Android 保存图片到本地

现在项目中基本都有这样的需求，把图片保存到本地相册

这是一个工具类代码如下：

public class ImgUtils {
    /**
     * 保存文件到指定路径
     */
    public static boolean saveImageToGallery(Context context, Bitmap bmp){
        // 首先保存图片
        String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "dearxy";
        File appDir = new File(storePath);
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            //通过io流的方式来压缩保存图片
            boolean isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 60, fos);
            fos.flush();
            fos.close();

            //把文件插入到系统图库
            //MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName, null);

            //保存图片后发送广播通知更新数据库
            Uri uri = Uri.fromFile(file);
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
            if (isSuccess) {
                return true;
            } else {
                return false;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }
}

Android 6.0的手机需要先申请权限，拿到权限后再保存，否则会失败
添加依赖

compile ‘pub.devrel:easypermissions:0.3.0’

实现EasyPermissions.PermissionCallbacks，重写获取权限的方法

    @OnClick(R.id.save)
    public void save() {
        requestPermission();
    }

    /**
     * 请求读取sd卡的权限
     */
    private void requestPermission() {
        if (Build.VERSION.SDK_INT >= 23) {
            //读取sd卡的权限
            String[] mPermissionList = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};
            if (EasyPermissions.hasPermissions(getApplicationContext(), mPermissionList)) {
                //已经同意过
                saveImage();
            } else {
                //未同意过,或者说是拒绝了，再次申请权限
                EasyPermissions.requestPermissions(
                        this,  //上下文
                        "保存图片需要读取sd卡的权限", //提示文言
                        REQUEST_CODE_SAVE_IMG, //请求码
                        mPermissionList //权限列表
                );
            }
        } else {
            saveImage();
        }
    }


    /**
     * 保存图片
     */
    private void saveImage() {
        System.out.println(" 6666 ");
        System.out.println(current + " current ");
        final String urls = imagesUrl.get(current);
        System.out.println(urls + " url ");
        System.out.println(" 8888 ");

//        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.fj);

        new Thread(new Runnable() {
            Bitmap bitmap = null;
            @Override
            public void run() {
                URL url = null;
                try {
                    url = new URL("http://test.zuihou99.com" + urls);
                    InputStream is = null;
                    BufferedInputStream bis = null;
                    try {
                        is = url.openConnection().getInputStream();
                        bis = new BufferedInputStream(is);
                        bitmap = BitmapFactory.decodeStream(bis);

                        boolean isSaveSuccess = ImgUtils.saveImageToGallery(getApplicationContext(), bitmap);
                        if (isSaveSuccess) {
                            Looper.prepare();
                            Toast.makeText(getApplicationContext(), "保存图片成功", Toast.LENGTH_SHORT).show();
                            Looper.loop();
                        } else {
                            Looper.prepare();
                            Toast.makeText(getApplicationContext(), "保存图片失败，请稍后重试", Toast.LENGTH_SHORT).show();
                            Looper.loop();
                        }

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }


    /**
     * 根据图片的url路径获得Bitmap对象
     *
     * @param url
     * @return
     */
    private Bitmap decodeUriAsBitmapFromNet(String url) {
        URL fileUrl = null;
        Bitmap bitmap = null;

        try {
            fileUrl = new URL(url);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        try {
            HttpURLConnection conn = (HttpURLConnection) fileUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
    }


    //授权结果，分发下去
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        // Forward results to EasyPermissions
        //跳转到onPermissionsGranted或者onPermissionsDenied去回调授权结果
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }


    //同意授权
    @Override
    public void onPermissionsGranted(int requestCode, List<String> list) {
        saveImage();
    }

    //拒绝授权
    @Override
    public void onPermissionsDenied(int requestCode, List<String> perms) {
        if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
            //打开系统设置，手动授权
            new AppSettingsDialog.Builder(this).build().show();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == AppSettingsDialog.DEFAULT_SETTINGS_REQ_CODE) {
            //拒绝授权后，从系统设置了授权后，返回APP进行相应的操作
            saveImage();
        }
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // TODO: add setContentView(...) invocation
        ButterKnife.bind(this);
    }

这样就可以了，有不对的欢迎指出

这里附上源码http://download.youkuaiyun.com/download/qq_23668969/10042303