Question

我需要实现这个场景，但我不知道如何处理它：

gridview

黑色矩形是两个网格视图，蓝色方块是图像，红色矩形仅用于显示占位符。

我需要在网格视图之间拖动图像以让用户选择4-5个图像（它们进入红色方块）...因此从上到下，从下到上拖动（选择和取消选择）。谁都可以帮帮我？

Answer 1

您可以通过在活动中实现OnTouchListener和OnDragListener轻松完成此操作。在drawable文件夹中创建shape_droptarget.xml和shape.xml。我已经为自己的工作实现了它。我希望它会给你一些帮助。

shape_droptarget.xml

<?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>

shape.xml

<?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>

在布局文件夹

中创建draglayout.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

  <GridLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@color/darkred"
      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: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: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:src="@drawable/ic_launcher" />
    </LinearLayout>

</GridLayout>
  <View
        android:layout_width="match_parent"
        android:layout_height="100dp"
    >
    </View>
  <GridLayout 
      android:background="@color/darkgreen"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:columnCount="4"
    android:columnWidth="300dp"
    android:orientation="horizontal"
    android:rowCount="1"
    android:stretchMode="columnWidth" >

    <LinearLayout
        android:id="@+id/topleft1"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="0"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage11"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/topright1"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="1"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage21"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/bottomleft1"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="2"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage31"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/bottomright1"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="3"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage41"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:src="@drawable/ic_launcher" />
    </LinearLayout>

</GridLayout>
</LinearLayout>

创建活动DragActivity

public class DragActivity extends Activity {



  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.draglayout);
    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());


    findViewById(R.id.myimage11).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.myimage21).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.myimage31).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.myimage41).setOnTouchListener(new MyTouchListener());
    findViewById(R.id.topleft1).setOnDragListener(new MyDragListener());
    findViewById(R.id.topright1).setOnDragListener(new MyDragListener());
    findViewById(R.id.bottomleft1).setOnDragListener(new MyDragListener());
    findViewById(R.id.bottomright1).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;
    }
  }
}

现在您可以将图像从一个网格移动到另一个网格以及网格内。

Android：在gridviews之间移动图像

1 个答案: