利用Android Studio快速搭建App

大家好，我是烤鸭:

给大家分享一个简单的用Android Studio快速搭建app

工具：

Android Studio 64位专业版

插件:

Datepicker Timepicker okhttp

实现需求：

界面上选择时间，发get/post请求到后台，获取选择的时间。

1.修改AndroidManifest.xml文件

其中可以修改app样式，app图标，进入app的最先执行哪个activity，

最重要的！！！

创建的activity一定要在这里注册。

项目名/app/build.gradle中添加依赖，这里贴一下我用到的。

apply plugin: 'com.android.application'android {compileSdkVersion 26defaultConfig {applicationId "com.example.gmwang.washapplication"minSdkVersion 15targetSdkVersion 26versionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}
}dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'com.android.support:appcompat-v7:26.1.0'implementation 'com.android.support.constraint:constraint-layout:1.0.2'testImplementation 'junit:junit:4.12'androidTestImplementation 'com.android.support.test:runner:1.0.1'androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'compile 'pl.droidsonroids.gif:android-gif-drawable:1.2.7'compile 'com.squareup.okhttp3:okhttp:3.3.0'compile 'com.android.support:design:+'compile 'com.zhy:okhttputils:2.6.1'compile 'com.alibaba:fastjson:1.2.7'
}

2.创建Splash页面

可以看到上面我设置的最先跳转的activity是SplashActivity，这是一个过渡页面，一般app都是有一个页面或者是广告，等几秒再进入app的首页。

创建SplashActivity

package com.example.gmwang.washapplication;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;import java.util.Timer;
import java.util.TimerTask;/*** Created by gmwang on 2017/11/15.*/public class SplashActivity extends Activity {Timer timer;Message message;private Handler handler = new Handler() {public void handleMessage(Message msg) {switch (msg.what) {case 1:if (timer != null) {timer.cancel();timer = null;}Intent i = new Intent(SplashActivity.this,WashViewActivity.class);startActivity(i);break;default:break;}}};@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_spalsh);timer = new Timer();timer.scheduleAtFixedRate(new TimerTask() {@Overridepublic void run() {message = new Message();message.what = 1;handler.sendMessage(message);}}, 3000, 3000);}
}

先说这一行：

setContentView(R.layout.activity_spalsh);

需要创建activity_spalsh的layout，就是页面。

这里就是画了一个简单的页面，里边放了一张图。

代码如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#333333"><pl.droidsonroids.gif.GifImageViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:src="@drawable/wash"/>
</LinearLayout>

再说这一行：

Intent i = new Intent(SplashActivity.this,WashViewActivity.class);

就是从这个页面3秒之后，跳转到哪个acticity。

3.创建WashViewActivity页面

这个页面就稍微复杂点，需要有picker插件和okhttp。

先把代码贴出来：

package com.example.gmwang.washapplication;import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.constraint.ConstraintLayout;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;import com.alibaba.fastjson.JSONObject;
import com.example.gmwang.washapplication.utils.Constants;
import com.zhy.http.okhttp.OkHttpUtils;
import com.zhy.http.okhttp.callback.StringCallback;import java.util.Calendar;import okhttp3.Call;/*** Created by gmwang on 2017/11/24.*/public class WashViewActivity extends Activity {private TextView tvShowDialog;private TextView timeDialog;private Calendar cal;private int year, month, day;private int hour, minute;private String dateString = "0000";private String timeString = "0000";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_washview);Button recordButton = findViewById(R.id.recordId);Button recordListButton = findViewById(R.id.recordList);tvShowDialog = (TextView) findViewById(R.id.tvShowDialog);timeDialog = (TextView) findViewById(R.id.timeDialog);//获取当前日期getDate();tvShowDialog.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.tvShowDialog:DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener() {@Overridepublic void onDateSet(DatePicker arg0, int year, int month, int day) {dateString = year + "-" + (++month) + "-" + day;tvShowDialog.setText(dateString);      //将选择的日期显示到TextView中,因为之前获取month直接使用，所以不需要+1，这个地方需要显示，所以+1}};DatePickerDialog dialog = new DatePickerDialog(WashViewActivity.this, 0, listener, year, month, day);//后边三个参数为显示dialog时默认的日期，月份从0开始，0-11对应1-12个月dialog.show();break;default:break;}}});timeDialog.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.timeDialog:TimePickerDialog.OnTimeSetListener listener = new TimePickerDialog.OnTimeSetListener() {@Overridepublic void onTimeSet(TimePicker timePicker, int hour, int minute) {timeString = hour + ":"+minute;timeDialog.setText(timeString);}};TimePickerDialog dialog = new TimePickerDialog(WashViewActivity.this, 0, listener, hour, minute,true);dialog.show();break;default:break;}}});recordButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Log.e("recordButton",dateString);if(TextUtils.isEmpty(tvShowDialog.getText())){Toast.makeText(getApplicationContext(), "请先选择日期！！！！！！", Toast.LENGTH_LONG).show();return ;}if(TextUtils.isEmpty(timeDialog.getText())){Toast.makeText(getApplicationContext(), "请先选择时间！！！！！！", Toast.LENGTH_LONG).show();return ;}String url = Constants.url+"addRecord";StringBuffer sb = new StringBuffer();OkHttpUtils.get().url(url).addParams("cuuid","66666").addParams("washDate", dateString).addParams("washTime",timeString).build().execute(new StringCallback() {@Overridepublic void onError(Call call, Exception e, int id) {Log.e("onError:", e.toString());}@Overridepublic void onResponse(String response, int id) {Log.e("onResponse:", response);JSONObject responseJson = (JSONObject) JSONObject.parse(response);String code = responseJson.getString("code");String message = responseJson.getString("message");//保存成功if("100".equals(responseJson.get("code"))){Toast.makeText(getApplicationContext(), code+","+responseJson.get("message"), Toast.LENGTH_LONG).show();}else{Toast.makeText(getApplicationContext(), code+","+responseJson.get("message"), Toast.LENGTH_LONG).show();}}});}});}//获取当前日期private void getDate() {cal = Calendar.getInstance();year = cal.get(Calendar.YEAR);       //获取年月日时分秒Log.i("wxy", "year" + year);month = cal.get(Calendar.MONTH);   //获取到的月份是从0开始计数day = cal.get(Calendar.DAY_OF_MONTH);hour = cal.get(Calendar.HOUR_OF_DAY);minute = cal.get(Calendar.MINUTE);}
}

代码有点多，我们一行一行看：

setContentView(R.layout.activity_washview);

跟上面一样，去画个页面activity_washview去，页面上有时间选择插件。

效果：

3.1 activity_washview代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.gmwang.washapplication.MainActivity"><RelativeLayoutandroid:id="@+id/rle1"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="76dp"><TextViewandroid:id="@+id/dateText"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:layout_marginLeft="10dp"android:text="日期" /><EditTextandroid:id="@+id/tvShowDialog"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginLeft="10dp"android:layout_marginRight="10dp"android:layout_toRightOf="@+id/dateText"android:background="@drawable/dateshape"android:focusable="false" /></RelativeLayout><RelativeLayoutandroid:id="@+id/r_time"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="116dp"><TextViewandroid:id="@+id/timeText"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:layout_marginLeft="10dp"android:text="时间" /><EditTextandroid:id="@+id/timeDialog"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginLeft="10dp"android:layout_marginRight="10dp"android:layout_toRightOf="@+id/timeText"android:background="@drawable/dateshape"android:focusable="false"/></RelativeLayout><RelativeLayoutandroid:id="@+id/rle2"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="156dp"></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_alignParentStart="true"android:layout_alignTop="@+id/rle1">><Buttonandroid:id="@+id/recordId"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="80dp"android:layout_marginTop="200dp"android:text="record"android:textColor="#f00"android:background="@drawable/button"/></RelativeLayout>
</RelativeLayout>

3.2 贴一下自定义样式，就是个边框,dateshape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"><stroke android:color="#000000"android:width="0.5dp"></stroke>
</shape>

3.3 关于textview和button

定义的textview和button都是根据id来找的。

比如：

private TextView tvShowDialog;

tvShowDialog = (TextView) findViewById(R.id.tvShowDialog);

这样就找到这个textView，就可以给他赋值或者其他操作了。button也是一样。

3.4 时间选择插件

DatePicker插件：

tvShowDialog.setOnClickListener 是选择后获取年/月/日/的

TimeDatePicker插件：

timeDialog.setOnClickListener 是选择后获取时/分/的

3.5 http请求

后面的按钮点击方法

recordButton.setOnClickListener，发送http请求，利用okhttp组件

可以看到这里的OkHttpUtils，贴一下代码

package com.zhy.http.okhttp;import com.zhy.http.okhttp.builder.GetBuilder;
import com.zhy.http.okhttp.builder.HeadBuilder;
import com.zhy.http.okhttp.builder.OtherRequestBuilder;
import com.zhy.http.okhttp.builder.PostFileBuilder;
import com.zhy.http.okhttp.builder.PostFormBuilder;
import com.zhy.http.okhttp.builder.PostStringBuilder;
import com.zhy.http.okhttp.callback.Callback;
import com.zhy.http.okhttp.request.RequestCall;
import com.zhy.http.okhttp.utils.Platform;import java.io.IOException;
import java.util.concurrent.Executor;import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Response;/*** Created by zhy on 15/8/17.*/
public class OkHttpUtils
{public static final long DEFAULT_MILLISECONDS = 10_000L;private volatile static OkHttpUtils mInstance;private OkHttpClient mOkHttpClient;private Platform mPlatform;public OkHttpUtils(OkHttpClient okHttpClient){if (okHttpClient == null){mOkHttpClient = new OkHttpClient();} else{mOkHttpClient = okHttpClient;}mPlatform = Platform.get();}public static OkHttpUtils initClient(OkHttpClient okHttpClient){if (mInstance == null){synchronized (OkHttpUtils.class){if (mInstance == null){mInstance = new OkHttpUtils(okHttpClient);}}}return mInstance;}public static OkHttpUtils getInstance(){return initClient(null);}public Executor getDelivery(){return mPlatform.defaultCallbackExecutor();}public OkHttpClient getOkHttpClient(){return mOkHttpClient;}public static GetBuilder get(){return new GetBuilder();}public static PostStringBuilder postString(){return new PostStringBuilder();}public static PostFileBuilder postFile(){return new PostFileBuilder();}public static PostFormBuilder post(){return new PostFormBuilder();}public static OtherRequestBuilder put(){return new OtherRequestBuilder(METHOD.PUT);}public static HeadBuilder head(){return new HeadBuilder();}public static OtherRequestBuilder delete(){return new OtherRequestBuilder(METHOD.DELETE);}public static OtherRequestBuilder patch(){return new OtherRequestBuilder(METHOD.PATCH);}public void execute(final RequestCall requestCall, Callback callback){if (callback == null)callback = Callback.CALLBACK_DEFAULT;final Callback finalCallback = callback;final int id = requestCall.getOkHttpRequest().getId();requestCall.getCall().enqueue(new okhttp3.Callback(){@Overridepublic void onFailure(Call call, final IOException e){sendFailResultCallback(call, e, finalCallback, id);}@Overridepublic void onResponse(final Call call, final Response response){if (call.isCanceled()){sendFailResultCallback(call, new IOException("Canceled!"), finalCallback, id);return;}if (!finalCallback.validateReponse(response, id)){sendFailResultCallback(call, new IOException("request failed , reponse's code is : " + response.code()), finalCallback, id);return;}try{Object o = finalCallback.parseNetworkResponse(response, id);sendSuccessResultCallback(o, finalCallback, id);} catch (Exception e){sendFailResultCallback(call, e, finalCallback, id);}}});}public void sendFailResultCallback(final Call call, final Exception e, final Callback callback, final int id){if (callback == null) return;mPlatform.execute(new Runnable(){@Overridepublic void run(){callback.onError(call, e, id);callback.onAfter(id);}});}public void sendSuccessResultCallback(final Object object, final Callback callback, final int id){if (callback == null) return;mPlatform.execute(new Runnable(){@Overridepublic void run(){callback.onResponse(object, id);callback.onAfter(id);}});}public void cancelTag(Object tag){for (Call call : mOkHttpClient.dispatcher().queuedCalls()){if (tag.equals(call.request().tag())){call.cancel();}}for (Call call : mOkHttpClient.dispatcher().runningCalls()){if (tag.equals(call.request().tag())){call.cancel();}}}public static class METHOD{public static final String HEAD = "HEAD";public static final String DELETE = "DELETE";public static final String PUT = "PUT";public static final String PATCH = "PATCH";}
}

要是没有添加依赖的，去build.gradle添加依赖，没有包的就ALT+ENTER引包。

再说一下这段请求代码，搞过后台的基本都能看懂。

OkHttpUtils.get().url(url).addParams("cuuid","66666").addParams("washDate", dateString).addParams("washTime",timeString).build().execute(new StringCallback() {@Overridepublic void onError(Call call, Exception e, int id) {Log.e("onError:", e.toString());}@Overridepublic void onResponse(String response, int id) {Log.e("onResponse:", response);JSONObject responseJson = (JSONObject) JSONObject.parse(response);String code = responseJson.getString("code");String message = responseJson.getString("message");//保存成功if("100".equals(responseJson.get("code"))){Toast.makeText(getApplicationContext(), code+","+responseJson.get("message"), Toast.LENGTH_LONG).show();}else{Toast.makeText(getApplicationContext(), code+","+responseJson.get("message"), Toast.LENGTH_LONG).show();}}});

发了一个get请求，参数是cuuid，washDate，washTime，这两个时间就是上面从插件

选的。onResponse方法，需要返回标准的json格式，我这里定义的是

{"code":"100","message":"success"}，后台需要的接口，这里不写了。

4.最后一步，打包