drawable.yourSecondImage)); blinkingImageView.setTag("yourSecondImage"); } else if (blinkingImageView.getTag() == "yourSecondImage") { blinkingImageView.setBackgroundDrawable(getResources().getDrawable(R.drawable.yourFirstImage)); blinkingImageView.setTag("yourFirstImage"); } } @Override public void onFinish() { } }; blinkingImageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { blinkTimer.start(); } }); 

和XML文件:

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <ImageView android:id="@+id/blinkingImageView" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout> 

您只需更改临时源图像并启动计时器1秒钟,然后再次显示原始图像:

 image.setOnClickListener(new View.OnClickListener() { @Override public void onClick(final View v) { ImageView img = (ImageView) v; img.setImageResource(R.drawable.temporary_image); Timer t = new Timer(); t.schedule(new TimerTask() { @Override public void run() { runOnUiThread(new Runnable() { @Override public void run() { img.setImageResource(R.drawable.main_image) } }); } }, 1000); } }); 
 <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:interpolator="@android:anim/accelerate_interpolator" android:duration="600" android:repeatMode="reverse" android:repeatCount="infinite"/> </set> 

或者看看这个

链接