界面

<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.lenovo.helloworld.MainActivity"
android:orientation="vertical">

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />

<EditText
android:id="@+id/ediTtext"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SAY HELLO"/>

</LinearLayout>




JAVA代码
package com.example.lenovo.helloworld;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void sayHello(View view){
TextView textView=(TextView)findViewById(R.id.textView);
EditText editText=(EditText)findViewById(R.id.ediTtext);
textView.setText("Hello,"+editText.getText().toString()+"!");
}
}



app代码
apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "24.0.2"

defaultConfig {
applicationId "com.example.jiangtinghui.helloworld"
minSdkVersion 21
targetSdkVersion 23
versionCode 1
versionName "1.0"
//add for test
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
//add for test
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
}

androidTestCompile 'org.testng:testng:6.9.6'
androidTestCompile 'org.testng:testng:6.9.6'
}



MainActivityInstrumentation代码

 

package com.example.lenovo.helloworld;

import static org.junit.Assert.*;

/**
* Created by lenovo on 2017/3/19.
*/

public class MainActivityInstrumentation {
private static final String STRING_TO_BE_TYPED="Peter";
@Rule
public ActivityTestRule<MainActivity>mActivityRule=new ActivityTestRule<>(MainActivity.class);
@Test
public void sayHello(){
onView(withId(R.id.editText)).perform(typeText(STRING_TO_BE_TYPED).closeSoftKeyboard());

onView(withId(R.id.btn)).perform(click());
String expectedText="Hello,"+STRING_TO_BE_TYPED+"!";
onView(withId(R.id.textview)).check(matches(withText(expectedText)));
}
}