Question

我尝试在我的应用程序中实现此Android TextHighlighter ，但listview以无序的方式显示数据。即，这些条目不会按照代码中建立的顺序出现在列表中。我的列表视图的所有元素都显示出来，但是没有按期望的顺序显示。我想按输入的确切顺序显示我的项目，即最早的条目是列表中的第一项。

那是我的代码：

    public class MainActivity extends AppCompatActivity {
    private static final int DEFAULT_BG_COLOR = Color.YELLOW;
    private static final int DEFAULT_FG_COLOR = Color.RED;

    private TextHighlighter textHighlighter = new TextHighlighter()
      .setBackgroundColor(DEFAULT_BG_COLOR)
      .setForegroundColor(DEFAULT_FG_COLOR);

    private TextHighlighter.Matcher matcher = 
    TextHighlighter.CASE_INSENSITIVE_MATCHER;

    private ListView listView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    QuoteListAdapter adapter = new QuoteListAdapter(QUOTES, textHighlighter);
    listView = (ListView) findViewById(R.id.list_view);
    listView.setAdapter(adapter);

    EditText searchText = (EditText) findViewById(R.id.search_text);
    searchText.addTextChangedListener(searchTextWatcher);

    EditText fgColorText = (EditText) findViewById(R.id.fg_color_text);
    fgColorText.addTextChangedListener(fgColorTextWatcher);

    EditText bgColorText = (EditText) findViewById(R.id.bg_color_text);
    bgColorText.addTextChangedListener(bgColorTextWatcher);

    CheckBox boldText = (CheckBox) findViewById(R.id.bold_text);
    boldText.setOnCheckedChangeListener(boldChangedListener);

    CheckBox italicText = (CheckBox) findViewById(R.id.italic_text);
    italicText.setOnCheckedChangeListener(italicChangedListener);
     }

    private TextWatcher searchTextWatcher = new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
      String text = s.toString();

      if (text.isEmpty()) {
        QuoteListAdapter adapter = new QuoteListAdapter(QUOTES, textHighlighter);
        listView.setAdapter(adapter);
      } else {
        HashMap<String, String> filtered = new HashMap<>();

        for (HashMap.Entry<String, String> entry : QUOTES.entrySet()) {
          if (matcher.isHighlightable(entry.getKey(), text)
              || matcher.isHighlightable(entry.getValue(), text)) {
            filtered.put(entry.getKey(), entry.getValue());
          }
        }
        QuoteListAdapter adapter = new QuoteListAdapter(filtered, textHighlighter);
        listView.setAdapter(adapter);
      }

      textHighlighter.highlight(s.toString(), matcher);
    }

     @Override
     public void afterTextChanged(Editable s) { }
     };

      private TextWatcher fgColorTextWatcher = new TextWatcher() {
     @Override
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
      if (s.toString().isEmpty()) {
        textHighlighter.setForegroundColor(DEFAULT_FG_COLOR);
      } else {
        try {
          int color = Color.parseColor("#" + s.toString());
          textHighlighter.setForegroundColor(color);
        } catch (IllegalArgumentException iae) {
          textHighlighter.resetForegroundColor();
        }
      }
      textHighlighter.invalidate(matcher);
    }

    @Override
    public void afterTextChanged(Editable s) { }
    };

    private TextWatcher bgColorTextWatcher = new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
      if (s.toString().isEmpty()) {
        textHighlighter.setBackgroundColor(DEFAULT_BG_COLOR);
      } else {
        try {
          int color = Color.parseColor("#" + s.toString());
          textHighlighter.setBackgroundColor(color);
        } catch (IllegalArgumentException iae) {
          textHighlighter.resetBackgroundColor();
        }
      }
      textHighlighter.invalidate(matcher);
    }

    @Override
    public void afterTextChanged(Editable s) { }
    };

    private CompoundButton.OnCheckedChangeListener boldChangedListener = new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
      textHighlighter.setBold(isChecked);
      textHighlighter.invalidate(matcher);
     }
     };

     private CompoundButton.OnCheckedChangeListener italicChangedListener = new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
      textHighlighter.setItalic(isChecked);
      textHighlighter.invalidate(matcher);
    }
    };

    private class QuoteListAdapter extends BaseAdapter {
    private ArrayList<HashMap.Entry<String, String>> quotes;
    private TextHighlighter textHighlighter;

    QuoteListAdapter(HashMap<String, String> quotes, TextHighlighter textHighlighter) {
      this.quotes = new ArrayList<>(quotes.entrySet());
      this.textHighlighter = textHighlighter;
    }

    @Override
    public int getCount() {
      return QUOTES.size();
    }

    @Override
    public Object getItem(int position) {
      return quotes.get(position);
    }

    @Override
    public long getItemId(int position) {
      return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      Context context = parent.getContext();

      if (convertView == null) {
        LayoutInflater inflater =
            (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_view_item, parent, false);
        TextView nameTextView = (TextView) convertView.findViewById(R.id.name);
        TextView quoteTextView = (TextView) convertView.findViewById(R.id.quote);
        textHighlighter.addTarget(nameTextView);
        textHighlighter.addTarget(quoteTextView);
      }

      TextView nameTextView = (TextView) convertView.findViewById(R.id.name);
      TextView quoteTextView = (TextView) convertView.findViewById(R.id.quote);
      nameTextView.setText(quotes.get(position).getKey());
      quoteTextView.setText(quotes.get(position).getValue());
      textHighlighter.invalidate(matcher);

      return convertView;
    }
    }

    private static final HashMap<String, String> QUOTES;
    static
    {
    QUOTES = new HashMap<>();
    for (int i = 0; i < 1; i++) {
      QUOTES.put("Edsger Dijkstra" + Integer.toString(i),
          "If debugging is the process of removing software bugs, then programming must be the " +
              "process of putting them in.");

      QUOTES.put("Linus Torvalds" + Integer.toString(i),
          "Most good programmers do programming not because they expect " +
              "to get paid or get adulation by the public, but because it is fun to program.");

      QUOTES.put("Chris Heilmann" + Integer.toString(i),
          "Java is to JavaScript what Car is to Carpet.");

      QUOTES.put("Edward V Berard" + Integer.toString(i),
          "Walking on water and developing software from a " +
              "specification are easy if both are frozen.");

      QUOTES.put("Brian Kernighan" + Integer.toString(i),
          "Debugging is twice as hard as writing the code in the " +
              "first place. Therefore, if you write the code as cleverly as possible, you are, " +
              "by definition, not smart enough to debug it.");

      QUOTES.put("Rick Osborne" + Integer.toString(i),
          "Always code as if the guy who ends up maintaining your code " +
              "will be a violent psychopath who knows where you live.");

      QUOTES.put("Nathan Myhrvold" + Integer.toString(i),
          "Software sucks because users demand it to.");
    }
  }
}

此代码中有什么会令人困扰？任何帮助将不胜感激！

Answer 1

我认为问题出在这里

  QuoteListAdapter adapter = new QuoteListAdapter(filtered, textHighlighter);

您从hashmap进行了“过滤”，但是哈希图不保持任何顺序。因此，当您遍历键时，您将无法获得期望的顺序。

listview项目未按输入顺序显示

1 个答案: