图片的缩放旋转和平移

Posted 2020-07-03 zhongyinghe

1、视图

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     tools:context=".MainActivity" >
 7 
 8     <ImageView
 9         android:id="@+id/iv_1"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         />
13     
14     <ImageView
15         android:id="@+id/iv_2"
16         android:layout_width="wrap_content"
17         android:layout_height="wrap_content"
18          />
19 
20 </LinearLayout>

2、代码

 1 package com.example.imageresize;
 2 
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.graphics.Bitmap;
 6 import android.graphics.BitmapFactory;
 7 import android.graphics.Canvas;
 8 import android.graphics.Color;
 9 import android.graphics.Matrix;
10 import android.graphics.Paint;
11 import android.view.Menu;
12 import android.widget.ImageView;
13 
14 public class MainActivity extends Activity {
15 
16     private ImageView iv_1;
17     private ImageView iv_2;
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         
23         iv_1 = (ImageView) findViewById(R.id.iv_1);
24         iv_2 = (ImageView) findViewById(R.id.iv_2);
25         
26         Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
27         iv_1.setImageBitmap(bitmap1);
28         
29         Bitmap alterBitmap = Bitmap.createBitmap(bitmap1.getWidth() + 10, bitmap1.getHeight() + 10, bitmap1.getConfig());
30         Canvas canvas = new Canvas(alterBitmap);
31         Paint paint = new Paint();
32         paint.setColor(Color.BLACK);
33         Matrix matrix = new Matrix();
34         /***************图片缩放代码start******************/
35         //注意x轴和y轴的缩放
36        /* matrix.setValues(new float[]{
37                 2.0f,0,1,
38                 0,1,0,
39                 0,0,1
40         });*/
41         //matrix.setScale(2.0f, 1);
42         /***************图片缩放代码end******************/
43         //matrix.setRotate(180, bitmap1.getWidth()/2, bitmap1.getHeight()/2);
44         //matrix.setRotate(15);
45         /***********镜子效果start*************/
46         matrix.setScale(-1, 1);
47         matrix.postTranslate(bitmap1.getWidth(), 0);//这样设置就是平移
48         /***********镜子效果end*************/
49         //matrix.setTranslate(10, 10);//x和y轴移动10个像素
50         //以bitmap1为模板画进画布中
51         canvas.drawBitmap(bitmap1, matrix, paint);
52         iv_2.setImageBitmap(alterBitmap);
53     }
54 
55 
56     
57 }