步驟:1 創建自定義的WebView類。 此類將在webview文本上長按覆蓋本機操作欄。 此外,它處理不同版本的機器人的選擇案例(在4.0以上測試) 此代碼將使用JavaScript選定的文本。
public class CustomWebView extends WebView {
private Context context;
// override all other constructor to avoid crash
public CustomWebView(Context context) {
super(context);
this.context = context;
WebSettings webviewSettings = getSettings();
webviewSettings.setJavaScriptEnabled(true);
// add JavaScript interface for copy
addJavascriptInterface(new WebAppInterface(context), "JSInterface");
}
// setting custom action bar
private ActionMode mActionMode;
private ActionMode.Callback mSelectActionModeCallback;
private GestureDetector mDetector;
// this will over ride the default action bar on long press
@Override
public ActionMode startActionMode(Callback callback) {
ViewParent parent = getParent();
if (parent == null) {
return null;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
String name = callback.getClass().toString();
if (name.contains("SelectActionModeCallback")) {
mSelectActionModeCallback = callback;
mDetector = new GestureDetector(context,
new CustomGestureListener());
}
}
CustomActionModeCallback mActionModeCallback = new CustomActionModeCallback();
return parent.startActionModeForChild(this, mActionModeCallback);
}
private class CustomActionModeCallback implements ActionMode.Callback {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mActionMode = mode;
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.copy:
getSelectedData();
mode.finish();
return true;
case R.id.share:
mode.finish();
return true;
default:
mode.finish();
return false;
}
}
@Override
public void onDestroyActionMode(ActionMode mode) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
clearFocus();
}else{
if (mSelectActionModeCallback != null) {
mSelectActionModeCallback.onDestroyActionMode(mode);
}
mActionMode = null;
}
}
}
private void getSelectedData(){
String js= "(function getSelectedText() {"+
"var txt;"+
"if (window.getSelection) {"+
"txt = window.getSelection().toString();"+
"} else if (window.document.getSelection) {"+
"txt = window.document.getSelection().toString();"+
"} else if (window.document.selection) {"+
"txt = window.document.selection.createRange().text;"+
"}"+
"JSInterface.getText(txt);"+
"})()";
// calling the js function
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
evaluateJavascript("javascript:"+js, null);
}else{
loadUrl("javascript:"+js);
}
}
private class CustomGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onSingleTapUp(MotionEvent e) {
if (mActionMode != null) {
mActionMode.finish();
return true;
}
return false;
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// Send the event to our gesture detector
// If it is implemented, there will be a return value
if(mDetector !=null)
mDetector.onTouchEvent(event);
// If the detected gesture is unimplemented, send it to the superclass
return super.onTouchEvent(event);
}
}
步驟2: 創建web視圖接口單獨的類。從JavaScript代碼一旦被獲取執行
public class WebAppInterface {
Context mContext;
WebAppInterface(Context c) {
mContext = c;
}
@JavascriptInterface
public void getText(String text) {
// put selected text into clipdata
ClipboardManager clipboard = (ClipboardManager)
mContext.getSystemService(Context.CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("simple text",text);
clipboard.setPrimaryClip(clip);
// gives the toast for selected text
Toast.makeText(mContext, text, Toast.LENGTH_SHORT).show();
}
}
第3步事件 該類listnes: 添加菜單。XML在水庫自定義菜單>菜單文件夾
<?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"
android:title="copy">
</item>
<item
android:id="@+id/share"
android:icon="@drawable/ic_action_share"
android:showAsAction="always"
android:title="share">
</item>
我把下面列出來實現這個幾個環節的幫助: 感謝你們。
如何使用JavaScript的網頁流量 http://developer.android.com/guide/webapps/webview.html#UsingJavaScript
注入的JavaScript Why can't I inject this javascript in the webview on android?
用於覆蓋默認操作欄 How to override default text selection of android webview os 4.1+?
4.0版本。 4.3文本選擇 Webview text selection not clearing
請添加完整片段 – 2016-08-26 20:19:50