public class BrowsePictureActivity extends Activity{

private static final int SELECT_PICTURE = 1;

private String selectedImagePath;
private ImageView imageView;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.browsepicture);
    imageView = (ImageView)findViewById(R.id.imageView1);

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

                public void onClick(View arg0) {
                    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();
            if (Build.VERSION.SDK_INT < 19) {
                selectedImagePath = getPath(selectedImageUri);
                Bitmap bitmap = BitmapFactory.decodeFile(selectedImagePath);
                imageView.setImageBitmap(bitmap);

            }
            else {
                ParcelFileDescriptor parcelFileDescriptor;
                try {
                    parcelFileDescriptor = getContentResolver().openFileDescriptor(selectedImageUri,"r");
                    FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
                    Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
                    parcelFileDescriptor.close();
                    imageView.setImageBitmap(image);

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}

/**
 * helper to retrieve the path of an image URI
 */
public String getPath(Uri uri) {
        if( uri == null ) {
            return null;
        }
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(uri,projection,null,null);
        if( cursor != null ){
            int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        }
        return uri.getPath();
}

}

您需要添加权限

< uses-permission android：name =“android.permission.READ_EXTERNAL_STORAGE”/>