每当拖动时,可拖动按钮就会脱离相对布局 [英] Draggable Button getting out of RelativeLayout whenever dragged
问题描述
我正在开发一个使用 拖放
功能的应用程序.我正在生成按钮 OnClick
.代码工作正常,但是当我 drag
button
到 relativelayout
,按钮脱离layout
.我希望它留在 layout
内.
I am developing an application in which I am using Drag and Drop
functionality.
In that I am generating buttons OnClick
.The code is working fine but when I drag
the button
to the corners of the relativelayout
,button gets out of the layout
. I want it to stay inside of the layout
.
拖动按钮之前
拖动按钮后(在本例中位于上角)
正如您所见,每当我将 按钮
拖动
到 的末端/角落时,它就会脱离
,我希望它原封不动地留在layout
>layoutlayout
中,显示完整的button
.我该怎么做?
As you can see that the button
is getting out of the layout
whenever I drag
it towards the end/corner of the layout
, I want it to stay in the layout
intact, display full button
. How can I do that?
提前致谢!
MainActivity.java
public class MainActivity extends Activity implements OnTouchListener {
Button btnAddButton;
RelativeLayout rl1;
int i = 1;
private int _xDelta;
private int _yDelta;
ViewGroup _root;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnAddButton = (Button) findViewById(R.id.btnAdd);
rl1 = (RelativeLayout) findViewById(R.id.relative_layout);
_root = (ViewGroup)findViewById(R.id.relative_layout);
btnAddButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
add(v);
}
});
}
public void add(View v) {
Button btn = new Button(MainActivity.this);
//btn.setId(i);
RelativeLayout.LayoutParams layoutParam = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
int a=(int) (Math.random()*100);
// Toast.makeText(MainActivity.this, String.valueOf(Math.random()*100), 1).show();//double a=Math.random();
layoutParam.leftMargin = 30+a;
if (i > 1) {
layoutParam.addRule(RelativeLayout.BELOW, (i - 1));
}
btn.setText("Button" + i);
rl1.addView(btn, layoutParam);
btn.setOnTouchListener(this);
i++;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onTouch(View v, 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 lParams = (RelativeLayout.LayoutParams) v.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) v.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = -250;
layoutParams.bottomMargin = -250;
v.setLayoutParams(layoutParams);
break;
}
_root.invalidate();
return true;
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linear_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="AddButton"
android:text="Button" />
<RelativeLayout
android:id="@+id/relative_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/btnAdd" >
</RelativeLayout>
</RelativeLayout>
推荐答案
我能够通过使用这些条件来解决这个问题:
I was able to tackle this by using these conditions:
if ((v.getY() < lay.getY())) {
v.setX(xVal);
v.setY(yVal);
} else if (v.getX() < lay.getX()) {
v.setX(xVal);
v.setY(yVal);
} else if (v.getX() + v.getWidth() > lay.getX() + lay.getWidth()) {
v.setX(xVal);
v.setY(yVal);
} else if (v.getY() + v.getHeight() > lay.getY() + lay.getHeight()) {
v.setX(xVal);
v.setY(yVal);
} else {
for (int i = 0; i <= viewIdList.size() - 1; i++) {
if (v.getId() != viewIdList.get(i).getId()) {
View v3 = viewIdList.get(i);
Rect rect1 = new Rect(v.getLeft(), v.getTop(),
v.getRight(), v.getBottom());
v.getHitRect(rect1);
Rect rect2 = new Rect(v3.getLeft(), v3.getTop(),
v3.getRight(), v3.getBottom());
v3.getHitRect(rect2);
if (Rect.intersects(rect1, rect2)) {
System.out.println("overlap");
v.setX(xVal);
v.setY(yVal);
}
其中 v 是视图(在我的例子中是 ImageView),这段代码是用 onTouchListener 的 MotionEvent.ACTION_UP 编写的.
where v is the view (ImageView in my case) and this code is written in MotionEvent.ACTION_UP of onTouchListener.
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