Cách kéo TextView vào đúng mục tiêu TextView khác

Question

Tôi đã đưa ra mã đầy đủ mà tôi có.

Mã dưới đây có thể kéo và thả rất trơn tru nhưng nó không hoạt động như những gì tôi cần như mô tả dưới đây.

1. Kéo dữ liệu là (Apple, Orage, Ball)
2. Drop vị trí mục tiêu là (A, O cho, B)

Vì vậy, nếu kéo "Apple" thả "A cho "nó sẽ là CHỈNH SỬA và cập nhật văn bản thành" A cho Apple "và Text" Apple "lúc kéo sẽ ẩn ... nhưng nếu chúng ta kéo" Apple "thả xuống" O cho "hoặc" B cho "nó sẽ thất bại bởi vì "O cho Orange" và "B for Ball".

Dựa trên mã bên dưới những gì tôi nên thêm.

Layout:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:orientation="vertical" 
android:padding="10dp" 
android:paddingLeft="50dp" 
android:paddingRight="50dp" > 


<TextView 
    android:id="@+id/option_1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="5dp" 
    android:background="@drawable/option" 
    android:gravity="center" 
    android:text="Apple" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/option_2" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="5dp" 
    android:background="@drawable/option" 
    android:gravity="center" 
    android:text="Orange" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/option_3" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="5dp" 
    android:background="@drawable/option" 
    android:gravity="center" 
    android:text="Ball" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/choice_1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="5dp" 
    android:background="@drawable/choice" 
    android:gravity="center" 
    android:text="A for " /> 

<TextView 
    android:id="@+id/choice_2" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="5dp" 
    android:background="@drawable/choice" 
    android:gravity="center" 
    android:text="O for" /> 

<TextView 
    android:id="@+id/choice_3" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="5dp" 
    android:background="@drawable/choice" 
    android:gravity="center" 
    android:text="B for " /> 

</LinearLayout> 

Acvitity:

public class picture_to_word_24_color extends Activity { 

//text views being dragged and dropped onto 
private TextView option1, option2, option3, choice1, choice2, choice3; 
public CharSequence dragData; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.picture_to_word_24_color); 

    //get both sets of text views 

    //views to drag 
    option1 = (TextView)findViewById(R.id.option_1); 
    option2 = (TextView)findViewById(R.id.option_2); 
    option3 = (TextView)findViewById(R.id.option_3); 

    //views to drop onto 
    choice1 = (TextView)findViewById(R.id.choice_1); 
    choice2 = (TextView)findViewById(R.id.choice_2); 
    choice3 = (TextView)findViewById(R.id.choice_3); 

    //set touch listeners 
    option1.setOnTouchListener(new ChoiceTouchListener()); 
    option2.setOnTouchListener(new ChoiceTouchListener()); 
    option3.setOnTouchListener(new ChoiceTouchListener()); 

    //set drag listeners 
    choice1.setOnDragListener(new ChoiceDragListener()); 
    choice2.setOnDragListener(new ChoiceDragListener()); 
    choice3.setOnDragListener(new ChoiceDragListener()); 
} 

/** 
* ChoiceTouchListener will handle touch events on draggable views 
* 
*/ 
private final class ChoiceTouchListener implements OnTouchListener { 
    @SuppressLint("NewApi") 
    public boolean onTouch(View view, MotionEvent motionEvent) { 
     if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) { 
      /* 
      * Drag details: we only need default behavior 
      * - clip data could be set to pass data as part of drag 
      * - shadow can be tailored 
      */ 
      ClipData data = ClipData.newPlainText("", ""); 
      DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view); 
      //start dragging the item touched 
      view.startDrag(data, shadowBuilder, view, 0); 
      return true; 
     } else { 
      return false; 
     } 
    } 
} 

/** 
* DragListener will handle dragged views being dropped on the drop area 
* - only the drop action will have processing added to it as we are not 
* - amending the default behavior for other parts of the drag process 
* 
*/ 
@SuppressLint("NewApi") 
private class ChoiceDragListener implements OnDragListener { 

    @Override 
    public boolean onDrag(View v, DragEvent event) { 
     switch (event.getAction()) { 
     case DragEvent.ACTION_DRAG_STARTED: 
      //no action necessary 
      break; 
     case DragEvent.ACTION_DRAG_ENTERED: 
      //no action necessary 
      Toast.makeText(picture_to_word_24_color.this, "ACTION_DRAG_ENTERED", Toast.LENGTH_SHORT).show(); 
      break; 
     case DragEvent.ACTION_DRAG_EXITED:   
      //no action necessary 
      Toast.makeText(picture_to_word_24_color.this, "ACTION_DRAG_EXITED", Toast.LENGTH_SHORT).show(); 
      break; 
     case DragEvent.ACTION_DROP: 

      Toast.makeText(picture_to_word_24_color.this, "ACTION_DROP", Toast.LENGTH_SHORT).show(); 
      //handle the dragged view being dropped over a drop view 
      View view = (View) event.getLocalState(); 
      //stop displaying the view where it was before it was dragged 
      view.setVisibility(View.INVISIBLE); 
      //view dragged item is being dropped on 
      TextView dropTarget = (TextView) v; 
      //view being dragged and dropped 
      TextView dropped = (TextView) view; 
      //update the text in the target view to reflect the data being dropped 
      dropTarget.setText(dropped.getText()); 
      //make it bold to highlight the fact that an item has been dropped 
      dropTarget.setTypeface(Typeface.DEFAULT_BOLD); 
      //if an item has already been dropped here, there will be a tag 
      Object tag = dropTarget.getTag(); 
      //if there is already an item here, set it back visible in its original place 
      if(tag!=null) 
      { 
       //the tag is the view id already dropped here 
       int existingID = (Integer)tag; 
       //set the original view visible again 
       findViewById(existingID).setVisibility(View.VISIBLE); 
      } 
      //set the tag in the target view being dropped on - to the ID of the view being dropped 
      dropTarget.setTag(dropped.getId()); 
      break; 
     case DragEvent.ACTION_DRAG_ENDED: 
      //no action necessary 
      Toast.makeText(picture_to_word_24_color.this, "ACTION_DRAG_ENDED", Toast.LENGTH_SHORT).show(); 
      break; 
     default: 
      break; 
     } 
     return true; 
    } 
} 
} 

Answer 1

Hãy thử đoạn mã sau, nó sẽ hoạt động theo mô tả của bạn trong câu hỏi. Tôi đã thêm một điều bổ sung tức là nút đặt lại khi tôi cảm thấy cần thiết.

picture_to_word_24_color.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" 
android:padding="10dp" 
android:paddingLeft="50dp" 
android:paddingRight="50dp" > 


<TextView 
android:id="@+id/option_1" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="5dp" 
android:background="@drawable/option" 
android:gravity="center" 
android:text="Apple" 
android:textStyle="bold" /> 

<TextView 
android:id="@+id/option_2" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="5dp" 
android:background="@drawable/option" 
android:gravity="center" 
android:text="Orange" 
android:textStyle="bold" /> 

<TextView 
android:id="@+id/option_3" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="5dp" 
android:background="@drawable/option" 
android:gravity="center" 
android:text="Ball" 
android:textStyle="bold" /> 

<TextView 
android:id="@+id/choice_1" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="5dp" 
android:background="@drawable/choice" 
android:gravity="center" 
android:text="A for " /> 

<TextView 
android:id="@+id/choice_2" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="5dp" 
android:background="@drawable/choice" 
android:gravity="center" 
android:text="O for " /> 

<TextView 
android:id="@+id/choice_3" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="5dp" 
android:background="@drawable/choice" 
android:gravity="center" 
android:text="B for " /> 

<Button 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="Reset" 
android:onClick="reset"/> 

</LinearLayout> 

Picture_to_word_24_color.java

package com.example.touchanddrag; 

import android.os.Build; 
import android.os.Bundle; 
import android.annotation.SuppressLint; 
import android.annotation.TargetApi; 
import android.app.Activity; 
import android.content.ClipData; 
import android.graphics.Typeface; 
import android.view.DragEvent; 
import android.view.Menu; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.DragShadowBuilder; 
import android.view.View.OnDragListener; 
import android.view.View.OnTouchListener; 
import android.widget.TextView; 
import android.widget.Toast; 

@SuppressLint("NewApi") 
public class Picture_to_word_24_color extends Activity { 

private TextView option1, option2, option3, choice1, choice2, choice3; 
public CharSequence dragData; 

@TargetApi(Build.VERSION_CODES.HONEYCOMB) 
@SuppressLint("NewApi") 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.picture_to_word_24_color); 

    //get both sets of text views 

    //views to drag 
    option1 = (TextView)findViewById(R.id.option_1); 
    option2 = (TextView)findViewById(R.id.option_2); 
    option3 = (TextView)findViewById(R.id.option_3); 

    //views to drop onto 
    choice1 = (TextView)findViewById(R.id.choice_1); 
    choice2 = (TextView)findViewById(R.id.choice_2); 
    choice3 = (TextView)findViewById(R.id.choice_3); 

    //set touch listeners 
    option1.setOnTouchListener(new ChoiceTouchListener()); 
    option2.setOnTouchListener(new ChoiceTouchListener()); 
    option3.setOnTouchListener(new ChoiceTouchListener()); 

    //set drag listeners 
    choice1.setOnDragListener(new ChoiceDragListener()); 
    choice2.setOnDragListener(new ChoiceDragListener()); 
    choice3.setOnDragListener(new ChoiceDragListener()); 
} 

/** 
* ChoiceTouchListener will handle touch events on draggable views 
* 
*/ 
private final class ChoiceTouchListener implements OnTouchListener { 
    @SuppressLint("NewApi") 
    @Override 
    public boolean onTouch(View view, MotionEvent motionEvent) { 
     if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) { 
      /* 
      * Drag details: we only need default behavior 
      * - clip data could be set to pass data as part of drag 
      * - shadow can be tailored 
      */ 
      ClipData data = ClipData.newPlainText("", ""); 
      DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view); 
      //start dragging the item touched 
      view.startDrag(data, shadowBuilder, view, 0); 
      return true; 
     } else { 
      return false; 
     } 
    } 
} 

/** 
* DragListener will handle dragged views being dropped on the drop area 
* - only the drop action will have processing added to it as we are not 
* - amending the default behavior for other parts of the drag process 
* 
*/ 
@SuppressLint("NewApi") 
private class ChoiceDragListener implements OnDragListener { 

    @Override 
    public boolean onDrag(View v, DragEvent event) { 
     switch (event.getAction()) { 
     case DragEvent.ACTION_DRAG_STARTED: 
      //no action necessary 
      break; 
     case DragEvent.ACTION_DRAG_ENTERED: 
      //no action necessary 
      break; 
     case DragEvent.ACTION_DRAG_EXITED:   
      //no action necessary 
      break; 
     case DragEvent.ACTION_DROP: 

      //handle the dragged view being dropped over a drop view 
      View view = (View) event.getLocalState(); 
      //view dragged item is being dropped on 
      TextView dropTarget = (TextView) v; 
      //view being dragged and dropped 
      TextView dropped = (TextView) view; 
      //checking whether first character of dropTarget equals first character of dropped 
      if(dropTarget.getText().toString().charAt(0) == dropped.getText().toString().charAt(0)) 
      { 
       //stop displaying the view where it was before it was dragged 
       view.setVisibility(View.INVISIBLE); 
       //update the text in the target view to reflect the data being dropped 
       dropTarget.setText(dropTarget.getText().toString() + dropped.getText().toString()); 
       //make it bold to highlight the fact that an item has been dropped 
       dropTarget.setTypeface(Typeface.DEFAULT_BOLD); 
       //if an item has already been dropped here, there will be a tag 
       Object tag = dropTarget.getTag(); 
       //if there is already an item here, set it back visible in its original place 
       if(tag!=null) 
       { 
        //the tag is the view id already dropped here 
        int existingID = (Integer)tag; 
        //set the original view visible again 
        findViewById(existingID).setVisibility(View.VISIBLE); 
       } 
       //set the tag in the target view being dropped on - to the ID of the view being dropped 
       dropTarget.setTag(dropped.getId()); 
       //remove setOnDragListener by setting OnDragListener to null, so that no further drag & dropping on this TextView can be done 
       dropTarget.setOnDragListener(null); 
      } 
      else 
       //displays message if first character of dropTarget is not equal to first character of dropped 
       Toast.makeText(Picture_to_word_24_color.this, dropTarget.getText().toString() + "is not " + dropped.getText().toString(), Toast.LENGTH_LONG).show(); 
      break; 
     case DragEvent.ACTION_DRAG_ENDED: 
      //no action necessary 
      break; 
     default: 
      break; 
     } 
     return true; 
    } 
} 

public void reset(View view) 
{ 
    option1.setVisibility(TextView.VISIBLE); 
    option2.setVisibility(TextView.VISIBLE); 
    option3.setVisibility(TextView.VISIBLE); 

    choice1.setText("A for "); 
    choice2.setText("O for "); 
    choice3.setText("B for "); 

    choice1.setTag(null); 
    choice2.setTag(null); 
    choice3.setTag(null); 

    choice1.setTypeface(Typeface.DEFAULT); 
    choice2.setTypeface(Typeface.DEFAULT); 
    choice3.setTypeface(Typeface.DEFAULT); 

    choice1.setOnDragListener(new ChoiceDragListener()); 
    choice2.setOnDragListener(new ChoiceDragListener()); 
    choice3.setOnDragListener(new ChoiceDragListener()); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.picture_to_word_24_color, menu); 
    return true; 
} 

} 

Đừng quên để kiểm tra mức độ mục tiêu API. Vì tôi phải thêm @SuppressLint("NewApi")