eclipse 如何：添加到收藏夹并查看收藏夹列表
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/7957319/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-09-19 17:15:55 来源:igfitidea点击:
How to: Add to Favourites and View the Favourites list
提问by Niamh Doyle
I'm developing an Android language dictionary app. I'm thinking of a Favourites button that works in two phases:
我正在开发一个 Android 语言词典应用程序。我正在考虑分两个阶段工作的“收藏夹”按钮：
- a short click will add the currently viewed word into the Favourites list;
- and a long click will allow user to view the Favourites list (of added words).
- 短按会将当前查看的单词添加到收藏夹列表中；
- 长按将允许用户查看收藏夹列表（添加的单词）。
I wonder if this is possible, and if yes could you please explain how to do it?
我想知道这是否可能，如果是，你能解释一下如何做吗？
NB: Till now I've only succeeded in adding a Favourites image button to the app, and when short-clicked, it says: "Chosen Word Added to Favourites".
注意：到目前为止，我只成功地向应用程序添加了收藏夹图像按钮，当短按时，它会显示：“已选择的单词已添加到收藏夹”。
Thank you very much in advance.
非常感谢您提前。
采纳答案by JOG
Assuming, say, public class FavViewActivity extends ListActivity, you just add the OnLongClickListener the same way as you added the OnClickListener:
假设，例如，public class FavViewActivity extends ListActivity您只需像添加 OnClickListener 一样添加 OnLongClickListener：
btnAddFavourite = (ImageButton) findViewById(R.id.btnAddFavourite);
btnAddFavourite.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Add code here to save the favourite, e.g. in the db.
}
});
btnAddFavourite.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
// Open the favourite Activity, which in turn will fetch the saved favourites, to show them.
Intent intent = new Intent(getApplicationContext(), FavViewActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(intent);
return false;
}
});
In your db, keep a favourite table listing the id:s of the words that are marked as favourites.
在您的数据库中，保留一个收藏表，列出标记为收藏的单词的 id:s。
For creating a new Activity, like FavViewActivity, there are plenty of guides around.
为了创建一个新的 Activity，比如 FavViewActivity，有很多指南。
For more help, please be more specific about what, and also add what you have tried so far. ^_^
如需更多帮助，请更具体地说明什么，并添加到目前为止您尝试过的内容。^_^
回答by Niamh Doyle
[Updated] @JOG: Thanks a lot. I have managed to make ViewHistory work but still haven't figured out how to view the Favourite list. To be more specific, please find enclosed my ContentView file:
[更新] @JOG：非常感谢。我已经设法使 ViewHistory 工作，但仍然没有弄清楚如何查看收藏夹列表。更具体地说，请找到随附的我的 ContentView 文件：
package viettien.kadict;
import java.util.ArrayList;
import java.util.Arrays;
import viettien.kadict.R;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageButton;
import android.widget.Toast;
public class ContentView extends Activity {
static final private String CONTENT_TAG = "[Kadict - Content]";
static final private int SHOW_HISTORY_CODE = 0;
static final private int SHOW_FAVOURITE_CODE = 1;
static final private int MENU_BACK = Menu.FIRST;
static final private int MENU_FOWARD = Menu.FIRST+1;
static final private int MENU_LIST = Menu.FIRST+2;
static final private int MENU_HISTORY = Menu.FIRST+3;
private static final String MIMETYPE = "text/html";
private static final String ENCODING = "UTF-8";
private WebView wvContent = null;
private ImageButton btnGoBack = null;
private ImageButton btnGoForward = null;
private ImageButton btnShowHistory = null;
private ImageButton btnAddFavourite = null;
private String mCurrentWord;
private String mSelectedDB;
//private String mSelectedDBName;
private String mContentStyle;
private int mCurrentWordId;
private int mCurrentHistoryIndex = -1;
Menu menu = null;
private ArrayList<String> mWordHistory = null;
private SharedPreferences prefs;
private ProgressDialog pd = null;
// create Menu for Program
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
Log.i(CONTENT_TAG, "menu drawed!!");
// Group ID
int groupId = 0;
// The order position of the item
int menuItemOrder = Menu.NONE;
this.menu=menu;
// Added extra items to make sure there's more than six to
// force the extended menu to appear.
menu.add(groupId, MENU_BACK, menuItemOrder, R.string.menuGoBack);
menu.add(groupId, MENU_FOWARD, menuItemOrder, R.string.menuGoForward);
menu.add(groupId, MENU_LIST, menuItemOrder, R.string.menuList);
menu.add(groupId, MENU_HISTORY, menuItemOrder, R.string.menuHistory);
return true;
}
// process event select Menu
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
// Find which menu item has been selected
switch (item.getItemId()) {
case (MENU_BACK):
{
goBack();
break;
}
case (MENU_FOWARD):
{
goForward();
break;
}
case (MENU_LIST):
{
//menuDictionaryManager();
menuList();
break;
}
case (MENU_HISTORY):
{
break;
}
}
return true;
}
public void menuList()
{
/*
* TODO
* - save history list
*/
Intent i = new Intent();
i.putExtra("word", mCurrentWord);
setResult(RESULT_OK,i);
finish();
}
public void goBack()
{
Log.i(CONTENT_TAG,"go back");
String content = getHistoryContent("back");
showContent(content);
}
public void goForward()
{
Log.i(CONTENT_TAG,"go foward");
String content = getHistoryContent("back");
showContent(content);
}
@Override
public void onPause()
{
super.onPause();
saveHistoryToPreferences();
}
public void saveHistoryToPreferences()
{
if (prefs.getBoolean("saveHistory", true) && mWordHistory != null && mWordHistory.size() >= 1)
{
StringBuilder sbHistory = new StringBuilder();
for (String item : mWordHistory)
{
sbHistory.append(item);
sbHistory.append(",");
}
String strHistory = sbHistory.substring(0, sbHistory.length()-1);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("history", strHistory);
editor.commit();
//Log.i(CONTENT_TAG,"history = " + strHistory);
Log.i(CONTENT_TAG,"History saved!");
}
}
public void loadHistoryFromPreferences()
{
if (prefs.getBoolean("saveHistory", true))
{
String strHistory = prefs.getString("history", "");
Log.i(CONTENT_TAG, "History loaded");
if (strHistory != null && !strHistory.equals(""))
{
mWordHistory = new ArrayList<String>(Arrays.asList(strHistory.split(",")));
}
else
{
if (mWordHistory == null)
{
mWordHistory = new ArrayList<String>();
}
else
{
mWordHistory.clear();
}
}
}
else
{
if (mWordHistory == null)
{
mWordHistory = new ArrayList<String>();
}
else
{
mWordHistory.clear();
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.content);
//Log.i(CONTENT_TAG,".................onCreate.................");
Intent i = this.getIntent();
int wordId = i.getIntExtra("id", -1);
mCurrentWord = i.getStringExtra("word");
mSelectedDB = i.getStringExtra("db");
mContentStyle = i.getStringExtra("style");
//Log.i(CONTENT_TAG,"Style from intent = " + mContentStyle);
//Log.d(CONTENT_TAG,"current word = " + mCurrentWord);
prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
loadHistoryFromPreferences();
wvContent = (WebView) findViewById(R.id.wvContent);
initWebview();
String content = getContentById(wordId);
showContent(content);
btnShowHistory = (ImageButton) findViewById(R.id.btnShowHistory);
btnShowHistory.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i(CONTENT_TAG, "Start showing history..");
/* Intent i = new Intent(v.getContext(), HistoryView.class);
HistoryList hl = new HistoryList(mWordHistory);
i.putExtra("history", hl);*/
startActivityForResult(new Intent(v.getContext(),HistoryView.class), SHOW_HISTORY_CODE);
//showHistory();
}
});
btnGoBack = (ImageButton) findViewById(R.id.btnGoBack);
btnGoBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d(CONTENT_TAG, "Start going back");
{
String content = getHistoryContent("back");
if (content == null) // end Activity now
{
menuList();
}
else // go back to previous word
{
showContent(content);
}
menuList();
}
}});
btnGoForward = (ImageButton) findViewById(R.id.btnGoForward);
btnGoForward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d(CONTENT_TAG, "Start going forward");
goForward();
}
});
btnAddFavourite = (ImageButton) findViewById(R.id.btnAddFavourite);
btnAddFavourite.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast toast = Toast.makeText(ContentView.this, R.string.messageWordAddedToFarvourite, Toast.LENGTH_SHORT);
toast.show();
}
});
btnAddFavourite.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
Intent intent = new Intent(getApplicationContext(), SearchActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(intent);
return false;
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode)
{
case SHOW_HISTORY_CODE:
Log.i(CONTENT_TAG,"resultCode = " + resultCode);
if (resultCode == RESULT_OK) // cleared
{
if (data == null)
{
//loadHistoryFromPreferences();
mWordHistory.clear();
Log.i(CONTENT_TAG,"History cleared");
}
else
{
int id = data.getIntExtra("wordId", 0);
String dict = data.getStringExtra("dict");
Log.i(CONTENT_TAG,"id = " + id + " | dict = " + dict);
if (id > 0 && dict != null)
{
mSelectedDB = dict;
String content = getContentById(id);
//initWebview();
showContent(content);
}
}
}
break;
case SHOW_FAVOURITE_CODE:
break;
}
}
/* @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//super.onKeyDown(keyCode, event);
if (keyCode == KeyEvent.KEYCODE_BACK) {
// When the user center presses, let them pick a contact.
Log.d(CONTENT_TAG,"Backkey pressed !!!");
if (mWordHistory != null && mWordHistory.size() > 1 && mCurrentHistoryIndex != 0)
{
String content = getHistoryContent("back");
if (content == null) // end Activity now
{
menuList();
}
else // go back to previous word
{
showContent(content);
}
}
else
{
menuList();
}
return true;
}
return false;
}*/
public void initWebview()
{
setContentView(R.layout.content);
wvContent = (WebView) findViewById(R.id.wvContent);
wvContent.setBackgroundColor(Color.argb(250, 250, 250, 250));
wvContent.setWebViewClient(new WebViewClient()
{
public void onPageFinished(WebView view, String url)
{
if (pd != null)
{
pd.dismiss();
pd = null;
}
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
Log.i(CONTENT_TAG,"WebView link clicked; url = " + url);
try
{
String arrUrlPart[] = url.split("://");
if (arrUrlPart[0].equals("entry"))
{
String content = getContentByWord(arrUrlPart[1]);
showContent(content);
}
else if (arrUrlPart[0].equals("http"))
{
try {
/*Intent i = new Intent();
ComponentName comp = new ComponentName(
"com.google.android.browser",
"com.google.android.browser.BrowserActivity");
i.setComponent(comp);
i.setAction("android.intent.action.VIEW");
i.addCategory("android.intent.category.BROWSABLE");
ContentURI uri = new ContentURI(url);
i.setData(uri);
startSubActivity(i, 2);*/
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
} catch (Exception ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
}
}
}
catch (Exception ex)
{
ex.printStackTrace();
}
return true;
}
});
}
public String getHistoryContent(String type)
{
String currentTerm = mSelectedDB + ":" + mCurrentWordId + ":" + mCurrentWord;
Log.i(CONTENT_TAG,"currentTerm = " +currentTerm);
if (mWordHistory == null || mWordHistory.isEmpty())
{
return null;
}
int pos = mWordHistory.indexOf(currentTerm);
Log.i(CONTENT_TAG,"pos = " + pos);
if (pos <= 0)
{
pos = mWordHistory.size();
}
String item = null;
String searchTerm;
if (type.equals("back"))
{
try
{
for (int i = pos-1; i >= 0 ; i--)
{
searchTerm = mWordHistory.get(i);
searchTerm = searchTerm.substring(0,searchTerm.indexOf("::"));
Log.i(CONTENT_TAG,"item = " + mWordHistory.get(i) + " - searchTerm = " + searchTerm);
if (searchTerm.equals(mSelectedDB))
{
item = mWordHistory.get(i);
mCurrentHistoryIndex = i;
break;
}
}
}
catch (Exception ex)
{
Log.i(CONTENT_TAG,"Error in finding history entry");
}
}
else
{
try
{
for (int i = pos; i < mWordHistory.size() ; i++)
{
searchTerm = mWordHistory.get(i);
searchTerm = searchTerm.substring(0,searchTerm.indexOf("::"));
Log.i(CONTENT_TAG,"item = " + mWordHistory.get(i) + " - searchTerm = " + searchTerm);
if (searchTerm.equals(mSelectedDB))
{
item = mWordHistory.get(i);
mCurrentHistoryIndex = i;
break;
}
}
}
catch (Exception ex)
{
Log.i(CONTENT_TAG,"Error in finding history entry");
}
}
if (item != null) // found previous item
{
Log.i(CONTENT_TAG,"item index = " + mCurrentHistoryIndex);
String arrPart[] = item.split(":");
Uri uri = Uri.parse("content://viettien.kadict.KadictProvider/dict/" + arrPart[0] + "/contentId/" + arrPart[1]);
Log.i(CONTENT_TAG,"History uri = " + uri.toString());
Cursor result = managedQuery(uri,null,null,null,null);
String content;
if (result != null)
{
result.moveToFirst();
content = Utility.decodeContent(result.getString(result.getColumnIndex("content")));
content = formatContent(content);
mSelectedDB = arrPart[0];
mCurrentWordId = Integer.parseInt(arrPart[1]);
mCurrentWord = arrPart[2];
return content;
}
else
{
return null;
}
}
else
{
return null;
}
}
public String getContentById(int id)
{
Uri uri = Uri.parse("content://viettien.kadict.KadictProvider/dict/" + mSelectedDB + "/contentId/" + id);
Cursor result = managedQuery(uri,null,null,null,null);
String content;
if (result != null)
{
result.moveToFirst();
content = Utility.decodeContent(result.getString(result.getColumnIndex("content")));
mCurrentWordId = result.getInt(result.getColumnIndex("id"));
mCurrentWord = result.getString(result.getColumnIndex("word"));
}
else // Word not found
{
content = getString(R.string.errorWordNotFound);
mCurrentWordId = -1;
mCurrentWord = "";
}
content = formatContent(content);
return content;
}
public String getContentByWord(String word)
{
Uri uri = Uri.parse("content://viettien.kadict.KadictProvider/dict/" + mSelectedDB + "/contentWord/" + word);
Log.i(CONTENT_TAG,"uri = " + uri.toString());
Cursor result = managedQuery(uri,null,null,null,null);
String content;
if (result != null && result.getCount() > 0)
{
result.moveToFirst();
content = Utility.decodeContent(result.getString(result.getColumnIndex("content")));
mCurrentWordId = result.getInt(result.getColumnIndex("id"));
mCurrentWord = result.getString(result.getColumnIndex("word"));
}
else
{
content = getString(R.string.errorWordNotFound) + word;
mCurrentWordId = -1;
mCurrentWord = "";
}
content = formatContent(content);
return content;
}
public void saveHistory()
{
String item = mSelectedDB + "::" + mCurrentWordId + "::" + mCurrentWord;
if (mWordHistory.indexOf(item) == -1 && mCurrentWordId != -1) // new item
{
mWordHistory.add(item);
mCurrentHistoryIndex = mWordHistory.size();
if (menu != null)
{
menu.findItem(MENU_FOWARD).setEnabled(false);
if (mWordHistory.size() == 1)
{
menu.findItem(MENU_BACK).setEnabled(false);
}
}
//Log.i(CONTENT_TAG,"new item added " + item);
}
}
public String formatContent(String content)
{
StringBuilder htmlData = new StringBuilder();
htmlData.append("<html><meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\"/>\n");
if (mContentStyle != null && !mContentStyle.equals(""))
{
htmlData.append("<head><style type=\"text/css\">"+mContentStyle+"</style></head>\n");
}
htmlData.append("<body><font face=\"Arial\">");
htmlData.append(content);
htmlData.append("</font></body></html>");
return htmlData.toString();
}
public void showContent(String content)
{
if (content != null)
{
pd = ProgressDialog.show(this, "Working...", "Loading content", true,false);
saveHistory();
wvContent.loadDataWithBaseURL (null, content, MIMETYPE, ENCODING,"about:blank");
}
}
}
