Android拷贝图片到指定文件路径

1.拷贝图片的工具类
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.text.TextUtils;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
* Created by Administrator .
*/
public class BitmapUtil {
private static final String DEAFAULT_FILE_PATH = getSdCardPath() + File.separator;

private BitmapUtil() {
}

    /**
     * 以最省内存的方式读取本地资源的图片
     *
     * @param context
     * @param resId
     * @return
     */
    public static Bitmap readBitMap(Context context, int resId) {
        BitmapFactory.Options opt = new BitmapFactory.Options();
        opt.inPreferredConfig = Bitmap.Config.RGB_565;
        opt.inPurgeable = true;
        opt.inInputShareable = true;
        // 获取资源图片
        InputStream is = context.getResources().openRawResource(resId);
        return BitmapFactory.decodeStream(is, null, opt);
    }

        Bitmap bmp = BitmapUtil.getDiskBitmap(path);
        if(bmp != null) {
            mHeaderIv.setImageBitmap(bmp);
        }
    /**
     * 读取本地图片
     * @param path 图片路径
     * */
    public static Bitmap getDiskBitmap(String path) {
        Bitmap bitmap = null;
        if(TextUtils.isEmpty(path)) {
            return bitmap;
        }
        try {
            File file = new File(path);
            if (file.exists()) {
                BitmapFactory.Options opt = new BitmapFactory.Options();
                opt.inPreferredConfig = Bitmap.Config.RGB_565;
                opt.inPurgeable = true;
                opt.inInputShareable = true;
                bitmap = BitmapFactory.decodeFile(path, opt);
             }
        } catch (Exception e) {
        }

return bitmap;
}

    /**
     * 保存图片到本地第一个参数是图片名称第二个参数为需要保存的bitmap
     * */
    public static void saveImgToDisk(String imgName, Bitmap bitmap) {
        File file = new File(DEAFAULT_FILE_PATH, imgName);
        if(file == null) {
            return;
        }

        if(isFileExists(file.getPath())) {
            return;
        }

        try {
            FileOutputStream out = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
            String path = file.getPath();
            out.flush();
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 判断文件路径是否已经存在
     * @param filePath 文件路径
     * */
    private static boolean isFileExists(String filePath) {
        try {
            File file = new File( filePath );
            return file.exists();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;

}

    /**
     * 返回SD卡跟目录

     *
     * @return SD卡跟目录
     */
    public static String getSdCardPath() {
        File sdDir ;
        boolean sdCardExist = isSdCardExist(); // 判断sd卡是否存在
        if (sdCardExist) {
            sdDir = Environment.getExternalStorageDirectory();// 获取跟目录
            return sdDir.toString();
        } else {
            return null;
        }
    }

    /**
     * 判断SD卡是否存在

     *
     * @return SD卡存在返回true，否则返回false
     */
    public static boolean isSdCardExist() {
        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
    }
}

2.读取本地图片
Bitmap bmp = BitmapUtil.getDiskBitmap(path);
if(bmp != null) {
mHeaderIv.setImageBitmap(bmp);
}

3.保存图片到本地
Bitmap bmp = BitmapFactory.decodeFile(localPath);
saveImgToDisk(fileName, bmp);

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