如何使浮动按钮消失android？答案

【问题标题】：How to make a floating button disappear android?如何使浮动按钮消失android？
【发布时间】：2020-01-14 23:48:16
【问题描述】：

我有一个简单的浮动按钮，可以打开相机，然后在 Main Activity 中显示图像。

我想在用户检索图像结果后立即删除该浮动按钮，因此它应该是 onActivityResult 紧跟在 scannedImageView.setImageBitmap(bitmap) 之后

我尝试使用btnFloat.setVisibility(View.GONE);，但由于它是一个浮动按钮，我不知道如何在我的方法中调用它。

MainActivity

ImageView scannedImageView;

public void init() {
FloatingActionButton fab = findViewById(R.id.fab_capture);
}

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     super.onActivityResult(requestCode, resultCode, data);
     if (resultCode == Activity.RESULT_OK && data != null) {
         if (requestCode == OPEN_THING) {
             Uri uri = data.getExtras().getParcelable(ScanConstants.SCANNED_RESULT);
             Bitmap bitmap = null;
             try {
                 bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
                 getContentResolver().delete(uri, null, null);
                 scannedImageView.setImageBitmap(bitmap);
               //btnFloat.setVisibility(View.GONE);
                 FileOutputStream outputStream = null;
                 File sdCard = new File(getExternalFilesDir(null).getAbsolutePath());
                 File directory = new File (sdCard.getAbsolutePath() +"/Scan Documents");
                 directory.mkdir();

                 String filename = String.format("d.jpg", System.currentTimeMillis());
                 File outFile = new File(directory, filename);

                 Toast.makeText(this, "Image Saved Successfully", Toast.LENGTH_SHORT).show();

                 Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
                 intent.setData(Uri.fromFile(outFile));
                 sendBroadcast(intent);

                 try{
                     outputStream = new FileOutputStream(outFile);
                     bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                     outputStream.flush();
                     outputStream.close();

                 }catch (FileNotFoundException e)
                 {
                     e.printStackTrace();
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }
 }

【问题讨论】：

标签： java android android-button onactivityresult

【解决方案1】：

将 FloatingActionButton 设为全局成员变量，然后您可以访问它在 onActivityResult

public class MyActivity extends Activity {
 ...
FloatingActionButton fab;

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    fab = findViewById(R.id.fab_capture);
}



 protected void onActivityResult(int requestCode, int resultCode,
         Intent data) {
  ...
    fab.hide();
   ...
 }
}

【讨论】：