标签:java android android-layout imageview drag-and-drop
我想在另一个ImageView或Layout中完成一个简单的ImageView拖放操作.这是我想要做的事情的图片
我知道这样做的唯一方法是通过2个线性布局,一个“FROM”和“TO”,并为第二个布局指定灰色字母的背景图像.
这是我的代码
public class MainActivity extends Activity implements OnTouchListener,
OnDragListener {
private static final String LOGCAT = null;
/*
* Here are the links I've been using
* http://www.techrepublic.com/blog/software-engineer/try-androids-useful-drag-and-drop-api/
* http://codingjunkie.net/android-drag-and-drop-part-2/
* http://javapapers.com/android/android-drag-and-drop/
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.letter_a).setOnTouchListener(this); // My yellow letter a image
findViewById(R.id.top_container).setOnDragListener(this); // My 1st linear layout
findViewById(R.id.bottom_container).setOnDragListener(this); // My 2nd linear layout with "grayed a" image
}
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
view.startDrag(null, shadowBuilder, view, 0);
view.setVisibility(View.INVISIBLE);
return true;
} else {
return false;
}
}
@Override
public boolean onDrag(View layoutview, DragEvent dragevent) {
int action = dragevent.getAction();
View view = (View) dragevent.getLocalState();
switch (action) {
case DragEvent.ACTION_DRAG_STARTED:
break;
case DragEvent.ACTION_DRAG_ENTERED:
break;
case DragEvent.ACTION_DRAG_EXITED:
break;
case DragEvent.ACTION_DROP:
ViewGroup owner = (ViewGroup) view.getParent();
owner.removeView(view);
LinearLayout container = (LinearLayout) layoutview;
container.addView(view);
view.setVisibility(View.VISIBLE);
break;
case DragEvent.ACTION_DRAG_ENDED:
Log.d(LOGCAT, "Drag ended");
if (dropEventNotHandled(dragevent)){
view.setVisibility(View.VISIBLE);
}
break;
default:
break;
}
return true;
}
private boolean dropEventNotHandled(DragEvent dragEvent) {
return !dragEvent.getResult();
}
}
我已经设法让onTouch和onDrag工作并检测移动时,但我想把它锁定到位,这样它就不能被拖回原来的地方了.
十分感谢!
解决方法:
如果它应该保留在bottom_container中,只需取消注册侦听器,如果它已被丢弃,例如像这样:
case DragEvent.ACTION_DROP:
ViewGroup owner = (ViewGroup) view.getParent();
owner.removeView(view);
LinearLayout container = (LinearLayout) layoutview;
container.addView(view);
view.setVisibility(View.VISIBLE);
if(container.getId()==R.id.bottom_container){
view.setOnTouchListener(null);
owner.setOnDragListener(null);
}
break;
标签:java,android,android-layout,imageview,drag-and-drop 来源: https://codeday.me/bug/20190703/1366182.html
本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享; 2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关; 3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关; 4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除; 5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。