JAVA高级面试进阶训练营视频教程

admin

import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;


public class PictureUtils {

    private static String TAG = PictureUtils.class.getSimpleName();

    private static int CODE_WIDTH = 60;
    private static int CODE_HEIGHT = 60;

    private PictureUtils() {

    }

    /**
     * 保存一张或者多张图片到图库
     */
    public static void saveImageListToGallery(final BaseActivity context,
            final List<String> imgList, final OnSaveImgCallBack callBack) {

        if (context == null) {
            LogUtils.dTag(TAG, "context 不能为null");
            return;
        }

        RxPermissionsUtils.getInstance()
                .requestPermission(context, RxPermissionsUtils.READ_AND_WRITE_PERMISSION,
                        new RxPermissionsUtils.OnPermissionRequestCallBack() {
                            @Override
                            public void onSuccess() {
                                if (imgList == null) {
                                    LogUtils.dTag(TAG, "图片数组为 null");
                                    return;
                                }

                                // 保存图片到图库
                                saveImageListToGalleryPrivate(context, imgList, callBack);

                            }

                            @Override
                            public void onFail() {
                                ToastUtils.showShort("请在设置授予应用存储权限^_^");
                                PermissionUtils.launchAppDetailsSettings();
                            }
                        });

    }

    /**
     * 保存多张图片
     */
    private static void saveImageListToGalleryPrivate(BaseActivity context, List<String> imgList,
            final OnSaveImgCallBack callBack) {

        Observable.just(imgList)
                .observeOn(Schedulers.io())
                .flatMap(new Function<List<String>, ObservableSource<Boolean>>() {
                    @Override
                    public ObservableSource<Boolean> apply(List<String> strings) throws Exception {

                        for (String filePath : strings) {

                            if (filePath.startsWith("http://") || filePath.startsWith("https://")) {

                                Bitmap bmp = Glide.with(BaseApplication.getInstance())
                                        .asBitmap()
                                        .load(filePath)
                                        .submit()
                                        .get();

                                saveImageToGallery(BaseApplication.getInstance(), bmp, filePath);

                            } else {

                                Bitmap bmp = BitmapFactory.decodeFile(filePath);

                                saveImageToGallery(BaseApplication.getInstance(), bmp, filePath);
                            }

                        }

                        return Observable.just(true);
                    }
                })
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<Boolean>() {
                    Disposable mD;

                    @Override
                    public void onSubscribe(Disposable d) {
                        mD = d;
                        if (callBack != null) {
                            callBack.onSaveStart();
                        }
                    }

                    @Override
                    public void onNext(Boolean aBoolean) {
                        ToastUtils.showShort("图片已成功保存到系统相册^_^");
                        if (callBack != null) {
                            callBack.onSaveSuccess();
                        }
                    }

                    @Override
                    public void onError(Throwable e) {
                        if (mD != null) {
                            mD.dispose();
                        }
                        if (callBack != null) {
                            callBack.onSaveFail();
                        }
                    }

                    @Override
                    public void onComplete() {
                        if (mD != null) {
                            mD.dispose();
                        }
                    }
                });


    }

    /**
     * 保存 Bitmap 到相册 获得路径
     */
    public static String saveImageToGallery(Context context, Bitmap bmp, String imageUrl) {

        if (!SDCardUtils.isSDCardEnableByEnvironment()) {
            LogUtils.dTag(TAG, "内存卡不可用");
            return null;
        }

        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath(),
                NetWorkConstants.FileKey.COMMONLIB_SHARE_CODE_DIR_NAME);// 获取文件存储路径

        if (!appDir.exists()) {
            boolean isCreate = appDir.mkdir();
            if (!isCreate) {
                return null;
            }
        }

        // 创建文件 截取,取出名字
        String url_truncated = String.valueOf(System.currentTimeMillis());
        String fileName = "mryt_share_code" + "_" + url_truncated;
        File file = new File(appDir, fileName);
        FileUtils.deleteFile(file);
        if (FileUtils.isFileExists(file)) {
            LogUtils.dTag(TAG, file.getAbsolutePath());
            return file.getAbsolutePath();
        }
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
            // 插入图库
            /**MediaStore.Images.Media
                    .insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName,
                            String.valueOf(System.currentTimeMillis()));*/
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新

        /**MediaScannerConnection.scanFile(context, new String[]{file.getAbsolutePath()}, null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    @Override
                    public void onScanCompleted(String path, Uri uri) {

                    }
                });*/
        try {
            savePhotoToMedia(context, file, fileName);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return file.getAbsolutePath();
    }

    /**
     * 保存 Bitmap 到相册 获得路径 不传递文件名称 用时间后缀
     */
    public static String saveImageToGallery(Context context, Bitmap bmp) {
        // 首先保存图片
        File appDir = context.getExternalFilesDir(
                NetWorkConstants.FileKey.COMMONLIB_SHARE_CODE_DIR_NAME);// 获取文件存储路径
        if (appDir != null && !appDir.exists()) {
            boolean isCreate = appDir.mkdir();
            if (!isCreate) {
                return null;
            }
        }
        if (!SDCardUtils.isSDCardEnableByEnvironment()) {
            LogUtils.dTag(TAG, "内存卡不可用");
            return null;
        }

        // 创建文件 截取,取出名字
        String url_truncated = String.valueOf(System.currentTimeMillis());
        String fileName = "mryt_share_code" + "_" + url_truncated;
        File file = new File(appDir, fileName);
        if (FileUtils.isFileExists(file)) {
            LogUtils.dTag(TAG, file.getAbsolutePath());
            return file.getAbsolutePath();
        }
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
            // 插入图库
            /**MediaStore.Images.Media
             .insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName,
             String.valueOf(System.currentTimeMillis()));*/
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新
//        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file)));
        /**MediaScannerConnection.scanFile(context, new String[]{file.getAbsolutePath()}, null,
         new MediaScannerConnection.OnScanCompletedListener() {
        @Override public void onScanCompleted(String path, Uri uri) {
        }
        });*/

        try {
            savePhotoToMedia(context, file, fileName);
            ToastUtils.showShort("图片已成功保存到相册");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            ToastUtils.showShort("图片保存失败");
        }
        return file.getAbsolutePath();
    }

    public static Bitmap getBitmapFromView(Context context, View view) {
        view.setDrawingCacheEnabled(true);
        //启用DrawingCache并创建位图
        view.buildDrawingCache();
        //创建一个DrawingCache的拷贝，因为DrawingCache得到的位图在禁用后会被回收
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
        //禁用DrawingCahce否则会影响性能
        view.setDrawingCacheEnabled(false);
        return bitmap;
    }

    //图片上绘制文字
    public static Bitmap drawTextToBitmap(Bitmap bitmap, String text,
            Paint paint, Rect bounds, int paddingLeft, int paddingTop) {
        android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();

        paint.setDither(true); // 获取跟清晰的图像采样
        paint.setFilterBitmap(true);// 过滤一些
        if (bitmapConfig == null) {
            bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
        }
        bitmap = bitmap.copy(bitmapConfig, true);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawText(text, paddingLeft, paddingTop, paint);
        return bitmap;
    }


    public static Bitmap setImgSize(Bitmap bm, int newWidth, int newHeight) {
        // 获得图片的宽高.
        int width = bm.getWidth();
        int height = bm.getHeight();
        // 计算缩放比例.
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // 取得想要缩放的matrix参数.
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        // 得到新的图片.
        return Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);
    }

    // 保存图片的回调
    public interface OnSaveImgCallBack {

        void onSaveStart();

        void onSaveSuccess();

        void onSaveFail();
    }

    public static void savePhotoToMedia(Context context, File file, String fileName)
            throws FileNotFoundException {
        String uriString = MediaStore.Images.Media
                .insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName, null);
//        String uriString = MediaStore.Images.Media.insertImage(context.getContentResolver(), bitmap, null, null);
        File file1 = new File(getRealPathFromURI(Uri.parse(uriString), context));
        updatePhotoMedia(file1, context);
    }

    //更新图库
    private static void updatePhotoMedia(File file, Context context) {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        intent.setData(Uri.fromFile(file));
        context.sendBroadcast(intent);
    }

    //得到绝对地址
    private static String getRealPathFromURI(Uri contentUri, Context context) {
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        if (cursor == null) {
            return "";
        }
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        String fileStr = cursor.getString(column_index);
        cursor.close();
        return fileStr;
    }
}