鸿蒙Java开发模式11：鸿蒙图片裁剪功能的实现

想了解更多内容，请访问：

51CTO和华为官方合作共建的鸿蒙技术社区

https://harmonyos.51cto.com

鸿蒙版图片裁剪功能，效果如下:

首页

图片裁剪区域:

裁剪结果：

Java代码实现如下:

package com.example.javahm9.slice; 
 
import com.example.javahm9.ResourceTable; 
import com.example.javahm9.util.CropImage; 
import ohos.aafwk.ability.AbilitySlice; 
import ohos.aafwk.content.Intent; 
import ohos.agp.colors.RgbColor; 
import ohos.agp.components.Button; 
import ohos.agp.components.Component; 
import ohos.agp.components.Text; 
import ohos.agp.components.element.ShapeElement; 
 
public class MainAbilitySlice extends AbilitySlice { 
 
    //定义一个图片 
    Component image; 
    //定义一个文本 
    Text text; 
 
    @Override 
    public void onStart(Intent intent) { 
        super.onStart(intent); 
        super.setUIContent(ResourceTable.Layout_ability_main); 
 
        //获取图片对象对应的component 
        image = findComponentById(ResourceTable.Id_result_image); 
 
         
        if(intent.getBooleanParam("cropFlag",false)){ 
            handleCrop(intent); 
        } 
         
        text = (Text) findComponentById(ResourceTable.Id_text); 
        if(intent.getIntParam("cropStatus",0) == 0){ 
            text.setText("欢迎使用"); 
        }else if(intent.getIntParam("cropStatus",0) == 1){ 
            text.setText("剪裁取消"); 
        }else if(intent.getIntParam("cropStatus",0) == 2){ 
            text.setText("剪裁成功"); 
        } 
 
 
        //获取button对象对应的component 
        Button button = (Button) findComponentById(ResourceTable.Id_button); 
        // 设置button的属性及背景 
        ShapeElement background = new ShapeElement(); 
       // background.setRgbColor(new RgbColor(125, 125, 255)); 
        background.setCornerRadius(25); 
       // button.setBackground(background); 
        if (button != null) { 
            // 绑定点击事件 
            button.setClickedListener(new Component.ClickedListener() { 
                public void onClick(Component v) { 
                    begincrop(); 
                } 
            }); 
        } 
    } 
 
    public void begincrop(){ 
        CropImage.activity() 
                .setContext(this) 
                .setSource(ResourceTable.Media_a9) 
                .setBundleName("com.example.javahm9") 
                .setAbilityName("com.example.javahm9.MainAbility") 
                .setRequset_code(1234) 
                .start(super.getAbility(),this); 
    } 
 
    //处理剪裁结果 
    private void handleCrop(Intent result) { 
        int resultImg = result.getIntParam("resultImg",0); 
        int result_code = result.getIntParam("result_code" , 0); 
        if(resultImg != 0){ 
            CropImage.handleImage(result_code , image); 
             
        } 
    } 
 
    @Override 
    public void onActive() { 
        super.onActive(); 
    } 
 
    @Override 
    public void onForeground(Intent intent) { 
        super.onForeground(intent); 
    } 
} 

裁剪工具类实现

package com.example.javahm9.util; 
 
import ohos.aafwk.ability.Ability; 
import ohos.aafwk.ability.AbilitySlice; 
import ohos.aafwk.content.Intent; 
import ohos.agp.components.Component; 
import ohos.agp.render.Canvas; 
import ohos.agp.render.Paint; 
import ohos.agp.render.PixelMapHolder; 
import ohos.app.Context; 
import ohos.media.image.PixelMap; 
import ohos.utils.net.Uri; 
 
 
 
public final class CropImage { 
 
    //存一个context 
    private static Context mContext; 
 
    //图片资源文件 
    private static int msource; 
 
    //裁减结果 
    public static final boolean CROPFLAG = true; 
 
    //空的构造器 
    private CropImage() { 
    } 
 
    //内部类初始化 
    public static ActivityBuilder activity() { 
        return new ActivityBuilder(null , null , null , 0); 
    } 
 
     
    public static void handleImage(int result, Component component) { 
 
        //203表示裁剪成功（203为自定义的数字） 
        if (result == 203) { 
            //获得原始位图 
            PixelMap pixelMap = BitmapUtils.getOriginalPixelMap(mContext , msource).get(); 
 
            //创建屏幕工具类 获得屏幕的宽度 
            CropWindowHandler windowHandler = new CropWindowHandler(mContext); 
 
             
            float ratio = (float) windowHandler.getWindowWidth()/(float) pixelMap.getImageInfo().size.width; 
 
            //获得裁剪后的位图 
            PixelMap cropped = CropOverlayView.getCroppedPixelMap(); 
            PixelMapHolder pixelMapHolder = new PixelMapHolder(cropped); 
 
            //创建bitmaputils工具类，获得位图相关数据 
            BitmapUtils bitmapUtils = new BitmapUtils(mContext, cropped, 400, msource); 
 
             
            Component.DrawTask drawTask = new Component.DrawTask() { 
                @Override 
                public void onDraw(Component component, Canvas canvas) { 
 
                    //获得行为动作 
                    int[] action = CropImageView.getActionResult(); 
                    //获得动作数目 
                    int actionIndex = CropImageView.getActionIndexResult(); 
                    //循环执行旋转、翻转动作 
                    for (int i = 0; i < actionIndex; i++) { 
                        if (action[i] == 1) { 
                            //rotate图像 
                            canvas.rotate(90, bitmapUtils.getRealPixelMapWidth() / 2 * ratio, bitmapUtils.getRealPixelMapHeight() / 2 * ratio); 
                        } else if (action[i] == 2) { 
                            //水平翻转 
                            //向下移动高度 
                            canvas.translate(bitmapUtils.getRealPixelMapWidth() * ratio, 0); 
                            //向y轴负方向缩放一倍 
                            canvas.scale(-1f, 1f); 
                        } else if (action[i] == 3) { 
                            //垂直翻转 
                            //向下移动高度 
                            canvas.translate(0, bitmapUtils.getRealPixelMapHeight() * ratio); 
                            //向y轴负方向缩放一倍 
                            canvas.scale(1f, -1f); 
                        } 
                    } 
 
                    //按照原来的比例进行缩放 
                    canvas.scale(ratio , ratio); 
                    //画图 
                    canvas.drawPixelMapHolder(pixelMapHolder, 200, 230, new Paint()); 
                } 
            }; 
 
            //为component增加drawtask方法 
            component.addDrawTask(drawTask); 
        } 
    } 
 
    public static PixelMap getCroppedPixelMap(){ 
        return CropOverlayView.getCroppedPixelMap(); 
    } 
 
    public static final class ActivityBuilder { 
 
        //设置图片的Uri 
        private final Uri mSource; 
 
        //需要跳转回的bundle的名字 
        private String bundleName; 
 
        //需要跳转回的Ability的名字 
        private String abilityName; 
 
        //request_code 
        private int request_code; 
 
        //初始化 记录一些信息 
        private ActivityBuilder(Uri source , String bundle , String ability , int request) { 
            mSource = source; 
            bundleName = bundle; 
            abilityName = ability; 
            request_code = request; 
        } 
 
        //返回一个intent 
        public Intent getIntent(Context context) { 
            return getIntent(context, CropImageActivity.class); 
        } 
 
        //返回一个intent 用来实现页面跳转 
        public Intent getIntent(Context context, Class cls) { 
            Intent intent = new Intent(); 
            intent.setParam("source", msource); 
            if(bundleName != null){ 
                intent.setParam("bundleName" , bundleName); 
            } 
            if(abilityName != null){ 
                intent.setParam("abilityName" , abilityName); 
            } 
            if(request_code != 0){ 
                intent.setParam("request_code" , request_code); 
            } 
            return intent; 
        } 
 
        //页面跳转 
        public void start(Ability ability, AbilitySlice abilitySlice) { 
            start(ability, abilitySlice, request_code); 
        } 
 
        //页面跳转 
        public void start(Ability ability, AbilitySlice abilitySlice, int requestCode) { 
            //给crop添加操作 
            AbilitySlice cropImageAbilitySlice = new CropImageActivity(); 
            abilitySlice.presentForResult(cropImageAbilitySlice, getIntent(ability), requestCode); 
        } 
 
        //设置资源图片，被裁减的图片的id 
        public ActivityBuilder setSource(int source) { 
            msource = source; 
            return this; 
        } 
 
        //设置context 
        public ActivityBuilder setContext(Context context) { 
            mContext = context; 
            return this; 
        } 
 
        //设置需要跳转回的bundle名字 
        public ActivityBuilder setBundleName(String s){ 
            bundleName = s; 
            return this; 
        } 
 
        //设置需要跳转回的ability名字 
        public ActivityBuilder setAbilityName(String s){ 
            abilityName = s; 
            return this; 
        } 
 
        //设置需要跳转回时的code 
        public ActivityBuilder setRequset_code(int i){ 
            request_code = i; 
            return this; 
        } 
 
    } 
 
 
} 
 
 
package com.example.javahm9.util; 
 
import ohos.aafwk.ability.AbilitySlice; 
import ohos.aafwk.content.Intent; 
import ohos.aafwk.content.Operation; 
import ohos.agp.colors.RgbColor; 
import ohos.agp.components.Button; 
import ohos.agp.components.Component; 
import ohos.agp.components.DependentLayout; 
import ohos.agp.components.element.ShapeElement; 
import ohos.agp.utils.RectFloat; 
import ohos.bundle.AbilityInfo; 
import ohos.media.image.PixelMap; 
 
import static ohos.agp.components.ComponentContainer.LayoutConfig.MATCH_PARENT; 
 
 
 
public class CropImageActivity extends AbilitySlice { 
 
    //定义此slice的Dependent布局 
    private DependentLayout myLayout = new DependentLayout(this); 
 
    //被裁减图片 
    private Component mPicture; 
 
    //被裁减图片的位图 
    private PixelMap mPixelMap; 
 
    //位图工具类 
    private BitmapUtils mBitmapUtils; 
 
    //屏幕工具类 
    private CropWindowHandler mCropWindowHandler; 
 
    //裁剪框 
    private Component mCropBound; 
 
    //裁剪框工具类 
    private CropOverlayView mCropOverlayView; 
 
    //图片资源 
    private int mSource; 
 
    //图片上边距 
    private final int topIndex = 400; 
 
    //图片工具类 
    private CropImageView mCropImageView; 
 
    //裁减结果的矩阵 
    public static RectFloat croppedRectFloat; 
 
    //裁减结果的pixelmap 
    public static PixelMap croppedPixelMap; 
 
    @Override 
    public void onStart(Intent intent) { 
        super.onStart(intent); 
 
        //创建本slice的布局文件 
        DependentLayout.LayoutConfig config = new DependentLayout.LayoutConfig(MATCH_PARENT, MATCH_PARENT); 
 
        //设置默认竖屏 
        setDisplayOrientation(AbilityInfo.DisplayOrientation.PORTRAIT); 
        //设置布局的背景 
        myLayout.setLayoutConfig(config); 
        ShapeElement element = new ShapeElement(); 
        element.setRgbColor(new RgbColor(255, 255, 255)); 
        myLayout.setBackground(element); 
 
        //设置button,image等 
        setupViews(intent); 
 
        //加载裁剪框、背景图片等等 
        loadInput(); 
 
        //加载布局 
        super.setUIContent(myLayout); 
    } 
 
    //按钮和图片初始化 
    private void setupViews(Intent intent) { 
        buttonInit(intent); 
        imageInit(intent); 
    } 
 
    //按钮初始化 
    private void buttonInit(Intent intent) { 
        //创建button 
        Button cancel = cancelButton(intent); 
        Button rotate = rotateButton(); 
//        Button horfilp = horizontalFilpButton(); 
//        Button verfilp =  verticalFilpButton(); 
 
        Button crop = cropButton(intent); 
 
        //将button添加到布局 
        myLayout.addComponent(cancel); 
        myLayout.addComponent(rotate); 
//        myLayout.addComponent(horfilp); 
//        myLayout.addComponent(verfilp); 
        myLayout.addComponent(crop); 
    } 
 
    //取消按钮 
    private Button cancelButton(Intent intent) { 
        //创建取消button 
        Button cancel = new Button(this); 
        //为button增加布局条件 
        DependentLayout.LayoutConfig cancelLayoutConfig = new DependentLayout.LayoutConfig(); 
        cancelLayoutConfig.setMargins(140, 50, 0, 0); 
        cancelLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_TOP); 
        cancelLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_PARENT_LEFT); 
        //设置背景颜色 
        cancel.setLayoutConfig(cancelLayoutConfig); 
        ShapeElement cancelElement = new ShapeElement(); 
        cancelElement.setRgbColor(new RgbColor(155, 155, 155)); 
        cancelElement.setCornerRadius(25); 
        cancel.setBackground(cancelElement); 
        //设置文本 
        cancel.setText("取消"); 
        cancel.setTextSize(55); 
        cancel.setHeight(180); 
        cancel.setWidth(220); 
        //绑定点击方法 
        cancel.setClickedListener(new Component.ClickedListener() { 
            public void onClick(Component v) { 
                //为按钮绑定方法 
                cancel(intent); 
            } 
        }); 
 
        return cancel; 
    } 
 
    //旋转按钮 
    private Button rotateButton() { 
        //创建旋转button 
        Button rotate = new Button(this); 
        //为button增加布局条件 
        DependentLayout.LayoutConfig rotateLayoutConfig = new DependentLayout.LayoutConfig(); 
        rotateLayoutConfig.setMargins(500, 50, 0, 0); 
        rotateLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_TOP); 
        rotateLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_PARENT_LEFT); 
        rotate.setLayoutConfig(rotateLayoutConfig); 
        //设置背景颜色 
        ShapeElement rotateElement = new ShapeElement(); 
        rotateElement.setRgbColor(new RgbColor(255, 228, 181)); 
        rotateElement.setCornerRadius(25); 
        rotate.setBackground(rotateElement); 
        //设置文本 
        rotate.setText("旋转"); 
        rotate.setTextSize(55); 
        rotate.setHeight(180); 
        rotate.setWidth(220); 
        //绑定点击方法 
        rotate.setClickedListener(new Component.ClickedListener() { 
            public void onClick(Component v) { 
                rotate(); 
            } 
        }); 
 
        return rotate; 
    } 
 
    //水平翻转按钮 
    private Button horizontalFilpButton() { 
        //创建翻转button 
        Button filp = new Button(this); 
        //为button增加布局条件 
        DependentLayout.LayoutConfig filpLayoutConfig = new DependentLayout.LayoutConfig(); 
        filpLayoutConfig.setMargins(0, 50, 300, 0); 
        filpLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_TOP); 
        filpLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_PARENT_RIGHT); 
        //设置背景颜色 
        filp.setLayoutConfig(filpLayoutConfig); 
        ShapeElement filpElement = new ShapeElement(); 
        filpElement.setRgbColor(new RgbColor(180, 238, 180)); 
        filpElement.setCornerRadius(25); 
        filp.setBackground(filpElement); 
        //设置文本 
        filp.setText("horFilp"); 
        filp.setTextSize(40); 
        filp.setHeight(85); 
        filp.setWidth(220); 
        //绑定点击方法 
        filp.setClickedListener(new Component.ClickedListener() { 
            public void onClick(Component v) { 
                horizontalFlip(); 
            } 
        }); 
 
        return filp; 
    } 
 
    //垂直翻转按钮 
    private Button verticalFilpButton() { 
        //创建翻转button 
        Button filp = new Button(this); 
        //为button增加布局条件 
        DependentLayout.LayoutConfig filpLayoutConfig = new DependentLayout.LayoutConfig(); 
        filpLayoutConfig.setMargins(0, 145, 300, 0); 
        filpLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_TOP); 
        filpLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_PARENT_RIGHT); 
        //设置背景颜色 
        filp.setLayoutConfig(filpLayoutConfig); 
        ShapeElement filpElement = new ShapeElement(); 
        filpElement.setRgbColor(new RgbColor(180, 238, 180)); 
        filpElement.setCornerRadius(25); 
        filp.setBackground(filpElement); 
        //设置文本 
        filp.setText("verFilp"); 
        filp.setTextSize(40); 
        filp.setHeight(85); 
        filp.setWidth(220); 
        //绑定点击方法 
        filp.setClickedListener(new Component.ClickedListener() { 
            public void onClick(Component v) { 
                verticalFlip(); 
            } 
        }); 
 
        return filp; 
    } 
 
    //裁剪按钮 
    private Button cropButton(Intent intent) { 
        //创建裁剪button 
        Button crop = new Button(this); 
        //为button增加布局条件 
        DependentLayout.LayoutConfig cropLayoutConfig = new DependentLayout.LayoutConfig(); 
        cropLayoutConfig.setMargins(820, 50, 0, 0); 
        cropLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_TOP); 
        cropLayoutConfig.addRule(DependentLayout.LayoutConfig.ALIGN_PARENT_LEFT); 
        //设置背景颜色 
        crop.setLayoutConfig(cropLayoutConfig); 
        ShapeElement cropElement = new ShapeElement(); 
        cropElement.setRgbColor(new RgbColor(0, 125, 155)); 
        cropElement.setCornerRadius(25); 
        crop.setBackground(cropElement); 
        //设置文本 
        crop.setText("裁剪"); 
        crop.setTextSize(55); 
        crop.setHeight(180); 
        crop.setWidth(220); 
        //绑定点击方法 
        crop.setClickedListener(new Component.ClickedListener() { 
            public void onClick(Component v) { 
                crop(intent); 
            } 
        }); 
 
        return crop; 
    } 
 
    //图片初始化 
    private void imageInit(Intent intent) { 
 
        //获得图片的id 
        int source = intent.getIntParam("source", 0); 
        mSource = source; 
 
        //根据图片id获取pixelmap 
        PixelMap pixelMapOriginal = BitmapUtils.getOriginalPixelMap(this, mSource).get(); 
        mPixelMap = pixelMapOriginal; 
 
        //创建bitmaputils工具类，获得位图相关数据 
        BitmapUtils bitmapUtils = new BitmapUtils(this , mPixelMap ,topIndex , mSource ); 
 
        //创建cropwindowhandler工具类，获得windows相关数据 
        CropWindowHandler cropWindowHandler = new CropWindowHandler(this); 
 
        //创建图片工具类，用来获得图片 
        mCropImageView = new CropImageView(mPixelMap , this ,  mSource , topIndex); 
 
        //获取展示图片的component 
        mPicture = mCropImageView.getmPicture(); 
 
        //计算图片的位置，使得图片居中显示，计算出图片距离屏幕左边的空白 
        int margin = cropWindowHandler.getWindowWidth()/2 - bitmapUtils.getPixelMapWidth()/2; 
 
        //给mPicture增加布局 
        DependentLayout.LayoutConfig componentLayoutConfig = new DependentLayout.LayoutConfig(); 
        componentLayoutConfig.setMargins(0, topIndex, 0, 0);//边距 
        mPicture.setLayoutConfig(componentLayoutConfig); 
 
        //将图片加入布局 
        myLayout.addComponent(mPicture); 
 
    } 
 
    //初始化工具类，加载裁剪框等等 
    private void loadInput() { 
 
        //创建位图工具类 
        mBitmapUtils = new BitmapUtils(this, mPixelMap, 400, mSource); 
 
        //创建屏幕工具类 
        mCropWindowHandler = new CropWindowHandler(this); 
 
        //创建裁剪框的工具类 
        mCropOverlayView = new CropOverlayView(this, mBitmapUtils, mCropWindowHandler); 
 
        //获得裁剪框 
        mCropBound = mCropOverlayView.getmCropBound(); 
 
        //将裁剪框加入布局文件 
        myLayout.addComponent(mCropBound); 
    } 
 
    //取消裁剪方法 
    private void cancel(Intent intentOriginal) { 
        Intent intent = new Intent(); 
 
        //增加裁剪状态及结果 
        intent.setParam("cropFlag", !CropImage.CROPFLAG); 
        intent.setParam("cropStatus", 1); 
 
        // 通过Intent中的OperationBuilder类构造operation对象，指定设备标识（空串表示当前设备）、应用包名、Ability名称 
        Operation operation = new Intent.OperationBuilder() 
                .withDeviceId("") 
                .withBundleName(intentOriginal.getStringParam("bundleName")) 
                .withAbilityName(intentOriginal.getStringParam("abilityName")) 
                .build(); 
        // 把operation设置到intent中 
        intent.setOperation(operation); 
 
        //跳转 
        startAbility(intent); 
    } 
 
    //图片旋转的方法 
    private void rotate(){ 
        //图片旋转 
        mCropImageView.rotateOnce(); 
        //裁剪框旋转 
        mCropOverlayView.rotateOnce(); 
    } 
 
    //图片水平翻转的方法 
    private void horizontalFlip(){ 
        //图片翻转 
        mCropImageView.horizontalFilp(); 
        //裁剪框翻转 
        mCropOverlayView.horizontalFilpOnce(); 
    } 
 
    //图片垂直翻转的方法 
    private void verticalFlip(){ 
        mCropImageView.verticalFilp(); 
        //裁剪框翻转 
        mCropOverlayView.verticalFilpOnce(); 
    } 
 
    //成功裁剪方法 
    private void crop(Intent intentOriginal) { 
 
        //计算裁减后的pixelmap并存放于cropoverlayview中 
        mCropOverlayView.croppedPixel(this); 
 
        //显示到MainActivity 
        Intent intent = new Intent(); 
 
        //增加裁剪状态及结果 
        intent.setParam("cropFlag", CropImage.CROPFLAG); 
        intent.setParam("cropStatus", 2); 
        intent.setParam("result_code" , 203); 
 
        RectFloat cropRect = mCropOverlayView.getmCropRect(); 
        //塞入裁剪结果 
        intent.setParam("resultImg", mSource); 
        croppedRectFloat = mCropOverlayView.getmCropRect(); 
        croppedPixelMap = mPixelMap; 
 
        // 通过Intent中的OperationBuilder类构造operation对象，指定设备标识（空串表示当前设备）、应用包名、Ability名称 
        Operation operation = new Intent.OperationBuilder() 
                .withDeviceId("") 
                .withBundleName(intentOriginal.getStringParam("bundleName")) 
                .withAbilityName(intentOriginal.getStringParam("abilityName")) 
                .build(); 
        // 把operation设置到intent中 
        intent.setOperation(operation); 
 
        //跳转 
        startAbility(intent); 
 
    } 
 
    @Override 
    protected void onStop() { 
        super.onStop(); 
    } 
} 

想了解更多内容，请访问：

51CTO和华为官方合作共建的鸿蒙技术社区

https://harmonyos.51cto.com