Question

我想在手机图库的图像视图中加载图像，我有写了代码的java：

public class MainActivity extends AppCompatActivity {

private static int RESULT_LOAD_IMAGE = 1;
Button btnTry , btnAdd;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnAdd = findViewById(R.id.btnAdd);
    btnTry = findViewById(R.id.btnTry);

    btnAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            //The integer argument is a "request code" that identifies your request. When you receive the result Intent,
            // the callback provides the same request code so that your app can properly identify the result and determine how to handle it.

            Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(i ,RESULT_LOAD_IMAGE);
        }
    });
}

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

    if(requestCode == RESULT_LOAD_IMAGE && requestCode == RESULT_OK && null != data){
        Uri selectImage = data.getData();
        String[] filePathcolumn = {MediaStore.Images.Media.DATA};

        Cursor cursor = getContentResolver().query(selectImage , filePathcolumn , null , null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathcolumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        ImageView ivMemeImage = findViewById(R.id.ivMemeImage);

ivMemeImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));
    }
}
}

当我运行应用程序并点击添加按钮时图像未加载到图像视图中。我已经在清单中给出了读写权限。

Answer 1

您可以使用Uri显示图像。您只需设置imageView.setImageUri(selectedImage)

即可

if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null) {
  Uri selectedImage = data.getData();
  your_imageView.setImageURI(selectedImage);
}

Answer 2

这是你在android studio中完成的代码吗？

    if(requestCode == RESULT_LOAD_IMAGE && requestCode == RESULT_OK && null != data)

应该是

    if(requestCode == RESULT_LOAD_IMAGE && requestCode == RESULT_OK && data!=null)

您的代码应该给您编译时错误

Answer 3

查看Picasso图书馆.. http://square.github.io/picasso/

使用一行代码将图像从URI加载到imageview中：

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

无法从图库中加载图像

3 个答案: