public class MyActivity extends Activity implements View.OnTouchListener {
TextView _view;
ViewGroup _root;
private int _xDelta;
private int _yDelta;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
_root = (ViewGroup)findViewById(R.id.root);
_view = new TextView(this);
_view.setText("TextView!!!!!!!!");
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(150, 50);
layoutParams.leftMargin = 50;
layoutParams.topMargin = 50;
layoutParams.bottomMargin = -250;
layoutParams.rightMargin = -250;
_view.setLayoutParams(layoutParams);
_view.setOnTouchListener(this);
_root.addView(_view);
}
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 lParams = (RelativeLayout.LayoutParams) view.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) view.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = -250;
layoutParams.bottomMargin = -250;
view.setLayoutParams(layoutParams);
break;
}
_root.invalidate();
return true;
}}
我已经为移动edittext和imageview做了这个代码。它移动得很好但它也移动到相对布局之外。我必须限制只在特定布局中移动。有人有建议吗？ < / p>
答案 0 :(得分：1)
查看Drag＆amp;删除功能代码我已经实现了：
<强> DragAndDrop.java
public class DragAndDrop extends Activity
{
private ImageView m_ivImage, m_ivImage1;
private int m_counter = 0;
float m_lastTouchX, m_lastTouchY, m_posX, m_posY, m_prevX, m_prevY, m_imgXB, m_imgYB, m_imgXC, m_imgYC, m_dx, m_dy;
private LinearLayout m_llTop;
private AbsoluteLayout m_alTop;
private Button m_btnAddView, m_btnRemove;
private Context m_context;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
m_context = this;
m_prevX = 0;
m_prevY = 0;
m_imgXB = 50;
m_imgYB = 100;
m_imgXC = 150;
m_imgYC = 100;
m_ivImage = (ImageView) findViewById(R.id.ivImage);
m_ivImage1 = (ImageView) findViewById(R.id.ivImage1);
m_llTop = (LinearLayout) findViewById(R.id.llTop);
m_alTop = (AbsoluteLayout) findViewById(R.id.alTop);
m_btnAddView = (Button) findViewById(R.id.btnAdd);
m_btnRemove = (Button) findViewById(R.id.btnRemove);
m_ivImage.setOnTouchListener(m_onTouchListener);
m_ivImage1.setOnTouchListener(m_onTouchListener);
m_btnAddView.setOnClickListener(m_onClickListener);
m_btnRemove.setOnClickListener(m_onClickListener);
}
/**
* Common click listener for clickable controls
*/
OnClickListener m_onClickListener = new OnClickListener(){
@Override
public void onClick(View p_v)
{
switch (p_v.getId())
{
case R.id.btnAdd:
addView();
break;
case R.id.btnRemove:
removeView();
break;
default:
break;
}
}
};
/**
* Touch listener for view
*/
OnTouchListener m_onTouchListener = new OnTouchListener(){
@Override
public boolean onTouch(View p_v, MotionEvent p_event)
{
switch (p_event.getAction())
{
case MotionEvent.ACTION_DOWN:
{
m_lastTouchX = p_event.getX();
m_lastTouchY = p_event.getY();
break;
}
case MotionEvent.ACTION_UP:
{
break;
}
case MotionEvent.ACTION_MOVE:
{
m_dx = p_event.getX() - m_lastTouchX;
m_dy = p_event.getY() - m_lastTouchY;
m_posX = m_prevX + m_dx;
m_posY = m_prevY + m_dy;
if (m_posX > 0 && m_posY > 0 && (m_posX + p_v.getWidth()) < m_alTop.getWidth() && (m_posY + p_v.getHeight()) < m_alTop.getHeight())
{
p_v.setLayoutParams(new AbsoluteLayout.LayoutParams(p_v.getMeasuredWidth(), p_v.getMeasuredHeight(), (int) m_posX, (int) m_posY));
m_prevX = m_posX;
m_prevY = m_posY;
}
break;
}
}
return true;
}
};
/**
* Add view dynamically for drag and drop
*/
private void addView()
{
ImageView m_img = new ImageView(m_context);
if (m_counter < 5)
{
m_img.setBackgroundResource(R.drawable.ic_launcher);
m_alTop.addView(m_tv, new LayoutParams(android.view.ViewGroup.LayoutParams.WRAP_CONTENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, ((int) m_imgXB), ((int) m_imgYB)));
m_alTop.addView(m_img, new LayoutParams(android.view.ViewGroup.LayoutParams.WRAP_CONTENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, ((int) m_imgXB), ((int) m_imgYB)));
m_counter++;
if (m_counter == 5)
m_btnAddView.setEnabled(false);
}
m_img.setOnTouchListener(m_onTouchListener);
m_tv.setOnTouchListener(m_onTouchListener);
}
public void removeView()
{
m_counter = 0;
m_alTop.removeAllViews();
m_alTop.invalidate();
m_btnAddView.setEnabled(true);
}
布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/llTop"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<AbsoluteLayout
android:id="@+id/alTop"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_margin="10dp"
android:layout_weight=".70"
>
<ImageView
android:id="@+id/ivImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:src="@drawable/ic_menu_share"
android:visibility="gone" />
<ImageView
android:id="@+id/ivImage1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_x="193dp"
android:layout_y="29dp"
android:src="@drawable/ic_launcher" />
</AbsoluteLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_gravity="center"
android:layout_weight=".30" >
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/addview" />
<Button
android:id="@+id/btnRemove"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/removeview"
android:visibility="visible" />
</LinearLayout>
</LinearLayout>