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