我对java和android编程的知识非常有限(不是来自编程背景)。所以如果可能的话请用外行术语解释一下。基本上，我正在尝试制作一个可以随心所欲移动的麻将牌。我想解决以下问题:
我已经通过 XML 设置了按钮(位于屏幕底部)的初始布局。拖动按钮时，按钮将跳到屏幕顶部。我尝试使用 .getX() 而不是 .getRawX()，但按钮会以困惑的模式移动。而且模拟器速度很慢。
如何为我创建的每个按钮设置边界？就像我不想让按钮在我拖动其中一个按钮时彼此重叠。因此，这意味着如果我将图 block A 移动到图 block B 上，图 block B 将尝试通过移开来避免重叠(或者更好的主意，请参见第 3 条)。
需要大致了解如何使按钮在足够靠近时彼此对齐。意味着当我将图 block A 移近图 block B 时，图 block A 将与图 block B 并排排列。我不希望它们连接在一起(只是对齐)，并且只需将任何图 block 移开即可轻松破坏它们。
这是拖放的代码，我引用了这个论坛的某人:
@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;
}
最佳答案
android 2.2 中的拖放
这里我给出了我的代码，它可以让你成功。我的主类在这里
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;
}
}
此后创建一个类并扩展您的主布局，如relativelayout
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);
}
}
以及主我的 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>
关于java - 拖放到相对布局中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23804111/