[Android]搜索工具条

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 speakintent.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. */@Overridepublic 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);}}});}@Overridepublic 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_SETbg.addState(new int[] { 16842910, 16842919 }, pressed);// View.ENABLED_FOCUSED_STATE_SETbg.addState(new int[] { 16842908, 16842910 }, focused);// View.ENABLED_STATE_SETbg.addState(new int[] { 16842910 }, normal);// View.FOCUSED_STATE_SETbg.addState(new int[] { 16842908 }, focused);// View.EMPTY_STATE_SETbg.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 speakintent.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.*/@Overrideprotected 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 heardArrayList<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);}@Overridepublic 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

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