如何从图库中存储图像到SQLite数据库

7jmck4yq 于 2023-04-21 发布在 SQLite

关注(0)|答案(3)|浏览(231)

我已经尝试了这个代码上传图像从画廊到sqllite数据库在我的应用程序，但当我的应用程序试图打开画廊，它给了部队关闭错误，我不知道什么是problem.help我和thanx在先进的

public class ImagggggggActivity extends Activity { 

    private static final int SELECT_PICTURE = 1;
    private String selectedImagePath; 
    private ImageView img; 

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.main);  

         ((Button) findViewById(R.id.button1)) 
         .setOnClickListener(new OnClickListener() { 

             public void onClick(View arg0) { 

                 // in onCreate or any event where your want the user to 
                 // select a file 
                 Intent intent = new Intent(); 
                 intent.setType("image/*"); 
                 intent.setAction(Intent.ACTION_GET_CONTENT); 
                 startActivityForResult(Intent.createChooser(intent, 
                         "Select Picture"), SELECT_PICTURE); 
             } 
         }); 
} 

public void onActivityResult(int requestCode, int resultCode, Intent data) { 
 if (resultCode == RESULT_OK) { 
     if (requestCode == SELECT_PICTURE) { 
         Uri selectedImageUri = data.getData(); 
         selectedImagePath = getPath(selectedImageUri); 
     } 
 } 
} 

public String getPath(Uri uri) { 
 String[] projection = { MediaStore.Images.Media.DATA }; 
 Cursor cursor = managedQuery(uri, projection, null, null, null); 
 int column_index = cursor 
         .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
 cursor.moveToFirst(); 
 return cursor.getString(column_index); 
}}

sqlite

来源：https://stackoverflow.com/questions/10977584/how-to-store-image-in-sqlite-database-from-gallery

3条答案

按热度按时间

inb24sb21#

点击按钮导入表单设备

Intent sdintent = new Intent(Intent.ACTION_PICK);
sdintent.setType("image/*");
startActivityForResult(sdintent, SD_REQUEST);

从sd卡获取图像

if (requestCode == SD_REQUEST) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
cursor.moveToFirst();

int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
cursor.close();

Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);
        
testimage.setImageBitmap(yourSelectedImage);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
yourSelectedImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
byteArray = stream.toByteArray();
}

保存图像

DatabaseAdapter dbHelper = new DatabaseAdapter(Profiles.this);
   
       dbHelper.open();
       dbHelper.createUserProfiles( byteArray);
       dbHelper.close();

现在在DatabaseAdapter.java
定义

public static final String U_PIC = "picture";

然后

private long createUserTableContentValues(long id,byte[] byteImage) {
        ContentValues values = new ContentValues();
        values.put(ID, id);
        values.put(U_PIC, byteImage);
return database.insert(IMAGE_INSERT, null, values);
}

我想这可能对你有帮助……
其他资源：http://www.helloandroid.com/tutorials/store-imagesfiles-database
http://www.coderanch.com/t/507054/Android/Mobile/Storing-image-database
https://web.archive.org/web/20200718180158/http://www.tutorialforandroid.com/2009/10/how-to-insert-image-data-to-sqlite.html

赞(0）回复(0）举报 2023-04-21

bttbmeg02#

使用BLOB数据类型，我们可以将图像存储在SQLite数据库中。实际存储在数据库中的数据是组成图像或文件的字节。
至于从画廊获得图片，看here，似乎，你已经忘记了“超级”的电话。

赞(0）回复(0）举报 2023-04-21

e4eetjau3#

db.execSQL("CREATE TABLE images (" 
    + "_id INTEGER PRIMARY KEY AUTOINCREMENT," 
    + "data BLOB," 
    + "hash BLOB UNIQUE" 
    + ");");

要将图像转换为BLOB，请使用以下代码：（注意，我们在这里压缩图像）

private byte[] getBitmapAsByteArray(Bitmap bitmap)
 { 
   ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); 
   // Middle parameter is quality, but since PNG is lossless, it doesn't matter 
   bitmap.compress(CompressFormat.PNG, 0, outputStream); 
   return outputStream.toByteArray(); 
}

赞(0）回复(0）举报 2023-04-21

我来回答

如何从图库中存储图像到SQLite数据库

3条答案

相关问题

热门标签

最新问答