我正在使用自定义视图TouchImageView。但是，当我设置位图时，它不会显示图像，除非我对其进行捏合手势。
public class PhotoOverlayActivity extends AppCompatActivity {
public static final String CURRENT_MESSAGE_KEY = "message";
private static final int IMAGE_REQUEST_CODE = 0;
String currentMessage;
private Bitmap bitmap;
private TouchImageView mImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_photo_overlay);
setupToolbar();
setupImageView();
currentMessage = getIntent().getStringExtra(CURRENT_MESSAGE_KEY);
chooseImage();
}
private void setupToolbar() {
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setTitle("");
}
}
private void setupImageView() {
mImageView = findViewById(R.id.imageView);
}
private void chooseImage() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, IMAGE_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == IMAGE_REQUEST_CODE && resultCode == Activity.RESULT_OK)
try {
if (bitmap != null) {
bitmap.recycle();
}
InputStream stream = getContentResolver().openInputStream(data.getData());
bitmap = BitmapFactory.decodeStream(stream);
stream.close();
int nh = (int) (bitmap.getHeight() * (512.0 / bitmap.getWidth()));
Bitmap scaled = Bitmap.createScaledBitmap(bitmap, 512, nh, true);
mImageView.setImageBitmap(scaled);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
super.onActivityResult(requestCode, resultCode, data);
}
}
我终于找到了埋在这里的解决方案，所以我在下面发布我的答案。