拖放在relativelayout中

时间:2014-05-22 10:23:15

标签: java android

我对java和android编程的知识非常有限(不是来自prog背景)。如果可能的话,请在外行中解释。基本上,我试图制作一个麻将牌,我可以随意移动。我想解决以下问题:

  1. 我已经通过XML为我的按钮(在屏幕底部)设置了初始布局。拖动按钮时,按钮将跳转到屏幕顶部。我尝试使用.getX()而不是.getRawX(),但按钮将以混乱的模式移动。而模拟器非常慢。

  2. 如何为我创建的每个按钮设置边界?就像在我拖过其中一个按钮时,我不想让按钮相互重叠。所以这意味着如果我将瓷砖A移到瓷砖B上,瓷砖B将试图通过移开来避免重叠(或者更好的想法,参见3)。

  3. 需要大致了解如何使按钮在足够靠近时彼此对齐。意味着当我将瓷砖A移动到靠近瓷砖B时,瓷砖A将与瓷砖B并排排列。我不希望它们连接在一起(刚刚对齐),并且只需移动任何瓷砖就可以轻松打破它们

  4. 这里有关于拖放的代码,我在这个论坛中引用了某人的参考:

    @Override
    public boolean onTouch(View view, MotionEvent event) {
        final int X = (int) event.getRawX();  
        final int Y = (int) event.getRawY();      
    
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
             case MotionEvent.ACTION_DOWN:
                 RelativeLayout.LayoutParams Params = (RelativeLayout.LayoutParams) view.getLayoutParams();
                    xDelta = X - Params.leftMargin;
                    yDelta = Y - Params.topMargin;
    
                 break;
             case MotionEvent.ACTION_UP:
                 break;
             case MotionEvent.ACTION_POINTER_DOWN:
                 break;
              case MotionEvent.ACTION_POINTER_UP:
                 break;
              case MotionEvent.ACTION_MOVE:
                  //restrict image from going over the screen boundary
    
                  if ( (X - xDelta <= -5 || X - xDelta >= 390 ) ||
                       (Y - yDelta <= -5 || Y - yDelta >= 630 ) 
                      )
                      break;
    
    
                  //Goes back to default drag and drop sequence
                  else {
                  RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
                  layoutParams.leftMargin = X - xDelta;
                  layoutParams.topMargin = Y - yDelta;          
                  layoutParams.rightMargin = -10;
                  layoutParams.bottomMargin = -10;
    
                  view.setLayoutParams(layoutParams);
                  break;
                  }
          }
    
          environment.invalidate();
          return true;  
    }
    

1 个答案:

答案 0 :(得分:0)

在Android 2.2中拖放

在这里,我给出了能够让你获得成功的代码。我的主要课程就在这里

package info.tempDD;
 import android.app.Activity;
    import android.graphics.Rect;
    import android.graphics.drawable.Drawable;
    import android.os.Bundle;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnTouchListener;
    import android.view.ViewGroup;
    import android.view.ViewGroup.LayoutParams;
    import android.view.Window;
    import android.view.WindowManager;
    import android.widget.ImageView;
    import android.widget.RelativeLayout;

   public class TempDDActivity extends Activity implements OnTouchListener {
        /** Called when the activity is first created. */
        private View selected_item = null;
        private int offset_x = 0;
        private int offset_y = 0;
        Boolean touchFlag=false;
        boolean dropFlag=false;
        LayoutParams imageParams;
        ImageView imageDrop,image1,image2;
        int crashX,crashY;
        Drawable dropDrawable,selectDrawable;
        Rect dropRect,selectRect;
        int topy,leftX,rightX,bottomY;



int dropArray[];    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);
        ViewGroup container = (ViewGroup) findViewById(R.id.container);
        imageDrop=(ImageView) findViewById(R.id.ImgDrop);       
        image1=(ImageView) findViewById(R.id.img);      
        image2=(ImageView) findViewById(R.id.img2);
        container.setOnTouchListener(new View.OnTouchListener() 
        {
            public boolean onTouch(View v, MotionEvent event) 
            {
                if(touchFlag==true)
                {
                    System.err.println("Display If  Part ::->"+touchFlag);
                    switch (event.getActionMasked()) 
                    {
                    case MotionEvent.ACTION_DOWN :

                         topy=imageDrop.getTop();
                         leftX=imageDrop.getLeft();
                         rightX=imageDrop.getRight();   
                         bottomY=imageDrop.getBottom();
                        System.err.println("Display Top-->"+topy);      
                        System.err.println("Display Left-->"+leftX);
                        System.err.println("Display Right-->"+rightX);
                        System.err.println("Display Bottom-->"+bottomY);                


                        //opRect.
                        break;
                    case MotionEvent.ACTION_MOVE:
                        crashX=(int) event.getX();
                        crashY=(int) event.getY();
                        System.err.println("Display Here X Value-->"+crashX);
                        System.err.println("Display Here Y Value-->"+crashY);

                        int x = (int) event.getX() - offset_x;
                        int y = (int) event.getY() - offset_y;                                          
                        //int w = getWindowManager().getDefaultDisplay().getWidth() - 100;
                        //int h = getWindowManager().getDefaultDisplay().getHeight() - 100;
                        int w = getWindowManager().getDefaultDisplay().getWidth() - 50;
                        int h = getWindowManager().getDefaultDisplay().getHeight() - 10;
                        if (x > w)
                            x = w;
                        if (y > h)
                            y = h;                      
                        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(new ViewGroup.MarginLayoutParams(  RelativeLayout.LayoutParams.WRAP_CONTENT,   RelativeLayout.LayoutParams.WRAP_CONTENT));
                        lp.setMargins(x, y, 0, 0);                  

                        //Drop Image Here                       
                        if(crashX > leftX && crashX < rightX && crashY > topy && crashY < bottomY )                     
                        {                           
                            Drawable temp=selected_item.getBackground();                            
                            imageDrop.setBackgroundDrawable(temp);
                            imageDrop.bringToFront();                           
                            dropFlag=true;
                            selected_item.setVisibility(View.INVISIBLE);
                        }
                        //Drop Image Here                       
                        selected_item.setLayoutParams(lp);
                        break;  
                    case MotionEvent.ACTION_UP:
                        //                      
                        touchFlag=false;
                        if(dropFlag==true)
                        {
                            dropFlag=false;
                        }
                        else
                        {
                            selected_item.setLayoutParams(imageParams);
                        }                       
                        break;
                    default:
                        break;
                    }
                }else
                {
                    System.err.println("Display Else Part ::->"+touchFlag);
                }               
                return true;
            }
        });

        image1.setOnTouchListener(this);
        image2.setOnTouchListener(this);
    }

    public boolean onTouch(View v, MotionEvent event) 
    {   
        switch (event.getActionMasked()) 
        {
        case MotionEvent.ACTION_DOWN:
            touchFlag=true;
            offset_x = (int) event.getX();
            offset_y = (int) event.getY();
            selected_item = v;
            imageParams=v.getLayoutParams();
            break;
        case MotionEvent.ACTION_UP:
            selected_item=null;
            touchFlag=false;
            break;
        default:
            break;
        }       
        return false;
    }
}

之后创建一个类并像RelativeLayout一样扩展主布局

package info.tempDD;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.RelativeLayout;

public class TouchInterceptor extends RelativeLayout {
    public TouchInterceptor(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {

        return super.onInterceptTouchEvent(ev);
    }

}

主要我的Xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/ImgDrop"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentTop="true"
        android:layout_centerInParent="true"
        android:layout_marginTop="50dp"
        android:background="#FFFFFF" >
    </ImageView>

    <ImageView
        android:id="@+id/img"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:background="@drawable/ic_launcher" >
    </ImageView>

    <ImageView
        android:id="@+id/img2"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:background="@drawable/ic_launcher" >
    </ImageView>

</RelativeLayout>

参考https://stackoverflow.com/a/11431727/2771869