把 Canvas.setMatrix() 改为 Canvas.concat()，避免有些机型中出现的显示问题。

Author: rengwuxian

app/src/main/java/com/hencoder/hencoderpracticedraw4/sample/Sample07MatrixTranslateView.java

@@ -43,14 +43,14 @@ protected void onDraw(Canvas canvas) {
         canvas.save();
         matrix.reset();
         matrix.postTranslate(-100, -100);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point1.x, point1.y, paint);
         canvas.restore();
 
         canvas.save();
         matrix.reset();
         matrix.postTranslate(200, 0);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point2.x, point2.y, paint);
         canvas.restore();
     }

app/src/main/java/com/hencoder/hencoderpracticedraw4/sample/Sample08MatrixScaleView.java

@@ -46,14 +46,14 @@ protected void onDraw(Canvas canvas) {
         canvas.save();
         matrix.reset();
         matrix.postScale(1.3f, 1.3f, point1.x + bitmapWidth / 2, point1.y + bitmapHeight / 2);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point1.x, point1.y, paint);
         canvas.restore();
 
         canvas.save();
         matrix.reset();
         matrix.postScale(0.6f, 1.6f, point2.x + bitmapWidth / 2, point2.y + bitmapHeight / 2);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point2.x, point2.y, paint);
         canvas.restore();
     }

app/src/main/java/com/hencoder/hencoderpracticedraw4/sample/Sample09MatrixRotateView.java

@@ -46,14 +46,14 @@ protected void onDraw(Canvas canvas) {
         canvas.save();
         matrix.reset();
         matrix.postRotate(180, point1.x + bitmapWidth / 2, point1.y + bitmapHeight / 2);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point1.x, point1.y, paint);
         canvas.restore();
 
         canvas.save();
         matrix.reset();
         matrix.postRotate(45, point2.x + bitmapWidth / 2, point2.y + bitmapHeight / 2);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point2.x, point2.y, paint);
         canvas.restore();
     }

app/src/main/java/com/hencoder/hencoderpracticedraw4/sample/Sample10MatrixSkewView.java

@@ -46,14 +46,14 @@ protected void onDraw(Canvas canvas) {
         canvas.save();
         matrix.reset();
         matrix.postSkew(0, 0.5f, point1.x + bitmapWidth / 2, point1.y + bitmapHeight / 2);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point1.x, point1.y, paint);
         canvas.restore();
 
         canvas.save();
         matrix.reset();
         matrix.postSkew(-0.5f, 0, point2.x + bitmapWidth / 2, point2.y + bitmapHeight / 2);
-        canvas.setMatrix(matrix);
+        canvas.concat(matrix);
         canvas.drawBitmap(bitmap, point2.x, point2.y, paint);
         canvas.restore();
     }