android 保存图片到本地系统相册

工具类：

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  dearxy是可以改的        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;    }}

activity 中代码：

public class MainActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks {    private static final int REQUEST_CODE_SAVE_IMG = 10;    private static final String TAG = "MainActivity";    private Context mContext;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mContext = this;        findViewById(R.id.save_img_btn).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                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(mContext, 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() {        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.fj);        boolean isSaveSuccess = ImgUtils.saveImageToGallery(mContext, bitmap);        if (isSaveSuccess) {            Toast.makeText(mContext, "保存图片成功", Toast.LENGTH_SHORT).show();        } else {            Toast.makeText(mContext, "保存图片失败，请稍后重试", Toast.LENGTH_SHORT).show();        }    }    //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 list) {        Log.i(TAG, "onPermissionsGranted:" + requestCode + ":" + list.size());        saveImage();    }    //拒绝授权    @Override    public void onPermissionsDenied(int requestCode, List perms) {        Log.i(TAG, "onPermissionsDenied:" + requestCode + ":" + perms.size());        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            Log.i(TAG, "onPermissionsDenied:------>自定义设置授权后返回APP");            saveImage();        }    }}

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