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 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;
}

/**
* 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>