代码之家  ›  专栏  ›  技术社区  ›  Flutterian

Android-Textview在拖动操作中消失了

textview drag-and-drop android
  •  10
  • Flutterian  · 技术社区  · 8 年前

    我正在创建一个图像编辑应用程序。在其中我可以打开相机或图库来选择图片。选择图片后,用户将导航到其他页面。在另一个页面显示图片我使用了一个实现 AppCompactImageView TextView . 现在我想把这个文本视图拖到整个布局中。但是在手术后,它就消失了。下面是我的代码。任何帮助都是值得赞赏的。

    1. DrawActivity.java

      public class DrawActivity extends 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. <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>

    2 回复  |  直到 8 年前
        1
  •  2
  •   Niza Siwale    8 年前

    你应该设置 X Y

    再次更新 drop视图是您的textview应该被放入的地方。这将保持拖动侦听器 

    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;
            }
        });
        2
  •  2
  •   Mr.O    8 年前

    对于初学者来说,拖动并将拖动侦听器设置在同一视图上,通常拖动侦听器是另一个视图,而不是被移动的视图,以便在其上方、进入或退出等情况下监听被拖动视图的移动。 我认为你应该这样做:

    编辑2: 

    //TODO change the view that listens to the drag event to root view layout
RelativeLayout layout = findViewById(R.id.yourRootViewLayout) //Change this to your root layout
layout.setOnDragListener(new View.OnDragListener() {
   //I changed the view that listens to the dragging, 
  //not sure if that's the one you prefer but you can choose your own 
 //to listen to these events if it overlaps or not, etc.
        @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");
                    // 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;

          //I put the code that you had in exited in ended because that's what 
          //listens to when  the drag stops no matter where it is
                case DragEvent.ACTION_DRAG_ENDED   :
                    Log.d("Vishal Drag", "Action is DragEvent.ACTION_DRAG_ENDED");
                    x_cord = (int) event.getX();
                    y_cord = (int) event.getY();
                    //TODO change the code below
                    View newView = (View) event.getLocalState();
                    ViewGroup owner = (ViewGroup) newView.getParent();
                    owner.removeView(newView);
                    RelativeLayout container = (RelativeLayout) v;
                    container.addView(newView);
                    newView.setVisibility(View.VISIBLE);
                    newView.setX(x_cord);
                    newView.setY(y_cord);
                    return true;

                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;
        }
    });


    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);
        //I changed addedTxtView to the current view being clicked
        View.DragShadowBuilder myShadow = new View.DragShadowBuilder(v);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            Log.d("Vishal sdk","in if");
            //TODO Edit added v instead of null
            v.startDragAndDrop(dragData, myShadow, v, 0);
        } else {
            Log.d("Vishal sdk","in else");
            //TODO Edit added v instead of null
            v.startDrag(dragData, myShadow, v, 0);
        }
        //Let addedTxtView be invisible so there aren't two views at the same time
        addedTxtView.setVisibility(View.INVISIBLE);
        return false;
    }
});

    我还编辑了上面的部分:如果拖动事件ACTION\u Drag\u结束,我让addedTextView在拖动结束后再次可见。

    推荐文章
    KDeveloper  ·  在android中集成instagram这样的标签拖放功能?
    4 年前
    manymanymore  ·  如何在Qt中将QLabel从一个窗口拖动到另一个窗口?
    8 年前
    egzonmustafa  ·  拖放HTML(占位符)
    8 年前
    user9328640  ·  拖放并验证
    8 年前
    Sebi95  ·  三DragControl不是构造函数错误
    8 年前
    John Balvin Arias  ·  如何通过拖放获取文件,与输入类似。文件
    8 年前
    Borja  ·  拖放div
    8 年前
    Héctor M.  ·  是否可以在C#Winforms中实现一个将元素重新组织为Android的函数
    8 年前
    Alexey Chekanov  ·  如果项目未移动,是否有方法检查UICollectionView项目拖动取消?
    8 年前
    Redas Shuliakas  ·  Libgdx拖放,如何同步光标和精灵/演员?
    8 年前
    关于   移动版
    代码之家 - 一站式码农服务社区
    沪ICP备11025650号