问题
public class Quiz extends Activity {
int windowwidth;
int windowheight;
ImageView ima ima2;
private View selected_item = null;
private int offset_x = 0;
private int offset_y = 0;
private android.widget.LinearLayout.LayoutParams layoutParams1,
layoutParams2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.quiz);
windowwidth = getWindowManager().getDefaultDisplay().getWidth();
windowheight = getWindowManager().getDefaultDisplay().getHeight();
System.out.println("width" + windowwidth);
System.out.println("height" + windowheight);
//on touch listener for image view
ima1 = (ImageView) findViewById(R.id.shuffledimage);
ima1.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
layoutParams1 = (LinearLayout.LayoutParams) ima1
.getLayoutParams();
try {//action performed in image view
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
int x_cord = (int) event.getRawX();
int y_cord = (int) event.getRawY();
if (x_cord > windowwidth) {
x_cord = windowwidth;
}
if (y_cord > windowheight) {
y_cord = windowheight;
}
layoutParams1.leftMargin = x_cord - 25;
layoutParams1.topMargin = y_cord - 75;
ima1.setLayoutParams(layoutParams1);
break;
default:
break;
}
} catch (Exception e) {
// TODO: handle exception
e.getMessage();
}
return true;
}
});
ima2 = (ImageView) findViewById(R.id.userimage);
ima2.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
layoutParams2 = (LinearLayout.LayoutParams) ima2
.getLayoutParams();
try {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
int x_cord = (int) event.getRawX();
int y_cord = (int) event.getRawY();
if (x_cord > windowwidth) {
x_cord = windowwidth;
}
if (y_cord > windowheight) {
y_cord = windowheight;
}
layoutParams2.leftMargin = x_cord - 25;
layoutParams2.topMargin = y_cord - 75;
ima2.setLayoutParams(layoutParams2);
break;
default:
break;
}
} catch (Exception e) {
e.getMessage();
}
return true;
}
});
}
}
//xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/ipodbackground"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@drawable/headingmain1"
android:gravity="center_horizontal" >
<Button
android:id="@+id/button1"
android:layout_width="65dp"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:background="#00000000" />
<Button
android:id="@+id/button2"
android:layout_width="40dp"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#00000000" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="@drawable/quiztitle1" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp" >
<LinearLayout
android:id="@+id/l1"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_marginRight="25dp"
android:background="@drawable/box"
android:orientation="horizontal" >
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:text="TextView" />
<ImageView
android:id="@+id/userimage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="160dp"
android:layout_weight="1"
android:background="#FFFFFF"
android:src="@drawable/ic_launcher" />
</LinearLayout>
<LinearLayout
android:layout_width="100dp"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_marginRight="5dp"
android:layout_toRightOf="@+id/l1" >
<ImageView
android:id="@+id/shuffledimage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:src="@drawable/iconsearch" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
// i want to drag and drop image from one image view to another imageview and in above code section image can be dragged correctly when i drag but the image cant dropped to the source image view. anybody please give solution
回答1:
For drag and drop please go through the following links .
http://blahti.wordpress.com/2011/10/03/drag-drop-for-android-gridview/
http://www.twylah.com/dodulz/tweets/169426982533206016
回答2:
You can achieve it in followin way
package edu.sbcc.cs123.draganddropbasic;
import android.app.*;
import android.graphics.*;
import android.os.*;
import android.view.*;
import android.view.View.*;
import android.widget.*;
@SuppressWarnings("deprecation")
public class DragAndDropBasicActivity extends Activity implements OnTouchListener {
private ImageView letterView; // The letter that the user drags.
private ImageView emptyLetterView; // The letter outline that the user is supposed to drag letterView to.
private AbsoluteLayout mainLayout;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mainLayout = (AbsoluteLayout) findViewById(R.id.mainLayout);
mainLayout.setOnTouchListener(this);
letterView = (ImageView) findViewById(R.id.letterView);
letterView.setOnTouchListener(this);
emptyLetterView = (ImageView) findViewById(R.id.emptyLetterView);
}
private boolean dragging = false;
private Rect hitRect = new Rect();
@Override
/**
* NOTE: Had significant problems when I tried to react to ACTION_MOVE on letterView. Kept getting alternating (X,Y)
* locations of the motion events, which caused the letter to flicker and move back and forth. The only solution I could
* find was to determine when the user had touched down on the letter, then process moves in the ACTION_MOVE
* associated with the mainLayout.
*/
public boolean onTouch(View v, MotionEvent event) {
boolean eventConsumed = true;
int x = (int)event.getX();
int y = (int)event.getY();
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
if (v == letterView) {
letterView.setImageResource(R.drawable.carkey1);
dragging = true;
eventConsumed = false;
}
} else if (action == MotionEvent.ACTION_UP) {
if (dragging) {
emptyLetterView.getHitRect(hitRect);
if (hitRect.contains(x, y)) {
letterView.setImageResource(R.drawable.carkey3);
setSameAbsoluteLocation(letterView, emptyLetterView);
}
}
dragging = false;
eventConsumed = false;
} else if (action == MotionEvent.ACTION_MOVE) {
if (v != letterView) {
if (dragging) {
setAbsoluteLocationCentered(letterView, x, y);
}
}
}
return eventConsumed;
}
private void setSameAbsoluteLocation(View v1, View v2) {
AbsoluteLayout.LayoutParams alp2 = (AbsoluteLayout.LayoutParams) v2.getLayoutParams();
setAbsoluteLocation(v1, alp2.x, alp2.y);
}
private void setAbsoluteLocationCentered(View v, int x, int y) {
setAbsoluteLocation(v, x - v.getWidth() / 2, y - v.getHeight() / 2);
}
private void setAbsoluteLocation(View v, int x, int y) {
AbsoluteLayout.LayoutParams alp = (AbsoluteLayout.LayoutParams) v.getLayoutParams();
alp.x = x;
alp.y = y;
v.setLayoutParams(alp);
}
}
xml
----
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="@+id/emptyLetterView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/carkey2" >
</ImageView>
<ImageView
android:id="@+id/letterView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="200dp"
android:layout_y="450dp"
android:src="@drawable/carkey1" >
</ImageView>
</AbsoluteLayout>
来源：https://stackoverflow.com/questions/13247050/how-to-drag-images-from-one-imageview-and-drop-to-another-image-view