本文介紹了Android:EditText焦點跳轉到ScrollView中的另一個的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
限時送ChatGPT賬號..
我有多個使用 ViewPager 水平相鄰的片段.每個片段都有一個 ScrollView，其中包含一個帶有許多 EditText 視圖的表.當我單擊 EditText 時，它獲得焦點，然后將其丟失給最左側片段中的其他一些 EditText.有時焦點切換會立即發生，有時在我輸入 EditText 時會發生.通常，最左側片段中最頂部的 EditText 會搶占焦點.
I have multiple fragments horizontally adjacent using a ViewPager. Each fragment has a ScrollView that contains a table with many EditText views. When I click on a EditText, it gains focus and then loses it to some other EditText in the leftmost fragment. Sometimes the focus switch happens immediately, sometimes while I am typing into a EditText. Usually, the topmost EditText in the leftmost fragment steals focus.
單擊最左側片段中的 EditText 時，我看不到問題，即使它不是最頂部的片段.它就像 Android 不喜歡關注不在左邊緣的 TextView.這聽起來很熟悉嗎?
I don't see the problem when a EditText in the leftmost fragment is clicked, even if it is not the topmost one. Its like Android doesn't like focusing on a TextView that is not along the left edge. Does this sound familiar?
按照 Skip 在 randomly- 中的建議，我嘗試覆蓋 ScrollView 中的 findFocus() 方法，但未成功跳躍.附上的源代碼很大，但可能對其他人有用...
I have unsuccessfully tried overriding the findFocus() method in ScrollView as suggested by Skip in randomly-jumping. The source code attached is huge, but it may be useful to others...
package com.example.slideViewPager;
import java.util.ArrayList;
import com.example.slideViewPager.R;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
public class SlideViewPager extends FragmentActivity {
private static Context g;
private static ArrayList<String> pages;
private static int currentItem; // restore page position after tilt
private static int[] scrollStateY;
private static NotesViewFragment[] fragmentArray;
private static int id; // to create unique view ids
@Override
public void onCreate(Bundle savedInstanceState) {
g = getApplicationContext();
setContentView(R.layout.activity_slide_view_pager);
pages = new ArrayList<String>();
for (int i = 0; i < 4; ++i)
pages.add(Integer.toString(i));
if (savedInstanceState == null) {
currentItem = 0;
scrollStateY = new int[pages.size()]; // assume all 0s
id = 0;
}
else {
currentItem = savedInstanceState.getInt("currentItem");
scrollStateY = savedInstanceState.getIntArray("scrollStateY");
id = savedInstanceState.getInt("id");
System.out.println("Notes onCreate RESTORE: currentItem="+currentItem+"; id="+id);
}
fragmentArray = new NotesViewFragment[pages.size()];
System.out.println("onCreate: start");
super.onCreate(savedInstanceState);
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
NotesPagerAdapter pagerAdapter = new NotesPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(pagerAdapter);
viewPager.setCurrentItem(currentItem);
viewPager.setOnPageChangeListener(onPageChangeListener);
System.out.println("onCreate: done");
}
@Override
public void onSaveInstanceState(Bundle bundle) {
System.out.println("Notes: onSaveInstanceState: currentItem="+currentItem);
super.onSaveInstanceState(bundle);
bundle.putInt("currentItem", currentItem);
bundle.putIntArray("scrollStateY", scrollStateY);
bundle.putInt("id", id);
}
public void onBackPressed() {
System.out.println("Notes: onBackPressed: currentItem="+currentItem);
super.onBackPressed();
}
/////////////////////////////////////////////////////////////////
public static class NotesPagerAdapter extends FragmentPagerAdapter {
public NotesPagerAdapter(FragmentManager fm) {
super(fm);
System.out.println("NotesPagerAdapter: this="+this);
}
@Override
public Fragment getItem(int position) {
String pageNum = pages.get(position);
NotesViewFragment notesViewFragment = NotesViewFragment.initialize(pageNum, position); // create new fragment
System.out.println("NotesPagerAdapter: getItem: CREATED position:"+position+" = page:"+pageNum+"; fragment="+notesViewFragment);
return notesViewFragment;
}
@Override
public int getCount() {
return pages.size();
}
// nothing being done here
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
System.out.println("NotesPagerAdapter: destroyItem position="+position);
super.destroyItem(container, position, object);
}
@Override
public float getPageWidth(int position) {
System.out.println("NotesPagerAdapter: getPageWidth position="+position);
return (1.0f/2); // vary # pages/view
}
}
//////////////////////////////////////////////////////
public static class NotesViewFragment extends Fragment {
private int position; // needed to save scrollY into scrollStateY[]
private String pageNum; // index
private ScrollView itemScrollView;
public NotesViewFragment() {
super();
System.out.println("NotesViewFragment: new this:"+this);
}
public static NotesViewFragment initialize(String page, int position) {
NotesViewFragment notesViewFragment = new NotesViewFragment();
System.out.println("NotesViewFragment: initialize: this:"+notesViewFragment+"; page: "+page+"; position="+position);
Bundle args = new Bundle();
args.putString("pageNum", page);
args.putInt("position", position);
scrollStateY[position] = 0; // start at top
notesViewFragment.setArguments(args);
return notesViewFragment;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
System.out.println("NotesViewFragment: onSaveInstanceState this:"+this+"; page: "+pageNum+"; scrollView="+itemScrollView);
// itemScrollView will be null occasionally (attached but not createViewed)
if (itemScrollView != null)
scrollStateY[position] = itemScrollView.getScrollY();
outState.putString("pageNum", pageNum);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle args = getArguments();
if (args != null) {
pageNum = args.getString("pageNum");
position = args.getInt("position");
fragmentArray[position] = this;
System.out.println("NotesViewFragment: onCreate: this:"+this+"; page: "+pageNum+"; position="+position+"; yPos="+scrollStateY[position]);
}
else // should not happen
System.out.println("NotesViewFragment: onCreate: NO ARGS !!! this:"+this);
}
public void onDestroyView() {
super.onDestroyView();
if (itemScrollView != null) // could be null if not createViewed
scrollStateY[position] = itemScrollView.getScrollY();
System.out.println("NotesViewFragment: onDestroyView: "+pageNum+" this="+this+"; scrollY="+scrollStateY[position]);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (savedInstanceState != null) { // config change happened
pageNum = savedInstanceState.getString("pageNum");
System.out.println("NotesViewFragment: onCreateView: RESTORED "+pageNum+" this="+this+"; yPos="+scrollStateY[position]);
}
else
System.out.println("NotesViewFragment: onCreateView: "+pageNum+"; this="+this);
// Inflate the layout containing a title and body text.
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_screen_slide_page, container, false);
TableLayout itemNotesTable = (TableLayout) rootView.findViewById(R.id.tableLayoutNotes);
TextView itemTitle = (TextView) rootView.findViewById(R.id.textViewTitle);
itemScrollView = (ScrollView) rootView.findViewById(R.id.scroll_form);
itemTitle.setText("Team "+pageNum);
for (int i = 0; i < 12; ++i) {
TableRow tr = new TableRow(g);
tr.setId(++id);
ImageView itemThumbnail = new ImageView(g);
itemThumbnail.setId(++id);
itemThumbnail.setImageResource(R.drawable.notes); // set icon
tr.addView(itemThumbnail);
LinearLayout ll = new LinearLayout(g);
ll.setId(++id);
ll.setOrientation(LinearLayout.VERTICAL);
String text = " Team "+pageNum;
ll.addView(makeTextItem(text, false));
TextView textView;
if ((id % 2) == 0) { // make some entries editable
textView = new EditText(g);
textView.setFocusable(true);
textView.setFocusableInTouchMode(true);
textView.setImeOptions(EditorInfo.IME_FLAG_NO_ENTER_ACTION);
textView.setOnFocusChangeListener(onFocusChangeListener);
}
else
textView = new TextView(g);
textView.setId(++id);
String str = "Line "+i+" is blah blah blah and more blah blah blah";
textView.setText(str);
textView.setTextColor(Color.BLACK);
textView.setTextSize(16);
textView.setPadding(2, 2, 2, 2); // start, top, end, bottom
ll.addView(textView);
tr.addView(ll);
itemNotesTable.addView(tr);
tr.setOnClickListener(noteClicked); // make everything in table row clickable
}
if (scrollStateY[position] != 0) {
itemScrollView.post(new Runnable() {
public void run() {
itemScrollView.scrollTo(0, scrollStateY[position]);
}
});
}
return rootView;
}
// called from fillNotes
private static TextView makeTextItem(String label, boolean bold) {
TextView item = new TextView(g);
item.setId(++id);
item.setText(label);
item.setTextColor(Color.BLACK);
item.setTextSize(16);
if (bold)
item.setTypeface(null, Typeface.BOLD);
return item;
}
}
// listens for horizontal page scrolls
ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
System.out.println("onPageChangeListener: leaving page:"+currentItem+"; for page: "+position);
currentItem = position;
}
};
static View.OnFocusChangeListener onFocusChangeListener = new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View view, boolean hasFocus) {
System.out.println("onFocusChangeListener: "+hasFocus+"; "+view);
if (! hasFocus) {
EditText editText = (EditText) view;
String text = editText.getText().toString();
System.out.println("onFocusChangeListener: "+text);
}
}
};
static OnClickListener noteClicked = new OnClickListener() {
public void onClick(View tr) {
for (View parent = tr; parent != null; parent = (View) parent.getParent()) {
for (NotesViewFragment fragment : fragmentArray)
if (fragment != null && fragment.itemScrollView == parent) {
System.out.println("noteClicked: page: "+fragment.pageNum);
return;
}
}
}
};
}
有幾個 XML 文件:fragment_screen_slide_page.xml ..........
There are a couple of XML files: fragment_screen_slide_page.xml ..........
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textViewTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text=""
android:textAppearance="?android:attr/textAppearanceLarge" />
<View
android:id="@+id/separator"
android:layout_width="fill_parent"
android:layout_height="1dip"
android:layout_alignParentRight="true"
android:layout_marginTop="4dp"
android:layout_below="@+id/textViewTitle"
android:background="#888888" />
<ScrollView
android:id="@+id/scroll_form"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/separator" >
<TableLayout
android:id="@+id/tableLayoutNotes"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="1" >
</TableLayout>
</ScrollView>
</RelativeLayout>
和activity_slide_view_pager.xml ----------
and activity_slide_view_pager.xml ----------
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true"
tools:context=".Page" >
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
推薦答案
焦點正在更改到最左邊的片段，因為該片段是 ViewPager 的當前項.您可以嘗試使用 setCurrentItem(item) 將當前項目設置為另一個片段(當用戶單擊它時)，這樣左邊的項目就不會竊取焦點.
Focus is changing to the leftmost fragment because that fragment is the current item of the ViewPager. You might try to use setCurrentItem(item) to set the current item to the other fragment (when the user clicks on it) so the left one doesn't steal focus.
發生這種情況是因為在 ViewPager 的 populate() 函數結束時，它總是將焦點放在當前項目中的視圖上.您還可以通過復制 ViewPager 源并更改此代碼以允許屏幕讓孩子專注.
This is happening because at the end of the populate() function of the ViewPager it will always give focus to a view that is in the current item. You could also fix this issue by copying the ViewPager source and changing this code to allow any fragment which is on the
screen to have a child with focus.
改變這個:
if (hasFocus()) {
View currentFocused = findFocus();
ItemInfo ii = currentFocused != null ? infoForAnyChild(currentFocused) : null;
if (ii == null || ii.position != mCurItem) {
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
if (child.requestFocus(FOCUS_FORWARD)) {
break;
}
}
}
}
}
這樣的:
if (hasFocus()) {
View currentFocused = findFocus();
ItemInfo ii = currentFocused != null ? infoForAnyChild(currentFocused) : null;
if (ii == null || !infoIsOnScreen(ii)) {
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
ii = infoForChild(child);
if (ii != null && infoIsOnScreen(ii)) {
if (child.requestFocus(FOCUS_FORWARD)) {
break;
}
}
}
}
}
public boolean infoIsOnScreen(ItemInfo info) {
// Code to determine if the view is on the screen using ii.offset etc.
}
這篇關于Android:EditText焦點跳轉到ScrollView中的另一個的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！
【網站聲明】本站部分內容來源于互聯網,旨在幫助大家更快的解決問題，如果有圖片或者內容侵犯了您的權益，請聯系我們刪除處理，感謝您的支持！