Android 从相机捕获时图片/图像质量低
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Low picture/image quality when capture from camera
提问by ckng
I have one problem. When I try to get picture from camera, the quality is very low. At first, capture the picture using camera, than save to the directory and at the same time get that picture and show in my app.The picture saved inside directory is a fine quality but when I get it from directory, the quality is low. below is my sample code :
我有一个问题。当我尝试从相机获取图片时，质量非常低。首先，使用相机拍摄图片，然后保存到目录，同时获取该图片并显示在我的应用程序中。保存在目录中的图片质量很好，但是当我从目录中获取它时，质量很低。下面是我的示例代码：
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == CAMERA_PIC_REQUEST) {
Bitmap thumbnail = (Bitmap) intent.getExtras().get("data");
if (g==1)
{
ImageView myImage = (ImageView) findViewById(R.id.img5);
myImage.setImageBitmap(thumbnail);
View a = findViewById(R.id.img5);
a.setVisibility(View.VISIBLE);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byteArray1 = stream.toByteArray();
}
}
any solution/suggestion? Thanks :)
任何解决方案/建议？谢谢 ：）
Solved
解决了
The problem solved when I follow the code given by Antrrometbelow
当我按照下面Antrromet给出的代码解决问题时
回答by Antrromet
I have used the following code and this works perfectly fine for me.
我使用了以下代码，这对我来说非常好。
values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "New Picture");
values.put(MediaStore.Images.Media.DESCRIPTION, "From your Camera");
imageUri = getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, PICTURE_RESULT);
and also
并且
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case PICTURE_RESULT:
if (requestCode == PICTURE_RESULT)
if (resultCode == Activity.RESULT_OK) {
try {
thumbnail = MediaStore.Images.Media.getBitmap(
getContentResolver(), imageUri);
imgView.setImageBitmap(thumbnail);
imageurl = getRealPathFromURI(imageUri);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
and
和
public String getRealPathFromURI(Uri contentUri) {
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
回答by Cristofer
I will give you something that work for me. I asked the same !
我会给你一些对我有用的东西。我也是这样问的！
Solution to save a picture in a specific folder without lost quality
I FOUND THE SOLUTION:
我找到了解决方案：
//Create a new folder code:
//创建一个新的文件夹代码：
String path = String.valueOf(Environment.getExternalStorageDirectory()) + "/your_name_folder";
try {
File ruta_sd = new File(path);
File folder = new File(ruta_sd.getAbsolutePath(), nameFol);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
if (success) {
Toast.makeText(MainActivity.this, "Carpeta Creada...", Toast.LENGTH_SHORT).show();
}
} catch (Exception ex) {
Log.e("Carpetas", "Error al crear Carpeta a tarjeta SD");
}
Intent i = new Intent(MainActivity.this, MainActivity.class);
startActivity(i);
finish();//agregue este
//Method to take a Picture
//拍照方法
public void clickFoto(View view) {
takePic();
}
//takePic()
//拍照（）
private void takePic() {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
*File file = new File(Environment.getExternalStorageDirectory(), "/your_name_folder/a" + "/photo_" + timeStamp + ".png");*
imageUri = Uri.fromFile(file);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, PICTURE_RESULT);
}
//onActivityResult
// onActivityResult
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case PICTURE_RESULT:
if (requestCode == PICTURE_RESULT)
if (resultCode == Activity.RESULT_OK) {
try {
Bitmap thumbnail = MediaStore.Images.Media.getBitmap(
getContentResolver(), imageUri);
imgFoto.setImageBitmap(thumbnail);
imageurl = getRealPathFromURI(imageUri);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
// getRealPathFromUri
// getRealPathFromUri
public String getRealPathFromURI(Uri contentUri) {
String[] proj = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
回答by behroz arshiya
Add the photo to a gallery. .
将照片添加到画廊。.
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(currentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
}
for more detail : https://developer.android.com/training/camera/photobasics.html
更多详情：https: //developer.android.com/training/camera/photobasics.html
