如何隐藏发光效果？

Question

发光效果很好。我的疑问是如何隐藏发光效果？如果我点击我的imageview，那个时候我只希望显示我的发光效果，请点击时如何隐藏和显示发光效果。

代码：

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // An added margin to the initial image
        int margin = 24;
        int halfMargin = margin / 2;

        // the glow radius
        int glowRadius = 16;

        // the glow color
        int glowColor = Color.rgb(0, 192, 255);

        // The original image to use
        Bitmap src = BitmapFactory.decodeResource(getResources(),
                R.drawable.test);

        // extract the alpha from the source image
        Bitmap alpha = src.extractAlpha();

        // The output bitmap (with the icon + glow)
        Bitmap bmp = Bitmap.createBitmap(src.getWidth() + margin,
                src.getHeight() + margin, Bitmap.Config.ARGB_8888);

        // The canvas to paint on the image
        Canvas canvas = new Canvas(bmp);

        Paint paint = new Paint();
        paint.setColor(glowColor);

        // outer glow
        paint.setMaskFilter(new BlurMaskFilter(glowRadius, Blur.OUTER));
        canvas.drawBitmap(alpha, halfMargin, halfMargin, paint);

        // original icon
        canvas.drawBitmap(src, halfMargin, halfMargin, null);
        setContentView(R.layout.activity_main);

        ((ImageView) findViewById(R.id.bmpImg)).setImageBitmap(bmp);

    }
}

目前的截图：

Answer 1

您可以像这样设置setMaskFilter()的空值

paint.setMaskFilter(null);

，您只需设置paint.setMaskFilter(new BlurMaskFilter(glowRadius, Blur.OUTER));

即可

为此你需要为应用程序范围保留paint对象，这样这个paint对象可以在任何你想要的地方访问另一个类或活动，或者你可以设置为true的标志然后显示发光效果和false标志设置什么（默认）< / p>

Answer 2

设置onclicklistener并实现此代码：

.setOnClickListener(clicklistener);


private OnClickListener backListener = new OnClickListener() {
        public void onClick(View v) {
    // An added margin to the initial image
        int margin = 24;
        int halfMargin = margin / 2;

        // the glow radius
        int glowRadius = 16;

        // the glow color
        int glowColor = Color.rgb(0, 192, 255);

        // The original image to use
        Bitmap src = BitmapFactory.decodeResource(getResources(),
                R.drawable.test);

        // extract the alpha from the source image
        Bitmap alpha = src.extractAlpha();

        // The output bitmap (with the icon + glow)
        Bitmap bmp = Bitmap.createBitmap(src.getWidth() + margin,
                src.getHeight() + margin, Bitmap.Config.ARGB_8888);

        // The canvas to paint on the image
        Canvas canvas = new Canvas(bmp);

        Paint paint = new Paint();
        paint.setColor(glowColor);

        // outer glow
        paint.setMaskFilter(new BlurMaskFilter(glowRadius, Blur.OUTER));
        canvas.drawBitmap(alpha, halfMargin, halfMargin, paint);

        // original icon
        canvas.drawBitmap(src, halfMargin, halfMargin, null);
}}

Answer 3

更简单的方法是使用StateListDrawable。

创建两个图像 - 一个用于正常状态，一个用于按下状态（带有发光）。在res / drawable / button_drawable.xml中使用它：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:drawable="@drawable/image_normal"
        android:state_enabled="true"/>
    <item
        android:drawable="@drawable/image_pressed"
        android:state_pressed="true"/>
</selector>

并将其用作buttom drawable：

((ImageView) findViewById(R.id.bmpImg)).setImageDrawable(getResources().getDrawable(R.drawable.button_drawable));