[Android]搜索工具条 EditText

直接给效果图：

由效果图，搜索工具条具备的功能有：

1.实现语音识别，获取关键字

2.EditText有文字输入时，应在该组件末尾显示文件删除按钮，即X符号。

3.EditText与其右边的搜索按钮无缝衔接。

并不是所有的手机都支持语音识别的，所有在启动语音识别之前，应该先进行判断。综合代码如下：

 /**
  * Fire an intent to start the speech recognition activity.
  */
 private void startVoiceRecognitionActivity() {
     Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
     intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
     // Optional text prompt to show to the user when asking them to speak
     intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");

     PackageManager pkgManager = getPackageManager();
     List<ResolveInfo> listResolveInfo = pkgManager.queryIntentActivities(intent, 0);
     if (listResolveInfo == null || listResolveInfo.size() == 0) {
         // 不支持语音识别，弹对话框提示
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle(R.string.speechRecognition);
         builder.setMessage(R.string.speechErrorHint);
         builder.setPositiveButton(R.string.ok, null);
         builder.create().show();
     } else {
         // 正常显示语音识别界面
         startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
     }
 }

全部代码如下：

 package lab.sodino.searchbar;

 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;

 import android.app.Activity;
 import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.StateListDrawable;
 import android.os.Bundle;
 import android.speech.RecognizerIntent;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;

 public class ActSearchBar extends Activity implements OnClickListener, android.content.DialogInterface.OnClickListener {
     private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;
     private Button btnSpeech;
     private Button btnSearch;
     private Button btnClearEdit;
     private EditText edtSearch;
     private String[] arrSpeechKeyword;

     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         btnSpeech = (Button) findViewById(R.id.searchBtnSpeech);
         btnSpeech.setBackgroundDrawable(newSelector(this, R.drawable.search_speech, R.drawable.search_speech_pressed,
                 R.drawable.search_speech));
         btnSpeech.setOnClickListener(this);
         btnSearch = (Button) findViewById(R.id.searchButton);
         btnSearch.setOnClickListener(this);
         btnSearch.setBackgroundDrawable(newSelector(this, R.drawable.search, R.drawable.search_pressed,
                 R.drawable.search_pressed));
         btnClearEdit = (Button) findViewById(R.id.btnClearEdit);
         btnClearEdit.setOnClickListener(this);
         edtSearch = (EditText) findViewById(R.id.searchEdit);
         edtSearch.setBackgroundDrawable(newSelector(this, R.drawable.search_box, R.drawable.search_box_pressed,
                 R.drawable.search_box_pressed));
         edtSearch.setOnClickListener(this);
         edtSearch.addTextChangedListener(new TextWatcher() {
             public void onTextChanged(CharSequence s, int start, int before, int count) {
                 // Log.d("ANDROID_LAB", "OnTextChanged:" + String.valueOf(s) +
                 // " start=" + start + " before=" + before
                 // + " count=" + count);
             }

             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                 // Log.d("ANDROID_LAB", "OnTextChanged before:" +
                 // String.valueOf(s) + " start=" + start + " count="
                 // + count + " after=" + after);
             }

             public void afterTextChanged(Editable s) {
                 // Log.d("ANDROID_LAB", "OnTextChanged after:" +
                 // String.valueOf(s));
                 if (s == null || s.length() == 0) {
                     Log.d("ANDROID_LAB", "btnClear gone");
                     btnClearEdit.setVisibility(View.GONE);
                 } else {
                     Log.d("ANDROID_LAB", "btnClear visible");
                     btnClearEdit.setVisibility(View.VISIBLE);
                 }
             }
         });
     }

     @Override
     public void onClick(View view) {
         if (view == edtSearch) {
             edtSearch.setFocusable(true);
             Log.d("ANDROID_LAB", "edtSearch");
         } else if (view == btnSearch) {

         } else if (view == btnSpeech) {
             startVoiceRecognitionActivity();
         } else if (view == btnClearEdit) {
             edtSearch.setText("");
         }
     }

     /** 设置Selector。 */
     public static StateListDrawable newSelector(Context context, int idNormal, int idPressed, int idFocused) {
         StateListDrawable bg = new StateListDrawable();
         Drawable normal = idNormal == -1 ? null : context.getResources().getDrawable(idNormal);
         Drawable pressed = idPressed == -1 ? null : context.getResources().getDrawable(idPressed);
         Drawable focused = idFocused == -1 ? null : context.getResources().getDrawable(idFocused);
         // View.PRESSED_ENABLED_STATE_SET
         bg.addState(new int[] { 16842910, 16842919 }, pressed);
         // View.ENABLED_FOCUSED_STATE_SET
         bg.addState(new int[] { 16842908, 16842910 }, focused);
         // View.ENABLED_STATE_SET
         bg.addState(new int[] { 16842910 }, normal);
         // View.FOCUSED_STATE_SET
         bg.addState(new int[] { 16842908 }, focused);
         // View.EMPTY_STATE_SET
         bg.addState(new int[] {}, normal);
         return bg;
     }

     /**
      * Fire an intent to start the speech recognition activity.
      */
     private void startVoiceRecognitionActivity() {
         Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
         intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
         // Optional text prompt to show to the user when asking them to speak
         intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");

         PackageManager pkgManager = getPackageManager();
         List<ResolveInfo> listResolveInfo = pkgManager.queryIntentActivities(intent, 0);
         if (listResolveInfo == null || listResolveInfo.size() == 0) {
             // 不支持语音识别，弹对话框提示
             AlertDialog.Builder builder = new AlertDialog.Builder(this);
             builder.setTitle(R.string.speechRecognition);
             builder.setMessage(R.string.speechErrorHint);
             builder.setPositiveButton(R.string.ok, null);
             builder.create().show();
         } else {
             // 正常显示语音识别界面
             startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
         }
     }

     /**
      * Handle the results from the recognition activity.
      */
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
         if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {
             // Fill the list view with the strings the recognizer thought it
             // could have heard
             ArrayList<String> arrResults = intent.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
             int size = arrResults.size();
             arrSpeechKeyword = new String[size];
             for (int i = 0; i < size; i++) {
                 arrSpeechKeyword[i] = arrResults.get(i);
             }
             arrResults.clear();
             arrResults = null;
             AlertDialog.Builder builder = new AlertDialog.Builder(this).setTitle(R.string.searchSpeechHint);
             builder.setItems(arrSpeechKeyword, this);
             builder.create().show();
         }

         super.onActivityResult(requestCode, resultCode, intent);
     }

     @Override
     public void onClick(DialogInterface dialog, int which) {
         if (arrSpeechKeyword != null && arrSpeechKeyword.length > which) {
             edtSearch.setText(arrSpeechKeyword[which]);
         }
     }
 }

/res/layout/search_bar.xml

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="40dip"
     android:layout_marginLeft="10dip"
     android:layout_marginRight="10dip">
     <Button android:layout_width="40dip"
         android:layout_height="wrap_content"
         android:id="@+id/searchBtnSpeech"
         android:layout_gravity="center_vertical|left"
         android:layout_alignParentLeft="true"
         android:layout_centerVertical="true"
         android:focusableInTouchMode="true"
         android:layout_marginRight="10dip"
     ></Button>
     <Button android:layout_width="40dip"
         android:layout_height="fill_parent"
         android:id="@+id/searchButton"
         android:textColor="#ffffffff"
         android:textSize="18sp"
         android:gravity="center"
         android:layout_marginBottom="-1dip"
         android:layout_marginTop="0dip"
         android:layout_alignParentRight="true"
         android:layout_centerVertical="true"
     ></Button>
     <EditText android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:id="@+id/searchEdit"
         android:drawablePadding="5dip"
         android:singleLine="true"
         android:hint="@string/searchHint"
         android:textSize="16sp"
         android:layout_margin="0dip"
         android:layout_toRightOf="@id/searchBtnSpeech"
         android:layout_toLeftOf="@id/searchButton"
         android:layout_centerVertical="true"
     ></EditText>
     <Button android:layout_width="40dip"
         android:layout_height="fill_parent"
         android:id="@+id/btnClearEdit"
         android:background="@drawable/search_clean"
         android:layout_alignRight="@id/searchEdit"
         android:layout_centerVertical="true"
     ></Button>
 </RelativeLayout>

本文内容归CSDN博客博主Sodino 所有
转载请注明出处：http://blog.csdn.net/sodino/article/details/6889297
涉及到的历史帖有：[Android]代码实现StateListDrawable
http://blog.csdn.net/sodino/article/details/6797821