Android-Textview 在拖动操作时消失

Question

我正在创建一个图像编辑应用程序。我在其中提供了打开相机或画廊以选择图片的便利。选择图片后，用户将导航到其他页面。在其他显示图片的页面中，我使用了一个实现了 AppCompactImageView 的 View 。现在，我正在提供使用 edittext 添加文本的便利。单击软键盘的“完成”按钮时，edittext 将消失并被 TextView 取代。现在我想将这个 TextView 拖到整个布局中。但是在 drop 操作之后，它就消失了。下面是我的代码。任何帮助都将不胜感激。

1. DrawActivity.java

   公共(public)类 DrawActivity 扩展 AppCompatActivity {

   DrawView imgView;
   Button resetBtn, saveBtn;
   ImageButton undoBtn;
   Bundle extras;
   Context context;
   EditText addTxtBox;
   ImageView brushImg, fontImg;
   TextView addedTxtView;
   // LinearLayout mainLinear;
   RelativeLayout mainRelative;
   public int rowX, rowY;
   public String txtVal;
   private android.widget.RelativeLayout.LayoutParams layoutParams;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       getSupportActionBar().hide();
       setContentView(R.layout.activity_draw);
   
       context = this.getApplicationContext();
   
       mainRelative = (RelativeLayout) findViewById(R.id.relativeLayout1);
       imgView = (DrawView) findViewById(R.id.frag_home_iv_main);
       resetBtn = (Button) findViewById(R.id.clearBtn);
       undoBtn = (ImageButton) findViewById(R.id.undoBtn);
       saveBtn = (Button) findViewById(R.id.saveBtn);
       addTxtBox = (EditText) findViewById(R.id.addTxt);
       brushImg = (ImageView) findViewById(R.id.imageBrush);
       fontImg = (ImageView) findViewById(R.id.imageFont);
   
       addedTxtView = (TextView) findViewById(R.id.drawTextView);
       addedTxtView.setOnLongClickListener(new View.OnLongClickListener() {
           @Override
           public boolean onLongClick(View v) {
               ClipData.Item item = new ClipData.Item((CharSequence)v.getTag());
               String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
   
               ClipData dragData = new ClipData(v.getTag().toString(),mimeTypes, item);
               View.DragShadowBuilder myShadow = new View.DragShadowBuilder(addedTxtView);
               if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                   Log.d("Vishal sdk","in if");
                   v.startDragAndDrop(dragData, myShadow, null, 0);
               } else {
                   Log.d("Vishal sdk","in else");
                   v.startDrag(dragData, myShadow, null, 0);
               }
               return false;
           }
       });
   
   
       addedTxtView.setOnDragListener(new View.OnDragListener() {
           @Override
           public boolean onDrag(View v, DragEvent event) {
               Log.d("Vishal check", String.valueOf(event.getAction()));
               switch(event.getAction()) {
                   case DragEvent.ACTION_DRAG_STARTED:
                       layoutParams = (RelativeLayout.LayoutParams)v.getLayoutParams();
                       Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_STARTED");
                       return true;
                       // Do nothing
   
                   case DragEvent.ACTION_DRAG_ENTERED:
                       Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_ENTERED");
                       int x_cord = (int) event.getX();
                       int y_cord = (int) event.getY();
                       return true;
   
                   case DragEvent.ACTION_DRAG_EXITED :
                       Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_EXITED");
                       x_cord = (int) event.getX();
                       y_cord = (int) event.getY();
                       layoutParams.leftMargin = x_cord;
                       layoutParams.topMargin = y_cord;
                       v.setLayoutParams(layoutParams);
                       v.setVisibility(View.VISIBLE);
                       // view.setVisibility(View.VISIBLE);
                       return true;
   
                   case DragEvent.ACTION_DRAG_LOCATION  :
                       Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_LOCATION");
                       x_cord = (int) event.getX();
                       y_cord = (int) event.getY();
                       return true;
   
                   case DragEvent.ACTION_DRAG_ENDED   :
                       Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_ENDED");
                       return true;
                       // Do nothing
   
                   case DragEvent.ACTION_DROP:
                       Log.d("Vishal Drag", "ACTION_DROP event");
                      /* x_cord = (int) event.getX();
                       y_cord = (int) event.getY();
                       View view = (View) event.getLocalState();
                       view.setX(x_cord - (view.getWidth() / 2));
                       view.setY(y_cord - (view.getWidth() / 2));
                       view.setVisibility(View.VISIBLE);*/
   
                       return true;
                       // Do nothing
                   default:
                       return true;
   
               }
               //return true;
           }
       });
   
   
       addTxtBox.setImeOptions(EditorInfo.IME_ACTION_DONE);
       addTxtBox.setRawInputType(InputType.TYPE_CLASS_TEXT);
   
       addTxtBox.setVisibility(View.GONE);
       // addedTxtView.setVisibility(View.GONE);
   
   
       extras = getIntent().getExtras();
       imgView.setImageURI(Uri.parse(extras.getString("selectedImg")));
   
       imgView.setDrawingCacheEnabled(true);
   
       brushImg.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               imgView.setBrushActive(true);
           }
       });
   
       fontImg.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               imgView.setBrushActive(false);
               addTxtBox.setVisibility(View.VISIBLE);
               addTxtBox.requestFocus();
               InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
               imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,InputMethodManager.HIDE_IMPLICIT_ONLY);
           }
       });
   
       addTxtBox.setOnEditorActionListener(new TextView.OnEditorActionListener() {
           @Override
           public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
               if (actionId == EditorInfo.IME_ACTION_DONE) {
                   Toast.makeText(DrawActivity.this, addTxtBox.getText(), Toast.LENGTH_SHORT).show();
                   addedTxtView.setVisibility(View.VISIBLE);
                   txtVal = addTxtBox.getText().toString();
                   imgView.getTxtValue(addTxtBox.getText().toString());
                   addedTxtView.setText(addTxtBox.getText().toString());
                   addedTxtView.setTag(addTxtBox.getText().toString());
                   addTxtBox.setVisibility(View.GONE);
                   try {
                       InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
                       inputMethodManager.hideSoftInputFromWindow(addTxtBox.getWindowToken(), InputMethodManager.RESULT_UNCHANGED_SHOWN);
                   }catch (Exception e){
                       e.printStackTrace();
                   }
                   return true;
               }
               return false;
           }
       });
   
   
       resetBtn.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               imgView.resetPaths();
           }
       });
   
       undoBtn.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               imgView.removeLastPath();
           }
       });
   
       saveBtn.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               Bitmap bitmap = imgView.getDrawingCache();
               File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
               path.mkdirs();
               Long tsLong = System.currentTimeMillis()/1000;
               String ts = tsLong.toString();
               File imageFile = new File(path, ts+".png"); // Imagename.png
   
               try{
                   FileOutputStream out = new FileOutputStream(imageFile);
                   bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); // Compress Image
                   try {
                       out.flush();
                       out.close();
                   } catch (IOException e){
                       e.printStackTrace();
                   }
   
   
                   // Tell the media scanner about the new file so that it is
                   // immediately available to the user.
                   MediaScannerConnection.scanFile(context,new String[] { imageFile.getAbsolutePath() }, null,new MediaScannerConnection.OnScanCompletedListener() {
                       public void onScanCompleted(String path, Uri uri) {
                           Log.i("ExternalStorage", "Scanned " + path + ":");
                           Log.i("ExternalStorage", "-> uri=" + uri);
   
                       }
                   });
                   Toast.makeText(context,"Saved", Toast.LENGTH_SHORT).show();
   
                   Intent intent = new Intent(DrawActivity.this, MainActivity.class);
                   startActivity(intent);
               } catch(FileNotFoundException e) {
                   Toast.makeText(context,"Error" + e.toString(), Toast.LENGTH_SHORT).show();
                   e.printStackTrace();
               }
           }
       });
   
   }
   
   
   
   public void redrawImage() {
       Bitmap bm = imgView.getDrawingCache();
       Bitmap proxy = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888);
       Canvas c = new Canvas(proxy);
       Paint paint = new Paint();
       // paint.setStyle(Paint.Style.STROKE);
       paint.setColor(Color.RED);
       paint.setTextSize(100);
       paint.setAntiAlias(true);
   
       c.drawBitmap(bm, new Matrix(), paint);
       c.drawText(txtVal, imgView.getWidth()+rowX, imgView.getHeight()+rowY, paint);
       imgView.setImageBitmap(proxy);
   }
   
   public void changeColor(View view) {
       Log.d("Vishal selected color", view.getTag().toString());
   
       switch (view.getTag().toString()){
           case "red":
               imgView.setBrushColor(Color.RED);
               break;
   
           case "blue":
               imgView.setBrushColor(Color.BLUE);
               break;
   
           case "green" :
               imgView.setBrushColor(Color.GREEN);
               break;
   
           case "yellow":
               imgView.setBrushColor(Color.YELLOW);
               break;
   
           case "purple":
               imgView.setBrushColor(getResources().getColor(R.color.purple));
               break;
   
           default:
               imgView.setBrushColor(Color.BLACK);
       }
       //
   }
   

2. activity_draw.xml

   <RelativeLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:background="@android:color/black" >
   
       <ImageButton
           android:id="@+id/undoBtn"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignParentLeft="true"
           android:src="@drawable/undo"/>
   
       <Button
           android:id="@+id/clearBtn"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Clear"
           android:layout_toLeftOf="@+id/saveBtn"/>
   
       <Button
           android:id="@+id/saveBtn"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Save"
           android:layout_alignParentRight="true"/>
   
   </RelativeLayout>
   
   <RelativeLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_weight="1.8"
       android:orientation="vertical"
       android:id="@+id/draw_image_linearView">
   
       <RelativeLayout
           android:id="@+id/relativeLayout1"
           android:layout_width="match_parent"
           android:layout_height="wrap_content">
   
           <com.example.mobilesolution.imgedit.DrawView
               android:id="@+id/frag_home_iv_main"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
               android:adjustViewBounds="true"
               android:scaleType="fitXY"/>
   
           <TextView
               android:id="@+id/drawTextView"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:elevation="100dp"
               android:layout_centerInParent="true"
               android:textColor="@android:color/black"
               android:textSize="16dp"
               />
   
           <EditText
               android:id="@+id/addTxt"
               android:layout_centerInParent="true"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:hint="Enter some text"
               android:inputType="textMultiLine"
               android:maxLines="3"
               android:elevation="10dp"/>
   
   
       </RelativeLayout>
   
   </RelativeLayout>
   
   <HorizontalScrollView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:fillViewport="true"
       android:paddingLeft="5dp"
       android:paddingRight="5dp"
       android:paddingTop="5dp"
       android:scrollbars="none"
       android:layout_weight="0.2">
   
       <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:orientation="vertical">
   
           <LinearLayout
               android:layout_width="447dp"
               android:layout_height="match_parent"
               android:gravity="center"
               android:orientation="horizontal"
               android:padding="10dp">
   
               <ImageView
                   android:id="@+id/redBall"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:onClick="changeColor"
                   android:src="@drawable/red_ball"
                   android:tag="red" />
   
               <ImageView
                   android:id="@+id/blueBall"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:onClick="changeColor"
                   android:src="@drawable/blue_ball"
                   android:tag="blue" />
   
               <ImageView
                   android:id="@+id/greenBall"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:onClick="changeColor"
                   android:src="@drawable/green_ball"
                   android:tag="green" />
   
               <ImageView
                   android:id="@+id/yellowBall"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:onClick="changeColor"
                   android:src="@drawable/yellow_ball"
                   android:tag="yellow" />
   
               <ImageView
                   android:id="@+id/purpleBall"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:onClick="changeColor"
                   android:src="@drawable/purple_ball"
                   android:tag="purple" />
   
               <ImageView
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:src="@drawable/red_ball" />
   
               <ImageView
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:src="@drawable/red_ball" />
   
               <ImageView
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:src="@drawable/red_ball" />
   
               <ImageView
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:src="@drawable/green_ball" />
   
               <ImageView
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginRight="10dp"
                   android:src="@drawable/green_ball" />
   
           </LinearLayout>
       </LinearLayout>
   
   
   </HorizontalScrollView>
   
   
   <RelativeLayout
       android:id="@+id/brushBtnLayout"
       android:layout_width="wrap_content"
       android:layout_height="48dp"
       android:background="@android:color/black">
   
       <ImageView
           android:id="@+id/imageBrush"
           android:layout_width="65dp"
           android:layout_height="37dp"
           android:layout_marginLeft="66dp"
           android:layout_marginStart="66dp"
           android:background="@android:color/white"
           android:src="@drawable/brush"
           android:layout_alignTop="@+id/imageFont"
           android:layout_alignParentLeft="true"
           android:layout_alignParentStart="true" />
   
       <ImageView
           android:id="@+id/imageFont"
           android:layout_width="65dp"
           android:layout_height="37dp"
           android:layout_alignParentEnd="true"
           android:layout_alignParentRight="true"
           android:layout_centerVertical="true"
           android:layout_marginEnd="52dp"
           android:layout_marginRight="52dp"
           android:background="@android:color/white"
           android:src="@drawable/font" />
   
   </RelativeLayout>
   

Answer 1

当拖动存在时，您应该设置 X 和 Y 坐标，而不是设置边距。

再次更新 放置 View 是您的 TextView 应该放入的位置。这应该包含拖动监听器

frag_home_iv_main.setOnDragListener(new View.OnDragListener() {
            @Override
            public boolean onDrag(View view, DragEvent dragEvent) {
                int action = dragEvent.getAction();
                View viewdrag = (View) dragEvent.getLocalState();
                if(action == DragEvent.ACTION_DRAG_ENTERED){
                    //do something
                }
                else if(action == DragEvent.ACTION_DRAG_EXITED){
                    //do something

                    Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_EXITED");
                    x_cord = (int) event.getX();
                    y_cord = (int) event.getY();
                    viewdrag .setY(y_cord);
                    viewdrag .setX(x_cord);
                }

                else if(action == DragEvent.ACTION_DROP){
                    //do something
                }
                return true;
            }
        });