如何进行对图片的切割

旧城等待， 2022-07-16 10:54 334阅读 0赞

一：要达到的效果

![Center][]

二：布局使用了GridLayout（五列三行）

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.kirito.puzzlegame.MainActivity">
    
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">
    
            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="match_parent">
    
                <GridLayout
                    android:id="@+id/gl"
                    android:columnCount="3"
                    android:rowCount="5"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"/>
            </HorizontalScrollView>
    
        </ScrollView>
    
    
    </RelativeLayout>

三：以二维数组来表示图片切割的各个部分，使用createBitmap方法切割图片，使用gridlayout的addview方法把图片块添加进去

package com.example.kirito.puzzlegame;
    
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.drawable.BitmapDrawable;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.view.animation.Animation;
    import android.view.animation.RotateAnimation;
    import android.view.animation.TranslateAnimation;
    import android.widget.GridLayout;
    import android.widget.ImageView;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
        private ImageView ivs[][] = new ImageView[5][3];
        private GridLayout gl;
    
        private ImageView null_iv;
    
        private static final String TAG = "MainActivity";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            gl = (GridLayout) findViewById(R.id.gl);
            //从drawable下获取图片资源并将其转为bitmap
            Bitmap bm = ((BitmapDrawable)getResources().getDrawable(R.drawable.a)).getBitmap();
            int bm_height = bm.getHeight() / 5;
            int bm_width = bm.getWidth() / 3;
            for (int i = 0; i < ivs.length; i++) {
                for (int j = 0; j < ivs[0].length; j++) {
                    ivs[i][j] = new ImageView(this);
                    //通过bitmap的createBitmap方法来切割图片，把完整图片分割成五行三列
                    /**
                     * createBitmap方法解析
                     * Bitmap.createBitmap(source, 60, 0, 480, 260); // 320 - 60 = 260
                     Basically, you are drawing from x = 60, y = 0 to x = 480 + 60, y = 260 on a Bitmap
                     */
                    //完整分割图片
                    Bitmap bp = Bitmap.createBitmap(bm,j * bm_width,i * bm_height,bm_width,bm_height);
                    ivs[i][j].setImageBitmap(bp);
                    //这种均等切割为正方形的方式，最终只会显示原图的一部分，即把原图左上角部分的正方形切割下来，其他的就舍弃了
                    /*Bitmap bp = Bitmap.createBitmap(bm,j * bm_height,i * bm_height,bm_height,bm_height);
                    ivs[i][j].setImageBitmap(bp);*/
                    ivs[i][j].setPadding(2,2,2,2);
    
                    
                }
            }
    
            for (int i = 0; i < ivs.length; i++) {
                for (int j = 0; j < ivs[0].length; j++) {
                    //通过给gridview添加切割好的小图片
                    gl.addView(ivs[i][j]);
                }
            }
            
        }
    
        
    }

[Center]: /images/20220716/110dca07025640c288d9cd8eb5a12e3d.png