Android：读取本地相册与相机获取图片上传到服务器（用字符串的形式上传）

private Uri imageUri;

//打开照相机private void openCamera() { Intent openCameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "image.jpg")); //指定照片保存路径（SD卡），image.jpg为一个临时文件，每次拍照后这个图片都会被替换 openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); startActivityForResult(openCameraIntent, CAMERA_REQUEST_CODE);}

//打开图库
private void openPhones() {
// 图库选择
// 激活系统图库，选择一张图片
Intent intent_gallery = new Intent(Intent.ACTION_PICK);
intent_gallery.setType("image/*");
startActivityForResult(intent_gallery, IMAGE_REQUEST_CODE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);
if (requestCode == IMAGE_REQUEST_CODE) {//相册
imageUri= data.getData();
//获取照片路径
String[] filePathColumn = {MediaStore.Audio.Media.DATA};
Cursor cursor = getContentResolver().query(imageUri, filePathColumn, null, null, null);
cursor.moveToFirst();
photoPath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
cursor.close();
crop(imageUri);

} else if (requestCode == CAMERA_REQUEST_CODE) {//相机
photoPath = Environment.getExternalStorageDirectory() + "/image.jpg";
crop(imageUri);
} else if (requestCode == RESULT_REQUEST_CODE) {
setImageBitmap();
img_touxiang.setImageBitmap(bitmap);
bitmapToString = bitmapToString(bitmap);
//请求服务器的接口，上传到服务器
}
}

 

/**
* 剪切图片
*/
private void crop(Uri uri) {
// 裁剪图片意图
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
// 裁剪框的比例，1：1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// 裁剪后输出图片的尺寸大小
intent.putExtra("outputX", 250);
intent.putExtra("outputY", 250);
// 图片格式
intent.putExtra("outputFormat", "PNG");
intent.putExtra("noFaceDetection", true);// 取消人脸识别
intent.putExtra("return-data", true);// true:不返回uri，false：返回uri
startActivityForResult(intent, RESULT_REQUEST_CODE);//同样的在onActivityResult中处理剪裁好的图片
}

/**
* 压缩图片
*/
private void setImageBitmap() {
//获取imageview的宽和高
int targetWidth = img_touxiang.getWidth();
int targetHeight = img_touxiang.getHeight();

//根据图片路径，获取bitmap的宽和高
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(photoPath, options);
int photoWidth = options.outWidth;
int photoHeight = options.outHeight;

//获取缩放比例
int inSampleSize = 1;
if (photoWidth > targetWidth || photoHeight > targetHeight) {
int widthRatio = Math.round((float) photoWidth / targetWidth);
int heightRatio = Math.round((float) photoHeight / targetHeight);
inSampleSize = Math.min(widthRatio, heightRatio);
}

//使用现在的options获取Bitmap
options.inSampleSize = inSampleSize;
options.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(photoPath, options);
img_touxiang.setImageBitmap(bitmap);
}

//把bitmap转换成字符串
public static String bitmapToString(Bitmap bitmap) {
String string = null;
ByteArrayOutputStream btString = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, btString);
byte[] bytes = btString.toByteArray();
string = Base64.encodeToString(bytes, Base64.DEFAULT);
return string;
}