《第一行代码 第2版》源码

郭霖《第一行代码 第2版》源码

package com.example.helloworld;

import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import static org.junit.Assert.*;

/**
 * Instrumentation test which will execute on an Android device.
 *
 * @see Testing documentation
 */
@RunWith（AndroidJUnit4.class）
public class ExampleInstrumentedTest {
    @Test
    public void useAppContext（） throws Exception {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getTargetContext（）;

        assertEquals（“com.example.helloworld“ appContext.getPackageName（））;
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-01-15 05:37  booksource-master\
     文件         270  2018-01-15 05:37  booksource-master\README.md
     目录           0  2018-01-15 05:37  booksource-master\chapter1\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\
     文件          97  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\.gitignore
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\
     文件           7  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\.gitignore
     文件         622  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\build.gradle
     文件         679  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\proguard-rules.pro
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\androidTest\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\androidTest\java\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\androidTest\java\com\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\androidTest\java\com\example\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\androidTest\java\com\example\helloworld\
     文件         748  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\androidTest\java\com\example\helloworld\ExampleInstrumentedTest.java
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\
     文件         667  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\AndroidManifest.xml
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\java\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\java\com\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\java\com\example\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\java\com\example\helloworld\
     文件         473  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\java\com\example\helloworld\HelloWorldActivity.java
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\layout\
     文件         749  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\layout\hello_world_layout.xml
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\mipmap-hdpi\
     文件        3418  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\mipmap-hdpi\ic_launcher.png
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\mipmap-mdpi\
     文件        2206  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\mipmap-mdpi\ic_launcher.png
     目录           0  2018-01-15 05:37  booksource-master\chapter1\HelloWorld\app\src\main\res\mipmap-xhdpi\
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