Question

我想让我的ImageView显示为闪烁。更确切地说，在按钮单击等事件上，我希望ImageView将其src更改1秒，然后再更改，然后再更改等等。然后它应该停止，并且ImageView应该具有与之前相同的src。我试图根据另一个问题做一些事情，但它不起作用......

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（如果可以的话）。谢谢！

Answer 1

或者您可以通过在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>

并在其上调用start()：

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

Answer 2

以下代码将在屏幕上放置一个ImageView，当单击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>

Answer 3

您只需更改临时源图像并启动计时器1秒钟，之后可以再次显示原始图像：

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);
    }
});

Answer 4

<?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>

或看看这个

link

Android - 让ImageView“闪烁”

4 个答案: