private void openTakePhoto(){
  /**
  * 在启动拍照之前最好先判断一下sdcard是否可用
  */
  String state = Environment.getExternalStorageState(); //拿到sdcard是否可用的状态码
  if (state.equals(Environment.MEDIA_MOUNTED)){   //如果可用
   Intent intent = newIntent("android.media.action.IMAGE_CAPTURE");
   startActivityForResult(intent,TAKE_PHOTO);
  }else {
   Toast.makeText(SettingActivity.this,"sdcard不可用",Toast.LENGTH_SHORT).show();
  }
 }

@Override
 protected void onActivityResult(int requestCode, int resultCode, Intentdata) {
  super.onActivityResult(requestCode, resultCode, data);
  if (data!= null) {
   switch (requestCode) {
    case TAKE_PHOTO: //拍摄图片并选择
     //两种方式 获取拍好的图片
     if (data.getData() != null|| data.getExtras() != null){ //防止没有返回结果
      Uri uri =data.getData();
      if (uri != null) {
       photo =BitmapFactory.decodeFile(uri.getPath()); //拿到图片
      }
      if (photo == null) {
       Bundle bundle =data.getExtras();
       if (bundle != null){
        photo =(Bitmap) bundle.get("data");
       } else {
        Toast.makeText(getApplicationContext(), "找不到图片",Toast.LENGTH_SHORT).show();
       }
      }
      //处理图片
      //裁剪图片
     }
     break;