Android第四个功能：文件读取，并且用单元测试进行测试

添加的核心代码三部分：

1、FileService.java中添加五个读取的方法

2、新建一个测试类FileServiceTest.java

3、AndroidManifest.xml中添加导入，和指定测试运行器，及包

在上一个功能的项目中继续完成

/** * 读取文件内容 * @param filename 文件名称 * @return 文件内容 * @throws Exception */public String read(String filename) throws Exception  {FileInputStream inStream = context.openFileInput(filename);ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = inStream.read(buffer)) != -1) {outStream.write(buffer, 0, len);}byte[] data = outStream.toByteArray();return new String(data);}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.dcj"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >     <uses-library android:name="android.test.runner" />        <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>     <instrumentation        android:name="android.test.InstrumentationTestRunner"        android:targetPackage="com.dcj"         android:label="Test for my App"/></manifest>

package com.dcj.test;import com.dcj.service.FileService;import android.test.AndroidTestCase;import android.util.Log;public class FileServiceTest extends AndroidTestCase {private static final String TAG = "FileServiceTest";public void testRead() throws Exception {FileService service = new FileService(this.getContext());String result = service.read("dcj.txt");Log.i(TAG, result);}}

写好之后运行FileServiceTest文件，然后查看LogCat

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