Android ListView 搜索关键字高亮显示
jopen
11年前
要求 ListView item 的 name 中如果包含了 关键字，则对其进行 高亮。 主要是 用到 Html.fromHtml(source); 方法。
MainActivity.java
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package com.example.highlight; import java.util.ArrayList; import java.util.List; import com.example.android_highlightkeyword.R; import android.os.Bundle; import android.app.Activity; import android.text.Editable; import android.text.Html; import android.text.Spanned; import android.text.TextWatcher; import android.view.Menu; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; public class MainActivity extends Activity { private ListView mListView; private EditText et_input; private String userInput = ""; private List<Data> dataList = new ArrayList<Data>(); private char[] chs = { 'A', 'B', 'C', 'D', 'E', 'M', 'L', 'F', 'X', 'W', 'Z' }; private HightKeywordsAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(); initListViewData(); setListener(); } private void setListener() { et_input.addTextChangedListener(watcher); mAdapter = new HightKeywordsAdapter(); mListView.setAdapter(mAdapter); } private TextWatcher watcher = new TextWatcher() { public void onTextChanged(CharSequence s, int start, int before, int count) { userInput = String.valueOf(s); mAdapter.notifyDataSetChanged(); } public void beforeTextChanged(CharSequence s, int start, int count, int after) { } public void afterTextChanged(Editable s) { } }; private void initListViewData() { for (char ch : chs) { for (int i = 0; i < 5; i++) { Data data = new Data(String.valueOf(ch) + "中国", String.valueOf(ch) + i, String.valueOf(ch)); dataList.add(data); } } } private void findViewById() { et_input = (EditText) findViewById(R.id.et_input); mListView = (ListView) findViewById(R.id.mListView); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } /** * Customize Adapter, so that realize highlighted keywords */ private class HightKeywordsAdapter extends BaseAdapter { @Override public int getCount() { return dataList.size(); } @Override public Object getItem(int position) { return dataList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view; ViewHolder holder; if (convertView == null) { holder = new ViewHolder(); view = View.inflate(getApplicationContext(), R.layout.list_item, null); holder.tv_name = (TextView) view.findViewById(R.id.tv_name); holder.tv_en = (TextView) view.findViewById(R.id.tv_en); holder.tv_sen = (TextView) view.findViewById(R.id.tv_sen); view.setTag(holder); } else { view = convertView; holder = (ViewHolder) view.getTag(); } Data data = dataList.get(position); String name = data.getName(); if (name != null && name.contains(userInput)) { int index = name.indexOf(userInput); int len = userInput.length(); Spanned temp = Html.fromHtml(name.substring(0, index) + "<u><font color=#FF0000>" + name.substring(index, index + len) + "</font></u>" + name.substring(index + len, name.length())); holder.tv_name.setText(temp); } else { holder.tv_name.setText(data.getName()); } holder.tv_en.setText(data.getEn()); holder.tv_sen.setText(data.getSen()); return view; } } static class ViewHolder { public TextView tv_name; public TextView tv_en; public TextView tv_sen; } } 布局文件 activity_main.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" tools:context=".MainActivity" android:background="@drawable/bg"> <EditText android:id="@+id/et_input" android:layout_width="match_parent" android:layout_height="32dp" android:layout_margin="5dp" android:hint="" android:singleLine="true" android:drawableLeft="@drawable/search_icon" android:background="@drawable/search_box"/> <ListView android:id="@+id/mListView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:layout_below="@id/et_input" android:cacheColorHint="@android:color/transparent"/> </RelativeLayout>
Data.java
package com.example.highlight; public class Data { private String name; private String en; private String sen; public Data(String name, String en, String sen) { this.name = name; this.en = en; this.sen = sen; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEn() { return en; } public void setEn(String en) { this.en = en; } public String getSen() { return sen; } public void setSen(String sen) { this.sen = sen; } }