我正在开发一款Android应用,其中部分功能是用户可以从他们的设备中选择图像,将其与列表中的特定项目相关联,并在应用中使用它。我的目的是将图像本身存储在内部存储器中,并在SQLite数据库中存储图像的路径,其中包含项目的其余存储信息。
我已经能够让用户选择并成像并上传它,但图像有时会根据图片的拍摄方式旋转。我试过看过Exif数据,但方向总是为零。我已经尝试将光标用于MediaStore.Images.Media.DATA
信息,但也无济于事。相关代码的当前状态如下:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);
mDbHelper = new EntryDbHelper(this);
Intent intent = getIntent();
pId = intent.getIntExtra(PhrasesActivity.T_KEY, -1);
mImageView = (ImageView) findViewById(R.id.details_img);
mImageView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
//Making an intent to Pick an image, looking for an Internal URI
Intent pickImageIntent = new Intent(Intent.ACTION_GET_CONTENT);
//Setting the content to images
pickImageIntent.setType("image/*");
if(pickImageIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(pickImageIntent, REQUEST_IMAGE_GET);
}
return true;
}
});
setText();
setImage();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_IMAGE_GET && resultCode == RESULT_OK) {
Bitmap image = null;
Uri imageUri = data.getData();
try {
image = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
} catch(FileNotFoundException e) {
e.printStackTrace();
} catch(IOException e) {
e.printStackTrace();
}
mImageView.setImageBitmap(image);
String path = storeImage(image);
SQLiteDatabase db = mDbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(PhraseEntry.COLUMN_URI, path.toString());
String selection = PhraseEntry._ID + " = ?";
String[] selectionArgs = {Integer.toString(pId)};
int count = db.update(PhraseEntry.TABLE_NAME, values, selection, selectionArgs);
if(count == 1) {
Toast.makeText(this, "Image Updated Successfully", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Image Updated UNSUCCESSFULLY", Toast.LENGTH_SHORT).show();
}
}
}
private void setImage() {
SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {
PhraseEntry.COLUMN_URI
};
String selection = PhraseEntry._ID + " = ?";
String[] selectionArgs = {Integer.toString(pId)};
Cursor cursor = db.query(PhraseEntry.TABLE_NAME, projection, selection, selectionArgs,
null, null, null);
String imagePath = "";
while(cursor.moveToNext()) {
imagePath = cursor.getString(
cursor.getColumnIndexOrThrow(PhraseEntry.COLUMN_URI)
);
}
if(!imagePath.isEmpty()) {
try {
File f = new File(imagePath, "phrase_" + Integer.toString(pId));
Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
mImageView.setImageBitmap(b);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
else {
mImageView.setImageResource(R.drawable.sample);
}
cursor.close();
}
以下是相关的布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.bladefrisch.discoveringtalk.DetailsActivity">
<ImageView
android:id="@+id/details_img"
style="@style/DetailImage"
android:contentDescription="Sample"
android:src="@drawable/sample" />
<TextView
android:id="@+id/details_text"
style="@style/DetailText"
tools:text="Hello, how are you?" />
</LinearLayout>
这允许用户选择图像,将其上传到图像视图(有时旋转),存储图像,并在关闭应用程序后检索图像。轮换是唯一的主要问题,我尝试的修复程序没有在这里反映出来。我在这里引用了太多的答案,但它们分为三大类:检查Exif标签并用矩阵旋转Bitmap,使用光标获取图像信息并旋转,并使用Glide。这三个都失败了,我不知道接下来要做什么。有什么建议吗?
完整的代码可以找到here。
更新
根据要求,我added Exif检查代码无济于事。如前所述,方向始终为零,因此我根据链接中的代码得到一个空位图。
答案 0 :(得分:0)
我不知道saveImage()
做了什么。假设它接收Bitmap
并返回&#34;路径&#34;,我认为它将Bitmap
保存到文件中。如果是这样,那肯定不会起作用,因为Bitmap
没有EXIF数据。
使用the support library's edition of ExifInterface
从原始内容中读取EXIF标记。使用getContentResolver().openInputStream(imageUri)
获取InputStream
,并将其传递给ExifInterface
构造函数。