上传文件至 'Android/Demo1'

适用于RecyclerView的右侧半透明遮罩demo

Android/Demo1/RightGradual.java

@@ -0,0 +1,55 @@
+package com.yunbao.live.custom;
+
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Shader;
+import android.graphics.Xfermode;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+/**
+ * Created by cxf on 2018/1/27.
+ * RecyclerView右側渐变的itemDecoration
+ */
+
+public class RightGradual extends RecyclerView.ItemDecoration {
+
+    private Paint mPaint;
+    private Xfermode mXfermode;
+    private LinearGradient mLinearGradient;
+    private int mLayerId;
+
+    public RightGradual() {
+        mPaint = new Paint();
+        mXfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_IN);
+        mLinearGradient = null;
+    }
+
+    @Override
+    public void onDrawOver(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
+        super.onDrawOver(canvas, parent, state);
+        float left=parent.getRight()-parent.getRight()/0.1f;
+        float top=0f;
+        float right=parent.getRight();
+        float bottom=parent.getBottom();
+        if(mLinearGradient==null){
+            mLinearGradient=new LinearGradient(parent.getMeasuredWidth(), 0.0f, 0.0f, 0.0f, new int[]{0, Color.BLACK}, new float[]{0.0f,0.2f}, Shader.TileMode.CLAMP);
+        }
+        mPaint.setXfermode(mXfermode);
+        mPaint.setShader(mLinearGradient);
+        //mPaint.setColor(Color.BLUE);
+        canvas.drawRect(left, top,right, bottom, mPaint);
+        mPaint.setXfermode(null);
+        canvas.restoreToCount(mLayerId);
+    }
+
+    @Override
+    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
+        super.onDraw(c, parent, state);
+        mLayerId = c.saveLayer(0.0f, 0.0f, (float) parent.getWidth(), (float) parent.getHeight(), mPaint, Canvas.ALL_SAVE_FLAG);
+    }
+}