在发布这个问题之前，我已经搜索了很多，但找不到关于这个问题的任何明确答案。
我必须覆盖 android webview 的默认文本选择并显示我的自定义文本选择对话框选项。我试过这个示例代码 project .
此示例项目适用于以下设备和模拟器:
不适用于以下设备:
在 android os 版本 4.1 和 4.1+ 上，它不显示我的自定义文本选择选项对话框，而是显示 android 系统的默认文本选择操作栏。
我对此进行了很多搜索，许多人建议使用 interface 的 onLongClick() 方法
我已经在这个论坛上问过一个问题，请看这个link ，有了这个问题的答案，我可以克隆 onLongClick() 事件，但我无法停止默认的文本选择操作栏。
对于这种情况，我有几个问题。
1.为什么onLongClick()方法在android os 4.1+版本的设备上停止工作？
2.如何在webview中长按文本时停止默认文本选择操作栏？
这是我的自定义 webview 类。
package com.epubreader.ebook;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.graphics.Region;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.ContextMenu;
import android.view.Display;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.webkit.WebView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.epubreader.R;
import com.epubreader.drag.DragController;
import com.epubreader.drag.DragLayer;
import com.epubreader.drag.DragListener;
import com.epubreader.drag.DragSource;
import com.epubreader.drag.MyAbsoluteLayout;
import com.epubreader.menu.menuAnimationHelper;
import com.epubreader.textselection.WebTextSelectionJSInterface;
import com.epubreader.textselectionoverlay.ActionItem;
import com.epubreader.textselectionoverlay.QuickAction;
import com.epubreader.textselectionoverlay.QuickAction.OnDismissListener;
public class CustomWebView extends WebView implements WebTextSelectionJSInterface,
OnTouchListener , OnLongClickListener, OnDismissListener, DragListener{
/** The logging tag. */
private static final String TAG = "CustomWebView";
/** Context. */
protected Context ctx;
/** The context menu. */
private QuickAction mContextMenu;
/** The drag layer for selection. */
private DragLayer mSelectionDragLayer;
/** The drag controller for selection. */
private DragController mDragController;
/** The start selection handle. */
private ImageView mStartSelectionHandle;
/** the end selection handle. */
private ImageView mEndSelectionHandle;
/** The selection bounds. */
private Rect mSelectionBounds = null;
/** The previously selected region. */
protected Region lastSelectedRegion = null;
/** The selected range. */
protected String selectedRange = "";
/** The selected text. */
protected String selectedText = "";
/** Javascript interface for catching text selection. */
/** Selection mode flag. */
protected boolean inSelectionMode = false;
/** Flag to stop from showing context menu twice. */
protected boolean contextMenuVisible = false;
/** The current content width. */
protected int contentWidth = 0;
/** Identifier for the selection start handle. */
private final int SELECTION_START_HANDLE = 0;
/** Identifier for the selection end handle. */
private final int SELECTION_END_HANDLE = 1;
/** Last touched selection handle. */
private int mLastTouchedSelectionHandle = -1;
/** Variables for Left & Right Menu ***/
private View menuView;
private LinearLayout toiLay;
private menuAnimationHelper _menuAnimationHelper;
private TocTranslateAnimation _tocTranslateAnimation;
private CustomWebView _customWebView;
public CustomWebView(Context context) {
super(context);
this.ctx = context;
this.setup(context);
}
public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.ctx = context;
this.setup(context);
}
public CustomWebView(Context context, AttributeSet attrs) {
super(context, attrs);
this.ctx = context;
this.setup(context);
}
//*****************************************************
//*
//* Touch Listeners
//*
//*****************************************************
private boolean mScrolling = false;
private float mScrollDiffY = 0;
private float mLastTouchY = 0;
private float mScrollDiffX = 0;
private float mLastTouchX = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
float xPoint = getDensityIndependentValue(event.getX(), ctx) / getDensityIndependentValue(this.getScale(), ctx);
float yPoint = getDensityIndependentValue(event.getY(), ctx) / getDensityIndependentValue(this.getScale(), ctx);
// TODO: Need to update this to use this.getScale() as a factor.
//Log.d(TAG, "onTouch " + xPoint + " , " + yPoint);
closeMenu();
if(event.getAction() == MotionEvent.ACTION_DOWN){
final String startTouchUrl = String.format("javascript:android.selection.startTouch(%f, %f);",
xPoint, yPoint);
mLastTouchX = xPoint;
mLastTouchY = yPoint;
((Activity)this.ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl(startTouchUrl);
}
});
// This two line clones the onLongClick()
longClickHandler.removeCallbacks(longClickRunnable);
longClickHandler.postDelayed(longClickRunnable,300);
}
else if(event.getAction() == MotionEvent.ACTION_UP){
// Check for scrolling flag
if(!mScrolling){
this.endSelectionMode();
}
// This line clones the onLongClick()
longClickHandler.removeCallbacks(longClickRunnable);
mScrollDiffX = 0;
mScrollDiffY = 0;
mScrolling = false;
}else if(event.getAction() == MotionEvent.ACTION_MOVE){
mScrollDiffX += (xPoint - mLastTouchX);
mScrollDiffY += (yPoint - mLastTouchY);
mLastTouchX = xPoint;
mLastTouchY = yPoint;
// Only account for legitimate movement.
if(Math.abs(mScrollDiffX) > 10 || Math.abs(mScrollDiffY) > 10){
mScrolling = true;
}
// This line clones the onLongClick()
longClickHandler.removeCallbacks(longClickRunnable);
}
// If this is in selection mode, then nothing else should handle this touch
return false;
}
/**
* Pass References of Left & Right Menu
*/
public void initMenu(LinearLayout _toiLay,View _menuView,menuAnimationHelper menuAnimationHelper,
TocTranslateAnimation tocTranslateAnimation){
toiLay = _toiLay;
menuView = _menuView;
_menuAnimationHelper = menuAnimationHelper;
_tocTranslateAnimation = tocTranslateAnimation;
}
private void closeMenu(){
if(_menuAnimationHelper != null && _menuAnimationHelper.isMenuOpenBool){
_menuAnimationHelper.close(menuView);
_menuAnimationHelper.isMenuOpenBool = false;
}
if(_tocTranslateAnimation != null && _tocTranslateAnimation.isTocListOpenBool){
_tocTranslateAnimation.close(toiLay);
_tocTranslateAnimation.isTocListOpenBool = false;
}
}
public void removeOverlay(){
Log.d("JsHandler", "in java removeOverlay" + mScrolling);
this.endSelectionMode();
mScrollDiffX = 0;
mScrollDiffY = 0;
mScrolling = false;
}
@Override
public boolean onLongClick(View v){
Log.d(TAG, "from webView onLongClick ");
mScrolling = true;
((Activity)this.ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl("javascript:android.selection.longTouch()");
}
});
Toast.makeText(ctx, "Long click is clicked ", Toast.LENGTH_LONG).show();
// Don't let the webview handle it
return true;
}
//*****************************************************
//*
//* Setup
//*
//*****************************************************
ContextMenu.ContextMenuInfo contextMenuInfo;
/**
* Setups up the web view.
* @param context
*/
protected void setup(Context context){
// On Touch Listener
this.setOnTouchListener(this);
this.setClickable(false);
this.setLongClickable(true);
this.setOnLongClickListener(this);
contextMenuInfo = this.getContextMenuInfo();
// Webview setup
this.getSettings().setJavaScriptEnabled(true);
this.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
// Create the selection handles
createSelectionLayer(context);
// Set to the empty region
Region region = new Region();
region.setEmpty();
_customWebView = this;
this.lastSelectedRegion = region;
}
/**
* To clone OnLongClick Listener because its not responding for version 4.1
*/
public Runnable longClickRunnable = new Runnable() {
public void run() {
longClickHandler.sendEmptyMessage(0);
}
};
public Handler longClickHandler = new Handler(){
public void handleMessage(Message m){
_customWebView.loadUrl("javascript:android.selection.longTouch();");
mScrolling = true;
}
};
public WebTextSelectionJSInterface getTextSelectionJsInterface(){
return this;
}
//*****************************************************
//*
//* Selection Layer Handling
//*
//*****************************************************
/**
* Creates the selection layer.
*
* @param context
*/
protected void createSelectionLayer(Context context){
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.mSelectionDragLayer = (DragLayer) inflater.inflate(R.layout.selection_drag_layer, null);
// Make sure it's filling parent
this.mDragController = new DragController(context);
this.mDragController.setDragListener(this);
this.mDragController.addDropTarget(mSelectionDragLayer);
this.mSelectionDragLayer.setDragController(mDragController);
this.mStartSelectionHandle = (ImageView) this.mSelectionDragLayer.findViewById(R.id.startHandle);
this.mStartSelectionHandle.setTag(new Integer(SELECTION_START_HANDLE));
this.mEndSelectionHandle = (ImageView) this.mSelectionDragLayer.findViewById(R.id.endHandle);
this.mEndSelectionHandle.setTag(new Integer(SELECTION_END_HANDLE));
OnTouchListener handleTouchListener = new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
boolean handledHere = false;
final int action = event.getAction();
// Down event starts drag for handle.
if (action == MotionEvent.ACTION_DOWN) {
handledHere = startDrag (v);
mLastTouchedSelectionHandle = (Integer) v.getTag();
}
return handledHere;
}
};
this.mStartSelectionHandle.setOnTouchListener(handleTouchListener);
this.mEndSelectionHandle.setOnTouchListener(handleTouchListener);
}
/**
* Starts selection mode on the UI thread
*/
private Handler startSelectionModeHandler = new Handler(){
public void handleMessage(Message m){
if(mSelectionBounds == null)
return;
addView(mSelectionDragLayer);
drawSelectionHandles();
int contentHeight = (int) Math.ceil(getDensityDependentValue(getContentHeight(), ctx));
// Update Layout Params
ViewGroup.LayoutParams layerParams = mSelectionDragLayer.getLayoutParams();
layerParams.height = contentHeight;
layerParams.width = contentWidth;
mSelectionDragLayer.setLayoutParams(layerParams);
}
};
/**
* Starts selection mode.
*
* @param selectionBounds
*/
public void startSelectionMode(){
this.startSelectionModeHandler.sendEmptyMessage(0);
}
// Ends selection mode on the UI thread
private Handler endSelectionModeHandler = new Handler(){
public void handleMessage(Message m){
//Log.d("TableContentsWithDisplay", "in endSelectionModeHandler");
removeView(mSelectionDragLayer);
if(getParent() != null && mContextMenu != null && contextMenuVisible){
// This will throw an error if the webview is being redrawn.
// No error handling needed, just need to stop the crash.
try{
mContextMenu.dismiss();
}
catch(Exception e){
}
}
mSelectionBounds = null;
mLastTouchedSelectionHandle = -1;
try {
((Activity)ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl("javascript: android.selection.clearSelection();");
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
};
/**
* Ends selection mode.
*/
public void endSelectionMode(){
this.endSelectionModeHandler.sendEmptyMessage(0);
}
/**
* Calls the handler for drawing the selection handles.
*/
private void drawSelectionHandles(){
this.drawSelectionHandlesHandler.sendEmptyMessage(0);
}
/**
* Handler for drawing the selection handles on the UI thread.
*/
private Handler drawSelectionHandlesHandler = new Handler(){
public void handleMessage(Message m){
MyAbsoluteLayout.LayoutParams startParams = (com.epubreader.drag.MyAbsoluteLayout.LayoutParams) mStartSelectionHandle.getLayoutParams();
startParams.x = (int) (mSelectionBounds.left - mStartSelectionHandle.getDrawable().getIntrinsicWidth());
startParams.y = (int) (mSelectionBounds.top - mStartSelectionHandle.getDrawable().getIntrinsicHeight());
// Stay on screen.
startParams.x = (startParams.x < 0) ? 0 : startParams.x;
startParams.y = (startParams.y < 0) ? 0 : startParams.y;
mStartSelectionHandle.setLayoutParams(startParams);
MyAbsoluteLayout.LayoutParams endParams = (com.epubreader.drag.MyAbsoluteLayout.LayoutParams) mEndSelectionHandle.getLayoutParams();
endParams.x = (int) mSelectionBounds.right;
endParams.y = (int) mSelectionBounds.bottom;
endParams.x = (endParams.x < 0) ? 0 : endParams.x;
endParams.y = (endParams.y < 0) ? 0 : endParams.y;
mEndSelectionHandle.setLayoutParams(endParams);
}
};
/**
* Checks to see if this view is in selection mode.
* @return
*/
public boolean isInSelectionMode(){
return this.mSelectionDragLayer.getParent() != null;
}
//*****************************************************
//*
//* DragListener Methods
//*
//*****************************************************
/**
* Start dragging a view.
*
*/
private boolean startDrag (View v)
{
// Let the DragController initiate a drag-drop sequence.
// I use the dragInfo to pass along the object being dragged.
// I'm not sure how the Launcher designers do this.
Object dragInfo = v;
mDragController.startDrag (v, mSelectionDragLayer, dragInfo, DragController.DRAG_ACTION_MOVE);
return true;
}
@Override
public void onDragStart(DragSource source, Object info, int dragAction) {
// TODO Auto-generated method stub
}
@Override@SuppressWarnings("deprecation")
public void onDragEnd() {
// TODO Auto-generated method stub
MyAbsoluteLayout.LayoutParams startHandleParams = (MyAbsoluteLayout.LayoutParams) this.mStartSelectionHandle.getLayoutParams();
MyAbsoluteLayout.LayoutParams endHandleParams = (MyAbsoluteLayout.LayoutParams) this.mEndSelectionHandle.getLayoutParams();
float scale = getDensityIndependentValue(this.getScale(), ctx);
float startX = startHandleParams.x - this.getScrollX();
float startY = startHandleParams.y - this.getScrollY();
float endX = endHandleParams.x - this.getScrollX();
float endY = endHandleParams.y - this.getScrollY();
startX = getDensityIndependentValue(startX, ctx) / scale;
startY = getDensityIndependentValue(startY, ctx) / scale;
endX = getDensityIndependentValue(endX, ctx) / scale;
endY = getDensityIndependentValue(endY, ctx) / scale;
if(mLastTouchedSelectionHandle == SELECTION_START_HANDLE && startX > 0 && startY > 0){
final String saveStartString = String.format("javascript: android.selection.setStartPos(%f, %f);", startX, startY);
((Activity)ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl(saveStartString);
}
});
}
if(mLastTouchedSelectionHandle == SELECTION_END_HANDLE && endX > 0 && endY > 0){
final String saveEndString = String.format("javascript: android.selection.setEndPos(%f, %f);", endX, endY);
((Activity)ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl(saveEndString);
}
});
}
}
//*****************************************************
//*
//* Context Menu Creation
//*
//*****************************************************
/**
* Shows the context menu using the given region as an anchor point.
* @param region
*/
private void showContextMenu(Rect displayRect){
// Don't show this twice
if(this.contextMenuVisible){
return;
}
// Don't use empty rect
//if(displayRect.isEmpty()){
if(displayRect.right <= displayRect.left){
return;
}
//Copy action item
ActionItem buttonOne = new ActionItem();
buttonOne.setTitle("HighLight");
buttonOne.setActionId(1);
//buttonOne.setIcon(getResources().getDrawable(R.drawable.menu_search));
//Highlight action item
ActionItem buttonTwo = new ActionItem();
buttonTwo.setTitle("Note");
buttonTwo.setActionId(2);
//buttonTwo.setIcon(getResources().getDrawable(R.drawable.menu_info));
ActionItem buttonThree = new ActionItem();
buttonThree.setTitle("Help");
buttonThree.setActionId(3);
//buttonThree.setIcon(getResources().getDrawable(R.drawable.menu_eraser));
// The action menu
mContextMenu = new QuickAction(this.getContext());
mContextMenu.setOnDismissListener(this);
// Add buttons
mContextMenu.addActionItem(buttonOne);
mContextMenu.addActionItem(buttonTwo);
mContextMenu.addActionItem(buttonThree);
//setup the action item click listener
mContextMenu.setOnActionItemClickListener(new QuickAction.OnActionItemClickListener() {
@Override
public void onItemClick(QuickAction source, int pos,
int actionId) {
if (actionId == 1) {
callHighLight();
}
else if (actionId == 2) {
callNote();
}
else if (actionId == 3) {
// Do Button 3 stuff
Log.i(TAG, "Hit Button 3");
}
contextMenuVisible = false;
}
});
this.contextMenuVisible = true;
mContextMenu.show(this, displayRect);
}
private void callHighLight(){
((Activity)this.ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl("javascript:init_txt_selection_event()");
loadUrl("javascript:highlightme_("+0+")");
}
});
}
private void callNote(){
((Activity)this.ctx).runOnUiThread(new Runnable() {
@Override
public void run() {
loadUrl("javascript:init_txt_selection_event()");
loadUrl("javascript:fnGetUserAddedNote('1')");
}
});
}
//*****************************************************
//*
//* OnDismiss Listener
//*
//*****************************************************
/**
* Clears the selection when the context menu is dismissed.
*/
public void onDismiss(){
//clearSelection();
this.contextMenuVisible = false;
}
//*****************************************************
//*
//* Text Selection Javascript Interface Listener
//*
//*****************************************************
/**
* The user has started dragging the selection handles.
*/
public void tsjiStartSelectionMode(){
this.startSelectionMode();
}
/**
* The user has stopped dragging the selection handles.
*/
public void tsjiEndSelectionMode(){
this.endSelectionMode();
}
/**
* The selection has changed
* @param range
* @param text
* @param handleBounds
* @param menuBounds
* @param showHighlight
* @param showUnHighlight
*/@SuppressWarnings("deprecation")
public void tsjiSelectionChanged(String range, String text, String handleBounds, String menuBounds){
try {
//Log.d(TAG, "tsjiSelectionChanged :- handleBounds " + handleBounds);
JSONObject selectionBoundsObject = new JSONObject(handleBounds);
float scale = getDensityIndependentValue(this.getScale(), ctx);
Rect handleRect = new Rect();
handleRect.left = (int) (getDensityDependentValue(selectionBoundsObject.getInt("left"), getContext()) * scale);
handleRect.top = (int) (getDensityDependentValue(selectionBoundsObject.getInt("top"), getContext()) * scale);
handleRect.right = (int) (getDensityDependentValue(selectionBoundsObject.getInt("right"), getContext()) * scale);
handleRect.bottom = (int) (getDensityDependentValue(selectionBoundsObject.getInt("bottom"), getContext()) * scale);
this.mSelectionBounds = handleRect;
this.selectedRange = range;
this.selectedText = text;
JSONObject menuBoundsObject = new JSONObject(menuBounds);
Rect displayRect = new Rect();
displayRect.left = (int) (getDensityDependentValue(menuBoundsObject.getInt("left"), getContext()) * scale);
displayRect.top = (int) (getDensityDependentValue(menuBoundsObject.getInt("top") - 25, getContext()) * scale);
displayRect.right = (int) (getDensityDependentValue(menuBoundsObject.getInt("right"), getContext()) * scale);
displayRect.bottom = (int) (getDensityDependentValue(menuBoundsObject.getInt("bottom") + 25, getContext()) * scale);
if(!this.isInSelectionMode()){
this.startSelectionMode();
}
// This will send the menu rect
this.showContextMenu(displayRect);
drawSelectionHandles();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Receives the content width for the page.
*/
public void tsjiSetContentWidth(float contentWidth){
this.contentWidth = (int) this.getDensityDependentValue(contentWidth, ctx);
}
//*****************************************************
//*
//* Density Conversion
//*
//*****************************************************
/**
* Returns the density dependent value of the given float
* @param val
* @param ctx
* @return
*/
public float getDensityDependentValue(float val, Context ctx){
// Get display from context
Display display = ((WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
// Calculate min bound based on metrics
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
return val * (metrics.densityDpi / 160f);
}
/**
* Returns the density independent value of the given float
* @param val
* @param ctx
* @return
*/
public float getDensityIndependentValue(float val, Context ctx){
// Get display from context
Display display = ((WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
// Calculate min bound based on metrics
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
return val / (metrics.densityDpi / 160f);
}
}
提前致谢!
最佳答案
我意识到这是一个老问题，但没有一个公认的答案，而且提供的答案都没有很多票。
我已经通过创建自定义操作模式回调实现了您想要实现的目标。这允许在(在 WebView 的情况下)用户长按 View 时创建自定义上下文操作栏 (CAB)。 注意: 这仅适用于 4.0+，一件仅适用于 4.4。
创建一个包含自定义菜单布局的新 Android XML 文件。这里以我的(context_menu.xml)为例:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@+id/copy"
android:icon="@drawable/ic_action_copy"
android:showAsAction="always" <!-- Forces this button to be shown -->
android:title="@string/copy">
</item>
<item
android:id="@+id/button2"
android:icon="@drawable/menu_button2icon"
android:showAsAction="ifRoom" <!-- Show if there is room on the screen-->
android:title="@string/button2">
</item>
<!-- Add as many more items as you want.
Note that if you use "ifRoom", an overflow menu will populate
to hold the action items that did not fit in the action bar. -->
</menu>
现在菜单已经定义好了，为它创建一个回调:
public class CustomWebView extends WebView {
private ActionMode.Callback mActionModeCallback;
private class CustomActionModeCallback implements ActionMode.Callback {
// Called when the action mode is created; startActionMode() was called
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);
return true;
}
// Called each time the action mode is shown.
// Always called after onCreateActionMode, but
// may be called multiple times if the mode is invalidated.
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
// Note: This is called every time the selection handlebars move.
return false; // Return false if nothing is done
}
// Called when the user selects a contextual menu item
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.copy:
// Do some stuff for this button
mode.finish(); // Action picked, so close the CAB
return true;
case R.id.button2:
// Do some stuff for this button
mode.finish();
return true;
// Create a case for every item
...
default:
mode.finish();
return false;
}
}
// Called when the user exits the action mode
@Override
public void onDestroyActionMode(ActionMode mode) {
// This will clear the selection highlight and handlebars.
// However, it only works in 4.4; I am still investigating
// how to reliably clear the selection in 4.3 and earlier
clearFocus();
}
}
一旦这些部分就位，覆盖 startActionMode 方法，以便在长按时实际发生回调:
public class CustomWebView extends WebView {
@Override
public ActionMode startActionMode(Callback callback) {
ViewParent parent = getParent();
if (parent == null) {
return null;
}
mActionModeCallback = new CustomActionModeCallback();
return parent.startActionModeForChild(this, mActionModeCallback);
}
}
现在您有一个自定义菜单，当用户长按您的 WebView 时，该菜单将出现并填充。作为引用，我从 Android Developer tutorial 中找到了此信息。并修改了 this answer 中的建议.
最后一点:此技术会覆盖所选文本的 native 复制/粘贴菜单。如果您想维护该功能，您将需要自己实现它。 (这就是为什么我的第一个按钮是“复制”。)如果您需要，请参阅 this Google tutorial了解更多信息以及实现它的正确方法。
关于android - 如何覆盖android webview os 4.1+的默认文本选择？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17024203/
我正在学习如何使用Nokogiri，根据这段代码我遇到了一些问题:require'rubygems'require'mechanize'post_agent=WWW::Mechanize.newpost_page=post_agent.get('http://www.vbulletin.org/forum/showthread.php?t=230708')puts"\nabsolutepathwithtbodygivesnil"putspost_page.parser.xpath('/html/body/div/div/div/div/div/table/tbody/tr/td/div
总的来说，我对ruby还比较陌生，我正在为我正在创建的对象编写一些rspec测试用例。许多测试用例都非常基础，我只是想确保正确填充和返回值。我想知道是否有办法使用循环结构来执行此操作。不必为我要测试的每个方法都设置一个assertEquals。例如:describeitem,"TestingtheItem"doit"willhaveanullvaluetostart"doitem=Item.new#HereIcoulddotheitem.name.shouldbe_nil#thenIcoulddoitem.category.shouldbe_nilendend但我想要一些方法来使用
关闭。这个问题是opinion-based.它目前不接受答案。想要改进这个问题？更新问题，以便editingthispost可以用事实和引用来回答它.关闭4年前。Improvethisquestion我想在固定时间创建一系列低音和高音调的哔哔声。例如:在150毫秒时发出高音调的蜂鸣声在151毫秒时发出低音调的蜂鸣声200毫秒时发出低音调的蜂鸣声250毫秒的高音调蜂鸣声有没有办法在Ruby或Python中做到这一点？我真的不在乎输出编码是什么(.wav、.mp3、.ogg等等)，但我确实想创建一个输出文件。
给定这段代码defcreate@upgrades=User.update_all(["role=?","upgraded"],:id=>params[:upgrade])redirect_toadmin_upgrades_path,:notice=>"Successfullyupgradeduser."end我如何在该操作中实际验证它们是否已保存或未重定向到适当的页面和消息？ 最佳答案 在Rails3中，update_all不返回任何有意义的信息，除了已更新的记录数(这可能取决于您的DBMS是否返回该信息)。http://ar.ru
我在我的项目目录中完成了compasscreate.和compassinitrails。几个问题:我已将我的.sass文件放在public/stylesheets中。这是放置它们的正确位置吗？当我运行compasswatch时，它不会自动编译这些.sass文件。我必须手动指定文件:compasswatchpublic/stylesheets/myfile.sass等。如何让它自动运行？文件ie.css、print.css和screen.css已放在stylesheets/compiled。如何在编译后不让它们重新出现的情况下删除它们？我自己编译的.sass文件编译成compiled/t
我想将html转换为纯文本。不过，我不想只删除标签，我想智能地保留尽可能多的格式。为插入换行符标签，检测段落并格式化它们等。输入非常简单，通常是格式良好的html(不是整个文档，只是一堆内容，通常没有anchor或图像)。我可以将几个正则表达式放在一起，让我达到80%，但我认为可能有一些现有的解决方案更智能。 最佳答案 首先，不要尝试为此使用正则表达式。很有可能你会想出一个脆弱/脆弱的解决方案，它会随着HTML的变化而崩溃，或者很难管理和维护。您可以使用Nokogiri快速解析HTML并提取文本:require'nokogiri'h
我正在寻找执行以下操作的正确语法(在Perl、Shell或Ruby中):#variabletoaccessthedatalinesappendedasafileEND_OF_SCRIPT_MARKERrawdatastartshereanditcontinues. 最佳答案 Perl用__DATA__做这个:#!/usr/bin/perlusestrict;usewarnings;while(){print;}__DATA__Texttoprintgoeshere 关于ruby-如何将脚
Rackup通过Rack的默认处理程序成功运行任何Rack应用程序。例如:classRackAppdefcall(environment)['200',{'Content-Type'=>'text/html'},["Helloworld"]]endendrunRackApp.new但是当最后一行更改为使用Rack的内置CGI处理程序时，rackup给出“NoMethodErrorat/undefinedmethod`call'fornil:NilClass”:Rack::Handler::CGI.runRackApp.newRack的其他内置处理程序也提出了同样的反对意见。例如Rack
在选择我想要运行操作的频率时，唯一的选项是“每天”、“每小时”和“每10分钟”。谢谢!我想为我的Rails3.1应用程序运行调度程序。 最佳答案 这不是一个优雅的解决方案，但您可以安排它每天运行，并在实际开始工作之前检查日期是否为当月的第一天。 关于ruby-如何每月在Heroku运行一次Scheduler插件？，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.com/questions/8692687/
我有一个对象has_many应呈现为xml的子对象。这不是问题。我的问题是我创建了一个Hash包含此数据，就像解析器需要它一样。但是rails自动将整个文件包含在.........我需要摆脱type="array"和我该如何处理？我没有在文档中找到任何内容。 最佳答案 我遇到了同样的问题；这是我的XML:我在用这个:entries.to_xml将散列数据转换为XML，但这会将条目的数据包装到中所以我修改了:entries.to_xml(root:"Contacts")但这仍然将转换后的XML包装在“联系人”中，将我的XML代码修改为