我正在尝试创建一个用户可以移动输入的表单。我有一个editText，希望它能够将它移动到我的relativeLayout中的新位置。我能够把它拿起并移动它，但是一旦我放手，它就完全消失了。我已经尝试了很多东西。我认为可能永远不会调用onDrag方法，因为我的日志永远不会出现。另外，在放弃我的editText后，我在logcat中收到此错误消息：Reporting drop result: false
我遇到的另一个问题是，当你点击editText时，我认为我试图拖动它意味着我实际上无法更改其中的文字。
任何帮助表示赞赏！谢谢！
这是我的相对布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
xmlns:app = "http://schemas.android.com/apk/res-auto"
xmlns:tools = "http://schemas.android.com/tools"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
android:paddingBottom = "@dimen/activity_vertical_margin"
android:paddingLeft = "@dimen/activity_horizontal_margin"
android:paddingRight = "@dimen/activity_horizontal_margin"
android:paddingTop = "@dimen/activity_vertical_margin"
app:layout_behavior = "@string/appbar_scrolling_view_behavior"
tools:context = "com.supercilex.myapp.NewForm"
tools:showIn = "@layout/activity_new_form"
android:id="@+id/relativeLayout">
<EditText
android:id = "@+id/editText"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_alignParentStart = "true"
android:layout_alignParentTop = "true"
android:ems = "10"
android:hint = "Enter some text"
android:inputType = "textPersonName" />
</RelativeLayout>
这是我的班级：
import android.content.ClipData;
import android.content.ClipDescription;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.DragEvent;
import android.view.MotionEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.RelativeLayout;
import common.FileManagement;
public class NewForm extends AppCompatActivity
{
private static EditText editText;
private android.widget.RelativeLayout.LayoutParams layoutParams;
String msg;
@Override
protected void onCreate ( Bundle savedInstanceState )
{
super.onCreate ( savedInstanceState );
setContentView ( R.layout.activity_new_form );
Toolbar toolbar = ( Toolbar ) findViewById ( R.id.toolbar );
setSupportActionBar ( toolbar );
editText = ( EditText ) findViewById ( R.id.editText );
FileManagement fileManagement = new FileManagement ();
editText.setText ( fileManagement.read ( "textViewData", getApplicationContext () ) );
FloatingActionButton fab = ( FloatingActionButton ) findViewById ( R.id.fab );
fab.setOnClickListener ( new View.OnClickListener ()
{
@Override
public void onClick ( View view )
{
FileManagement fileManagement = new FileManagement ();
String tmpEditText = editText.getText ().toString ();
MainActivity.textView.setText ( tmpEditText );
fileManagement.save ( "textViewData", tmpEditText, getApplicationContext () );
finish ();
}
} );
editText.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
ClipData.Item item = new ClipData.Item((CharSequence)v.getTag());
String[] mimeTypes = { ClipDescription.MIMETYPE_TEXT_PLAIN};
ClipData dragData = new ClipData(v.getTag().toString(),mimeTypes, item);
View.DragShadowBuilder myShadow = new View.DragShadowBuilder(editText);
v.startDrag(dragData,myShadow,null,0);
return true;
}
});
editText.setOnDragListener(new View.OnDragListener() {
@Override
public boolean onDrag(View v, DragEvent event) {
switch(event.getAction())
{
case DragEvent.ACTION_DRAG_STARTED:
layoutParams = (RelativeLayout.LayoutParams)v.getLayoutParams();
Log.d(msg, "Action is DragEvent.ACTION_DRAG_STARTED");
return true;
case DragEvent.ACTION_DRAG_ENTERED:
Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENTERED");
int x_cord = (int) event.getX();
int y_cord = (int) event.getY();
return true;
case DragEvent.ACTION_DRAG_EXITED :
Log.d(msg, "Action is DragEvent.ACTION_DRAG_EXITED");
x_cord = (int) event.getX();
y_cord = (int) event.getY();
layoutParams.leftMargin = x_cord;
layoutParams.topMargin = y_cord;
v.setLayoutParams(layoutParams);
return true;
case DragEvent.ACTION_DRAG_LOCATION :
Log.d(msg, "Action is DragEvent.ACTION_DRAG_LOCATION");
x_cord = (int) event.getX();
y_cord = (int) event.getY();
return true;
case DragEvent.ACTION_DRAG_ENDED :
Log.d ( msg, "Action is DragEvent.ACTION_DRAG_ENDED" );
return true;
case DragEvent.ACTION_DROP:
Log.d( msg, "ACTION_DROP event");
return true;
default:
break;
}
return true;
}
});
editText.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
ClipData data = ClipData.newPlainText("", "");
View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(editText);
editText.startDrag(data, shadowBuilder, editText, 0);
editText.setVisibility(View.INVISIBLE);
return true;
}
else
{
return false;
}
}
});
}
}
我还尝试使用break;代替return true;的onDrag方法
我已经这样试过了：
public boolean onDrag(View v, DragEvent event) {
switch(event.getAction())
{
case DragEvent.ACTION_DRAG_STARTED:
break;
case DragEvent.ACTION_DRAG_ENTERED:
break;
case DragEvent.ACTION_DRAG_EXITED :
break;
case DragEvent.ACTION_DRAG_LOCATION :
break;
case DragEvent.ACTION_DRAG_ENDED :
break;
case DragEvent.ACTION_DROP:
View view = (View) event.getLocalState();
ViewGroup owner = (ViewGroup) view.getParent();
owner.removeView(view);
FrameLayout container = (FrameLayout) v;
container.addView(view);
view.setVisibility(View.VISIBLE);
Log.d( msg, "ACTION_DROP event");
break;
default:
break;
}
return true;
}
修改 这是我更新的代码：
高于onCreate()
private EditText editText;
private RelativeLayout.LayoutParams layoutParams;
其余的：
findViewById(R.id.yourlayoutname).setOnDragListener( new View.OnDragListener()
{
@Override
public boolean onDrag ( View v, DragEvent event )
{
if ( event.getAction() == DragEvent.ACTION_DROP )
{
int xCord = ( int ) event.getX();
int yCord = ( int ) event.getY();
int height = editText.getHeight();
int width = editText.getWidth();
layoutParams.leftMargin = xCord - width;
layoutParams.topMargin = yCord - height;
editText.setLayoutParams( layoutParams );
}
return true;
}
});
editText.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
String[] mimeTypes = { ClipDescription.MIMETYPE_TEXT_PLAIN};
ClipData data = ClipData.newPlainText("", "");
View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(editText);
v.startDrag( data, shadowBuilder, mimeTypes, 0);
return true;
}
} );
editText.setOnDragListener( new View.OnDragListener()
{
@Override
public boolean onDrag ( View v, DragEvent event )
{
if ( event.getAction() == DragEvent.ACTION_DRAG_STARTED )
{
layoutParams = ( RelativeLayout.LayoutParams ) v.getLayoutParams();
}
return true;
}
} );
答案 0 :(得分：1)
I get this error message in logcat: Reporting drop result: false
这不是错误消息。这意味着true View的行动结果未返回DragListener。
您的EditText消失了，因为您将View.INVISIBLE内的onTouchListener设置为editText.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
ClipData data = ClipData.newPlainText("", "");
View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(editText);
editText.startDrag(data, shadowBuilder, editText, 0);
editText.setVisibility(View.INVISIBLE);
return true;
}
else
{
return false;
}
}
});
并且从未更改过。
试试这个： 首先选择是否要通过触摸或长按拖动。你不需要两者兼而有之。让我们说你决定通过触摸来做到这一点：
EditText从代码侦听器中删除所有reduntant代码，不需要它来拖动，因为系统会为您处理拖动。如果您希望Drop的协调成为DragListener的新位置，则需要将EditText分配给RelativeLayout容器 editText.setOnDragListener(new View.OnDragListener() {
@Override
public boolean onDrag(View v, DragEvent event) {
if (event.getAction == DragEvent.ACTION_DRAG_STARTED){
layoutParams = (RelativeLayout.LayoutParams)v.getLayoutParams();
} else if (event.getAction() == DragEvent.ACTION_DRAG_ENDED)
v.setVisibility(View.VISIBLE)
return true;
}
});
，并在`ACTION_DROP中检索它们。如果不是：
findViewById(R.id.relativeLayout).setOnDragListener(new View.OnDragListener() {
@Override
public boolean onDrag(View v, DragEvent event) {
if (event.getAction() == DragEvent.ACTION_DRAG_DROP){
int x_cord = (int) event.getX();
int y_cord = (int) event.getY();
layoutParams.leftMargin = x_cord;
layoutParams.topMargin = y_cord;
editText.setLayoutParams(layoutParams);
}
return true;
}
});
要获得放置位置，您需要类似的东西：
Xcode