Question

我是一名新手开发人员，我目前正在开发一款应用程序，其中部分功能允许用户捕获图像，将其存储在应用程序的文件系统中，并将其引用存储在SQLite数据库的列中。然后，用户将能够根据与数据库中的关联条件在网格视图中查看这些图像（例如，仅显示特定颜色的图像）。

首先，我实际上“抓住”了捕获图像的文件名，并使用以下代码将其存储在数据库中：

//Initializing Variables:
protected ImageButton _button;
protected ImageView _image;
protected TextView _field;
protected String _path;
protected String name;
protected boolean _taken;
protected static final String PHOTO_TAKEN = "photo_taken";

@Override
protected void onCreate(Bundle savedInstanceState) {
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.newitemui);

    //Creating the "item_images" directory and File:
    File dir = new File("sdcard/item_images"); 
    try
    {
        //Create new directory:
        if(dir.mkdir()) 
        {
            System.out.println("Directory created");
        } 
        else 
        {
            System.out.println("Directory is not created");
        }
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }

    //Setting the current time stamp for image name:
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date());

    _image = ( ImageView ) findViewById( R.id.image );
    _field = ( TextView ) findViewById( R.id.field );
    _button = ( ImageButton ) findViewById( R.id.button );
    _button.setOnClickListener( new ButtonClickHandler() );
    name = "IMG_" + timeStamp + ".png";
    _path = Environment.getExternalStorageDirectory() + File.separator + "/item_images" + "/" + name;

    Toast toast = Toast.makeText(NewItemUI.this,"Touch Camera to Capture Image", Toast.LENGTH_LONG);
    toast.show();
    toast.setGravity(Gravity.DISPLAY_CLIP_HORIZONTAL|Gravity.BOTTOM, 0, 200);
}

 public class ButtonClickHandler implements View.OnClickListener 
    {
        public void onClick( View view ){
            startCameraActivity();
        }
    }

 protected void startCameraActivity()
    {
        File file = new File( _path );
        Uri outputFileUri = Uri.fromFile( file );

        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
        intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

        startActivityForResult( intent, 0 ); 
    }


 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    {               
        switch( resultCode )
        {
            //If user did not take photo, return to the original screen with no result:
            case 0:
                break;

            //If user took a photo, insert the image name into database and return to the original screen with the captured image displayed:
            case -1:

                    AppDatabase appdb = new AppDatabase(this);
                    SQLiteDatabase sql = appdb.getWritableDatabase();
                    sql.execSQL("INSERT INTO tblClothingItem (imagePath) VALUES ('"+name+"');");
                    sql.close();
                    appdb.close();

                    onPhotoTaken();
                    break;  
        }

    }

但是我意识到存储的文件名只是应用程序上下文中的普通字符串，实际上并不指向存储在文件系统中的任何一个图像。

我想知道的是：

如何在我的SQLite数据库中存储图像的Uri 被抓获

我将如何根据存储的图像检索图像 Uri要在gridview中显示。

欢迎任何建议，示例代码和反馈。

Answer 1

在我的应用程序中，我想在SQLite数据库中存储用户的个人资料图片所以我添加了一个用于存储图像路径的字符串列，图像将从图库中选择

//Executed When user Click on image for selecting profile from Gallery

ImageView profileperson = (ImageView) findViewById(R.id.profileperson);
    profileperson.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(
                    Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(i, 1);
        }
    });

String path;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1 && resultCode == RESULT_OK && null != data) {
        Uri selectedImage = data.getData();
        String[] fillPath = {MediaStore.Images.Media.DATA};
        Cursor cursor = getContentResolver().query(selectedImage, fillPath, null, null, null);
        assert cursor != null;
        cursor.moveToFirst();
        path = cursor.getString(cursor.getColumnIndex(fillPath[0]));
        cursor.close();
        profileperson.setImageBitmap(BitmapFactory.decodeFile(path));
    }
}

然后在显示中我使用Cursor

获取图像的路径

String employeeimage;
...
employeeimage = cursor.getString(cursor.getColumnIndex("employeeimage"));  //employeeimage is column name

现在我在RecyclerView中显示所有数据，所以我使用Adapter来绑定数据。

List<Data> list = Collections.emptyList();
...
    @Override
public void onBindViewHolder(final ViewHolder holder, final int position) {

    /*
    * get items from list of particular position and set into respective textview
    * */

    String path=list.get(position).employeeImage;

    Picasso.with(context).load(new File(path)).into(holder.imageViewPerson);
}

从sqlite存储和检索Uri

1 个答案: