19_利用android提供的HanziToPinyin工具类实现汉字与拼接的转换

        汉字转换成拼接的效果有很多实现方式,例如pinyin4j是一个流行的Java库，支持中文字符和拼音之间的转换。拼音输出格式可以定制（后面的博客会详细介绍使用方法）。但是在android的系统应用联系人中也给我们实现了汉字与拼接转换的方式,接下来我们简单介绍一下android中汉字与拼音的转换。

   1.首先到https://github.com/android网站上去下载android提供联系人接口的源码android/platform_packages_providers_contactsprovider

点击 DownLoad ZIP 即可下载

  2.找到platform_packages_providers_contactsprovider-master\src\com\android\providers\contacts 此目录中的HanziToPinyin.java 拷贝到项目中，你会发现此类依赖于底层中的Transliterator.java这个类 所以也要下载此类，下面给出此类的源码如下：

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package libcore.icu;
/**
 * Exposes icu4c's Transliterator.
 */
public final class Transliterator {
  private long peer;
  /**
   * Creates a new Transliterator for the given id.
   */
  public Transliterator(String id) {
    peer = create(id);
  }
  @Override protected synchronized void finalize() throws Throwable {
    try {
      destroy(peer);
      peer = 0;
    } finally {
      super.finalize();
    }
  }
  /**
   * Returns the ids of all known transliterators.
   */
  public static native String[] getAvailableIDs();
  /**
   * Transliterates the specified string.
   */
  public String transliterate(String s) {
    return transliterate(peer, s);
  }
  private static native long create(String id);
  private static native void destroy(long peer);
  private static native String transliterate(long peer, String s);
}

3.下面通过一个案例 说明使用

    3.1效果如下

     备注1.在输入框中输入汉字，点击转换按钮就可以看到效果

4.项目的目录结构

    此目录 可以看到com.example.util及libcore.icu包中的类都是引入android系统的代码,接下来我们具体看一下MainActivity.java的实现.

5.首先看一下MainActivity对应的界面的布局文件

<LinearLayout 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"
    android:orientation="vertical"
    tools:context="${relativePackage}.${activityClass}" >

    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/tv_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
        android:layout_marginTop="20dp"
        android:layout_marginBottom="20dp"
        android:text="@string/hello_world"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="clickView"
        android:text="转换" />

</LinearLayout>

6.MainActivity中的实现

package com.example.pinyin;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.example.util.HanziToPinyin;

public class MainActivity extends Activity {

	//声明EditText控件对象
	private EditText et_content;
	//声明TextView控件对象
	private TextView tv_content;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //获取控件对象
        et_content = (EditText) findViewById(R.id.et_content);
        tv_content = (TextView) findViewById(R.id.tv_content);
    }
    
    public void clickView(View v){
    	//获取EditText输入的文本值
    	String content = et_content.getText().toString();
    	//判断是否为空
    	if(TextUtils.isEmpty(content)||"".equals(content)){
    		Toast.makeText(this, "内容不能为空", 1).show();
    		return;
    	}
    	
    	//转换成拼音
    	String value = HanziToPinyin.getInstance().transliterate(content);
    	//把内容显示到TextView控件上
    	tv_content.setText(value);
    }
}

7.项目清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.pinyin"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>