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  • Android 仿微信朋友圈点击图片变暗

    package cn.eoe.leigo.view;
    
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Paint;
    import android.graphics.RectF;
    import android.graphics.drawable.BitmapDrawable;
    import android.graphics.drawable.Drawable;
    import android.graphics.drawable.StateListDrawable;
    import android.util.AttributeSet;
    import android.view.View;
    import android.widget.ImageView;
    
    public class MaskImageView extends ImageView {
    
      public MaskImageView(Context context) {
        super(context);
      }
    
      public MaskImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
      }
    
      public MaskImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
      }
    
      @Override
      public void setImageBitmap(Bitmap bm) {
        Drawable d = createStateDrawable(getContext(), new BitmapDrawable(getContext().getResources(), bm));
        setImageDrawable(d);
      }
    
      public StateListDrawable createStateDrawable(Context context, Drawable normal) {
        StateListDrawable drawable = new StateListDrawable();
        drawable.addState(View.PRESSED_ENABLED_STATE_SET, createPressDrawable(normal));
        drawable.addState(View.ENABLED_STATE_SET, normal);
        drawable.addState(View.EMPTY_STATE_SET, normal);
        return drawable;
      }
    
      public Drawable createPressDrawable(Drawable d) {
        Bitmap bitmap = ((BitmapDrawable) d).getBitmap().copy(Bitmap.Config.ARGB_8888, true);
        Paint paint = new Paint();
        paint.setColor(0x60000000);
        RectF rect = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());
        new Canvas(bitmap).drawRoundRect(rect, 4, 4, paint);
        return new BitmapDrawable(getContext().getResources(), bitmap);
      }
    
    }
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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/5909884.html
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