原文:http://www.devdiv.com/article-2715-1.html
[Android]搜索工具条
2011-10-20 07:50|发布者: Vincent|评论: 35|原作者: Sodino
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。 <ignore_js_op>
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 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);
- }
- }
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重写Activity的onActivityResult(int requestCode, int resultCode, Intent intent) {},将可以由Intent得到语音识别的过滤结果。 详细代码如下: lab.sodino.searchbar.ActSearchBar 语音识别代码参考自ApiDemo
- 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 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 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]);
- }
- }
- }
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/res/layout/search_bar.xml
- android:layout_width="fill_parent"
- android:layout_height="40dip"
- android:layout_marginLeft="10dip"
- android:layout_marginRight="10dip">
-
- 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"
- >
-
- 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"
- >
-
- 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"
- >
-
- android:layout_height="fill_parent"
- android:id="@+id/btnClearEdit"
- android:background="@drawable/search_clean"
- android:layout_alignRight="@id/searchEdit"
- android:layout_centerVertical="true"
- >
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本例子对于我来说最重要的是search_bar.xml,哈哈。 涉及到的历史帖有: [Android]代码实现StateListDrawable http://www.devdiv.com/thread-92751-1-1.html |
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