【学Android开发总结：垃圾分类APP（三）】

【学Android开发总结：垃圾分类APP（三）】

垃圾分类APP（三）搜索功能的实现

• 搜索界面的布局
• 准备工作
• • 需要垃圾分类查询的接口
  • 加入约束
  • 新建类来使用Okhttp
  • 网络配置
• 处理接口传递过来的数据
• • 浅看一下接收的数据
  • 新建搜索栏放置一种垃圾
  • 新建Garbge包
• 实现查找分类功能
• • 搜索页面布局
  • 搜索的Java代码
• 搜索结果细节界面
• • 布局
  • Java代码
• 参考文章
• 我的其他文章

搜索界面的布局

详情见之前文章！！！

准备工作

需要垃圾分类查询的接口

前往天行数据，注册账号，申请接口

前往个人中心，找到我的密钥，那个就是你用来调用接口的密钥，每人每天可以免费调用接口100次

加入约束

要用到 OKhttp3 所以前往 添加依赖

implementation 'com.squareup.okhttp3:okhttp:4.4.0'
implementation 'com.squareup.okio:okio:2.4.3'

新建类来使用Okhttp

一、新建一个API包来放和api相关的类
二、在API包下新建一个 OkhttpUntils 类

drubish.API;import okhttp3.Callback;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;public class OkhttpUntils {public static void OkHttpPost(String url, String json, Callback callback){OkHttpClient client = new OkHttpClient();RequestBody body = ate(MediaType.parse("application/json;charset=utf-8"),json);Request request = new Request.Builder().url(url).post(body).build();wCall(request).enqueue(callback);}public static void OkHttpGet(String url, Callback callback){OkHttpClient client = new OkHttpClient();Request request = new Request.Builder().url(url).build();wCall(request).enqueue(callback);}
}

三、在API包下新建一个 Okhttp_work 类

drubish.API;import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;public class Okhttp_work {public static void OkHttpGet(String url, Callback callback){OkHttpClient client = new OkHttpClient();Request request = new Request.Builder().url(url).build();wCall(request).enqueue(callback);}
}

网络配置

需要手机的网络等权限，所以前往 添加

<uses-permission android:name="android.permission.INTERNET" /> <!--网络-->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />  
<uses-permission android:name="android.permission.RECORD_AUDIO" />  <!--录音-->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <!--文件读写-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />  <!--相机-->

android:networkSecurityConfig="@xml/network_config"
android:requestLegacyExternalStorage="true"

下面报红了，因为我们还没有建网络配置

在res下新建一个xml文件夹，文件夹下新建 l，里面代码如下：

<?xml version="1.0" encoding="utf-8"?>
<network-security-config><base-config cleartextTrafficPermitted="true" />
</network-security-config>

在xml文件夹下新建一个l，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android=""><external-path name="my_images" path="" />
</paths>

网络配置完成啦！！！

处理接口传递过来的数据

浅看一下接收的数据

新建搜索栏放置一种垃圾

新建一个 l

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""android:layout_width="match_parent"android:layout_height="wrap_content"><TextViewandroid:id="@+id/garbage_name"android:layout_width="245dp"android:layout_height="60dp"android:layout_alignParentTop="true"android:layout_gravity="center_vertical"android:layout_marginTop="0dp"android:gravity="center_vertical"android:textAppearance="@style/TextAppearance.AppCompat.Large"android:textSize="20dp" /><TextViewandroid:id="@+id/garbage_type"android:layout_width="165dp"android:layout_height="60dp"android:layout_alignParentTop="true"android:layout_alignParentEnd="true"android:layout_alignParentRight="true"android:layout_gravity="center_vertical"android:layout_marginTop="0dp"android:layout_marginEnd="-6dp"android:layout_marginRight="-6dp"android:gravity="center"android:textAppearance="@style/TextAppearance.AppCompat.Medium" />
</LinearLayout>

新建Garbge包

一、新建 Grabge_list 类处理接收的数据

drubish.Garbage;drubish.Fragment.SearchFragment;import org.json.JSONException;
import org.json.JSONObject;public class Garbage_list {private JSONObject search_result= SearchFragment.Search_JSON;private String name;private int garbage_type;           //0是可回收，1是有害垃圾，2是厨余垃圾，3是其它垃圾private String[] garbage_type_string={"可回收垃圾","有害垃圾","厨余垃圾","其它垃圾"};public Garbage_list(JSONObject the_garbage_JSON) throws JSONException {name=the_String("name");garbage_type=Integer.parseInt(the_String("type"));}public String getName(){return name;}public String getType(){return garbage_type_string[garbage_type];}
}

二、再建一个垃圾适配器 Garbage_adapter 类

drubish.Garbage;t.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;drubish.R;import java.util.List;public class Garbage_adapter extends ArrayAdapter {private int resourceId;public Garbage_adapter(Context context, int textViewResourceId, List<Garbage_list> objects){super(context,textViewResourceId,objects);resourceId=textViewResourceId;}@Overridepublic View getView(int position, View convertView, ViewGroup parent){Garbage_list garbage_list= (Garbage_list) getItem(position);View view= LayoutInflater.from(getContext()).inflate(resourceId, parent,false);TextView garbageName=(TextView)view.findViewById(R.id.garbage_name);TextView garbageType=(TextView)view.findViewById(R.id.garbage_type);garbageName.setText(Name());garbageType.setText(Type());return view;}
}

实现查找分类功能

一、先到SearchFragment添加要用到的属性

private EditText et_search;
private Button bt_search;
public static JSONObject Search_JSON;
//接口地址加密钥
String url_garbage="=****************************&word=";
//星号位置为你们自己的密钥，把数据换上去就行了

同之前一样在 SearchFragment 中加入下面代码

    public void onActivityCreated(Bundle savedInstanceState) {ActivityCreated(savedInstanceState);et_search = getActivity().findViewById(_search);bt_search = getActivity().findViewById(R.id.bt_search);bt_search.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {intn_search();}});}public void intn_search() {View view = getActivity().getWindow().peekDecorView();if (view != null) {//这里是网络访问的代码，获取服务InputMethodManager inputmanger = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);inputmanger.WindowToken(), 0);}initData_search();}Handler handler_search=new Handler(new Handler.Callback() {//首先通过handler发送信息@Overridepublic boolean handleMessage(@NonNull Message msg) {switch (msg.what){case 0:Toast.makeText(getActivity(),"网络错误",Toast.LENGTH_LONG).show();break;case 1:String json=(String)msg.obj;try{Search_JSON=new JSONObject(json);Intent intent=new Intent();intent.setClass(getActivity(), Search.class);startActivity(intent);		//进行页面跳转break;}catch (JSONException e){e.printStackTrace();}default:throw new IllegalStateException("Unexpected value: " + msg.what);}return false;}});private void initData_search(){String data=Text().toString();if(TextUtils.isEmpty(data)){//如果内容为空，弹出toast消息，不为空则执行164行以后的代码Toast.makeText(getActivity(),"垃圾名称不能为空！",Toast.LENGTH_SHORT).show();}else{Okhttp_work.OkHttpGet(url_garbage+data, new Callback() {@Overridepublic void onFailure(Call call, IOException e) {}@Overridepublic void onResponse(Call call, Response response) throws IOException {String content=response.body().string();Message message=new Message();message.what=1;message.obj=content;handler_search.sendMessageDelayed(message,1000);}});}}

上面页面跳转到另外一个页面，记得创建这个Activity

搜索页面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android=""xmlns:app=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".Search"android:orientation="vertical"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="50sp"android:orientation="horizontal"android:background="#CCCCCC"><EditTextandroid:id="@+id/text_searchb"android:layout_width="wrap_content"android:layout_height="40sp"android:layout_weight="6"android:background="#FFFFFF"android:layout_gravity="center"android:textSize="25sp"/><Buttonandroid:id="@+id/btn_searchb"android:layout_width="wrap_content"android:layout_height="50sp"android:layout_weight="1"android:layout_gravity="center"android:text="搜索"android:textSize="20sp"/></LinearLayout><ListViewandroid:id="@+id/search_listview"android:layout_width="match_parent"android:layout_height="match_parent"/>
</LinearLayout>

效果如下

搜索的Java代码

类似上面，搬代码过来就行
一、先加要用到的属性

private ListView garbageList_View;
public static int garbage_id;private JSONObject search_result= SearchFragment.Search_JSON;      //用于接收MainActivity中的搜索结果
private List<Garbage_list> garbageList=new ArrayList<>();private EditText text_search;
private Button btn_search;
String url_garbage="=***************************&word=";

    protected void onCreate(Bundle savedInstanceState) {Create(savedInstanceState);setContentView(R.layout.activity_search);ActionBar actionbar=getSupportActionBar();if(actionbar!=null){actionbar.hide();}text_search = findViewById(_searchb);btn_search = findViewById(R.id.btn_searchb);try {init_garbage_list();} catch (JSONException e) {e.printStackTrace();}Garbage_adapter adapter=new Garbage_adapter(Search.this, R.layout.garbage_item, garbageList);ListView listView=findViewById(R.id.search_listview);listView.setAdapter(adapter);btn_search.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {init_search();}});garbageList_View=findViewById(R.id.search_listview);garbageList_View.setOnItemClickListener(new AdapterView.OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {garbage_id=i;Intent intent=new Intent();//跳转到细节页面intent.setClass(Search.this, DetailActivity.class);startActivity(intent);}});}private JSONObject make_the_JSON(int i) throws JSONException {            //用于将JSON转换为字符串数组JSONArray newslist=JSONArray("newslist");String[] name=new String[newslist.length()];String newslistString=new String();JSONObject the_garbage_JSON = new JSONObject();       //具体某一项的json ，可以通过getstring获得其中具体的项newslistString&#String(i);the_garbage_JSON=new JSONObject(newslistString);
//        name[i]=the_String("name");return the_garbage_JSON;}private void init_garbage_list() throws JSONException {JSONArray newslist=JSONArray("newslist");for(int i=0;i<newslist.length();i++){Garbage_list the_garbage=new Garbage_list(make_the_JSON(i));garbageList.add(the_garbage);}}public void init_search() {View view = getWindow().peekDecorView();if (view != null) {//这里是网络访问的代码，获取服务InputMethodManager inputmanger = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);inputmanger.WindowToken(), 0);}initData_search();}Handler handler_search=new Handler(new Handler.Callback() {//首先通过handler发送信息@Overridepublic boolean handleMessage(@NonNull Message msg) {switch (msg.what){case 0:Toast.makeText(Search.this,"网络错误",Toast.LENGTH_LONG).show();break;case 1:String json=(String)msg.obj;try{SearchFragment.Search_JSON=new JSONObject(json);Intent intent=new Intent();intent.setClass(Search.this, Search.class);startActivity(intent);		//进行页面跳转finish();break;}catch (JSONException e){e.printStackTrace();}default:throw new IllegalStateException("Unexpected value: " + msg.what);}return false;}});private void initData_search(){String data=Text().toString();if(TextUtils.isEmpty(data)){//如果内容为空，弹出toast消息，不为空则执行164行以后的代码Toast.makeText(Search.this,"垃圾名称不能为空！",Toast.LENGTH_SHORT).show();}else{Okhttp_work.OkHttpGet(url_garbage+data, new Callback() {@Overridepublic void onFailure(Call call, IOException e) {}@Overridepublic void onResponse(Call call, Response response) throws IOException {String content=response.body().string();Message message=new Message();message.what=1;message.obj=content;handler_search.sendMessageDelayed(message,1000);}});}}

搜索结果细节界面

布局

<?xml version="1.0" encoding="utf-8"?>
&straintlayout.widget.ConstraintLayout xmlns:android=""xmlns:app=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".Detail"><TextViewandroid:id="@+id/detail_garbage_name"android:layout_width="198dp"android:layout_height="203dp"android:gravity="center"android:text="无网络连接~"android:textColor="@color/black"android:textSize="25sp"android:textStyle="italic|bold"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="0.075"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.03" /><TextViewandroid:id="@+id/detail_garbage_type"android:layout_width="173dp"android:layout_height="124dp"android:gravity="center"android:text="无网络连接~"android:textColor="@color/black"android:textSize="18sp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="0.105"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.202" /><TextViewandroid:id="@+id/detail_garbage_explain"android:layout_width="379dp"android:layout_height="123dp"android:layout_alignParentStart="true"android:layout_alignParentLeft="true"android:text="暂时没有网络连接~"android:textColor="@color/black"android:textSize="18sp"android:textStyle="bold"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.43" /><TextViewandroid:id="@+id/detail_garbage_contain"android:layout_width="379dp"android:layout_height="148dp"android:layout_alignParentStart="true"android:layout_alignParentLeft="true"android:text="暂时没有网络连接~"android:textColor="@color/black"android:textSize="18sp"android:textStyle="bold"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.691" /><TextViewandroid:id="@+id/detail_garbage_tips"android:layout_width="379dp"android:layout_height="147dp"android:layout_alignParentEnd="true"android:layout_alignParentRight="true"android:text="暂时没有网络连接~"android:textColor="@color/black"android:textSize="18sp"android:textStyle="bold"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.914" /><ImageViewandroid:id="@+id/detail_garbage_picture"android:layout_width="176dp"android:layout_height="169dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="0.931"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.08" /></straintlayout.widget.ConstraintLayout>

随便试试，效果如下，很简陋，后面再来优化吧，没什么艺术细胞！！！

Java代码

    private TextView garbage_name;private TextView garbage_type;private TextView garbage_explain;private TextView garbage_contain;private TextView garbage_tips;private ImageView garbage_picture;private JSONObject search_result=MainActivity.Search_JSON;private int detail_garbage_id=SearchActivity.garbage_id;private String[] garbage_type_string={"可回收垃圾","有害垃圾","厨余垃圾","其它垃圾"};@Overrideprotected void onCreate(Bundle savedInstanceState) {Create(savedInstanceState);setContentView(R.layout.activity_detail);ActionBar actionbar=getSupportActionBar();if(actionbar!=null){actionbar.hide();}garbage_name=findViewById(R.id.detail_garbage_name);garbage_type=findViewById(R.id.detail_garbage_type);garbage_explain=findViewById(R.id.detail_garbage_explain);garbage_contain=findViewById(R.id.detail_garbage_contain);garbage_tips=findViewById(R.id.detail_garbage_tips);garbage_picture=findViewById(R.id.detail_garbage_picture);try {garbage_name.setText(make_the_String("name"));} catch (JSONException e) {e.printStackTrace();}try {String s = garbage_type_string[Integer.parseInt(make_the_String("type"))];//这是在插入图片，可以在网上找到自己想要的图片switch (s){case "可回收垃圾":garbage_picture.setBackgroundDrawable(getResources().getDrawable(lablewast));break;case "有害垃圾":garbage_picture.setBackgroundDrawable(getResources().getDrawable(R.drawable.harmfulwaste));break;case "厨余垃圾":garbage_picture.setBackgroundDrawable(getResources().getDrawable(R.drawable.kitchenwaste));break;case "其它垃圾":garbage_picture.setBackgroundDrawable(getResources().getDrawable(herwaste));break;}garbage_type.setText(garbage_type_string[Integer.parseInt(make_the_String("type"))]);} catch (JSONException e) {e.printStackTrace();}try {garbage_explain.setText("    "+make_the_String("explain"));} catch (JSONException e) {e.printStackTrace();}try {garbage_contain.setText("    "+make_the_String("contain"));} catch (JSONException e) {e.printStackTrace();}try {garbage_tips.setText("    小贴士："+make_the_String("tip"));} catch (JSONException e) {e.printStackTrace();}}private String make_the_String(String need) throws JSONException {            //用于将JSON转换为字符串数组JSONArray newslist=JSONArray("newslist");
//        String[] name=new String[newslist.length()];String newslistString=new String();JSONObject the_garbage_JSON=new JSONObject();       //具体某一项的json ，可以通过getstring获得其中具体的项newslistString&#String(detail_garbage_id);the_garbage_JSON=new JSONObject(newslistString);
//        name[i]=the_String("name");return the_String(need);}

好了，搜索功能也完事了，差个新闻功能可能也挺费脑子，其实这些都是我已经自己弄好的了，新闻还没成功搞好，拖更了，什么时候实验成功了再回来写。

参考文章

我可以也是学了别人的文章来弄的呀，你们也可以看看别人的文章

Android 垃圾分类APP（一）申请API、搭建项目、访问接口获取数据

从零开始用Andrid Studio开发一个简单的垃圾分类查询APP（3）

我的其他文章

垃圾分类APP（一）

垃圾分类APP（二）

垃圾分类APP（三）

垃圾分类 APP（四）

垃圾分类APP（五）