Android网格视图项目拖放重新排列和网格项目将其拖放到屏幕中的任何位置

Question

Android 网格视图拖放重新排列同时我想像绝对布局一样拖放屏幕中的任何位置。有可能实现吗？

Answer 1

试试这个库，它也有示例项目

DraggableGridView

尝试使用此库将项目从一页拖到另一页

PagedDragDropGrid

Answer 2

是的，有可能。这里很好tutorial。

在本教程中，他们使用以下代码：-

在您的 res 目录中创建可绘制文件夹。在此文件夹中创建以下 shape.xml 文件。

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <stroke
        android:width="2dp"
        android:color="#FFFFFFFF" />

    <gradient
        android:angle="225"
        android:endColor="#DD2ECCFA"
        android:startColor="#DD000000" />

    <corners
        android:bottomLeftRadius="7dp"
        android:bottomRightRadius="7dp"
        android:topLeftRadius="7dp"
        android:topRightRadius="7dp" />

</shape> 

// 在drawable文件夹中创建shape_droptarget.xml文件。

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <stroke
        android:width="2dp"
        android:color="#FFFF0000" />

    <gradient
        android:angle="225"
        android:endColor="#DD2ECCFA"
        android:startColor="#DD000000" />

    <corners
        android:bottomLeftRadius="7dp"
        android:bottomRightRadius="7dp"
        android:topLeftRadius="7dp"
        android:topRightRadius="7dp" />

</shape>

将 Activity 的布局更改为以下代码。

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="2"
    android:columnWidth="300dp"
    android:orientation="vertical"
    android:rowCount="2"
    android:stretchMode="columnWidth" >

    <LinearLayout
        android:id="@+id/topleft"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="0"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/topright"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="1"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/bottomleft"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="0"
        android:layout_row="1"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/bottomright"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="1"
        android:layout_row="1"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

</GridLayout>

将您的活动类更改为以下代码。

public class DragActivity extends Activity {

/** Called when the activity is first created. */

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    findViewById(R.id.myimage1).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.myimage2).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.myimage3).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.myimage4).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.topleft).setOnDragListener(new MyDragListener());
    findViewById(R.id.topright).setOnDragListener(new MyDragListener());
    findViewById(R.id.bottomleft).setOnDragListener(new MyDragListener());
    findViewById(R.id.bottomright).setOnDragListener(new MyDragListener());

  }

  private final class MyTouchListener implements OnTouchListener {
    public boolean onTouch(View view, MotionEvent motionEvent) {
      if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
        ClipData data = ClipData.newPlainText("", "");
        DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
        view.startDrag(data, shadowBuilder, view, 0);
        view.setVisibility(View.INVISIBLE);
        return true;
      } else {
        return false;
      }
    }
  }

  class MyDragListener implements OnDragListener {
    Drawable enterShape = getResources().getDrawable(R.drawable.shape_droptarget);
    Drawable normalShape = getResources().getDrawable(R.drawable.shape);

    @Override
    public boolean onDrag(View v, DragEvent event) {
      int action = event.getAction();
      switch (event.getAction()) {
      case DragEvent.ACTION_DRAG_STARTED:
        // do nothing
        break;
      case DragEvent.ACTION_DRAG_ENTERED:
        v.setBackgroundDrawable(enterShape);
        break;
      case DragEvent.ACTION_DRAG_EXITED:
        v.setBackgroundDrawable(normalShape);
        break;
      case DragEvent.ACTION_DROP:
        // Dropped, reassign View to ViewGroup
        View view = (View) event.getLocalState();
        ViewGroup owner = (ViewGroup) view.getParent();
        owner.removeView(view);
        LinearLayout container = (LinearLayout) v;
        container.addView(view);
        view.setVisibility(View.VISIBLE);
        break;
      case DragEvent.ACTION_DRAG_ENDED:
        v.setBackgroundDrawable(normalShape);
      default:
        break;
      }
      return true;
    }
  }
}

如果您启动此活动，您应该能够将 ImageViews 拖到另一个容器中。