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AsyncTask+HttpClient

程序员文章站 2022-06-24 22:26:02
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MainActivity主方法

import android.annotation.SuppressLint;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import java.util.concurrent.Executor;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.http.util.EntityUtilsHC4;

public class DemoActivity extends AppCompatActivity {

  private ListView mLVContents;
  private DemoAdapter mAdapter;
  private @SuppressLint("StaticFieldLeak") AsyncTask<String, Integer, List<List<String>>> result;

  @Override protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_demo);

    mLVContents = findViewById(R.id.lv_contents);
    mAdapter = new DemoAdapter(this);
    mLVContents.setAdapter(mAdapter);

    findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
      @Override public void onClick(View v) {
        //网络判断
        if (!NetUtil.hasNetwork(DemoActivity.this)) {
          showNotNetworkDialog();
          return;
        }

        //查询数据
        initData();
      }
    });

    mLVContents.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        List<String> data = mAdapter.getItem(position);
        Toast.makeText(DemoActivity.this, data.get(0) + ":" + data.get(1), Toast.LENGTH_LONG)
            .show();
      }
    });
  }

  private void showNotNetworkDialog() {
    new AlertDialog.Builder(this)
        .setTitle("没有可用网络")
        .setMessage("当前网络不可用，是否去设置")
        .setPositiveButton("确认", new DialogInterface.OnClickListener() {
          @Override public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
            Toast.makeText(DemoActivity.this, "去设置", Toast.LENGTH_LONG).show();
          }
        })
        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
          @Override public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
          }
        })
        .show();
  }

  String urlStr = "https://suggest.taobao.com/sug?code=utf-8&q=%E6%89%8B%E6%9C%BA";

  private final int REQUEST_DATA_SUCCESS = 1;//请求数据成功
  private final int SERA_DATA_SUCCESS = 2;//序列化(解析)数据成功

  @SuppressLint("StaticFieldLeak") private void initData() {
    //client
    //请求对象
    //构造模式
    //链式调用
    //执行请求
    //结果
    result = new AsyncTask<String, Integer, List<List<String>>>() {
      @Override protected List<List<String>> doInBackground(String... strings) {

        //网络请求数据           发布进度

        //将String信息解析成Bean     发布发布进度

        try {
          //client
          HttpClient client = HttpClients.createDefault();
          //请求对象
          //构造模式
          HttpUriRequest request = RequestBuilder
              .get()
              .setUri(strings[0])
              .build();
          //链式调用

          //执行请求
          HttpResponse response = client.execute(request);
          //结果
          if (response.getStatusLine().getStatusCode() == 200) {
            String result = EntityUtils.toString(response.getEntity());
            //后台操作过程中，发布进度。
            //会导致onProgressUpdate调用
            publishProgress(REQUEST_DATA_SUCCESS);

            //gson使用反射解析Bean
            Bean bean = new Gson().fromJson(result, Bean.class);
            publishProgress(SERA_DATA_SUCCESS);

            return bean.getResult();
          }
        } catch (IOException e) {
          e.printStackTrace();
        }
        return null;
      }

      //后台工作进度
      @Override protected void onProgressUpdate(Integer... values) {
        //if(values[0] == REQUEST_DATA_SUCCESS) {
        //  "请求数据成功";
        //} else {
        //  "解析数据成功";
        //}
        Toast.makeText(DemoActivity.this,
            values[0] == REQUEST_DATA_SUCCESS ?"请求数据成功":"解析数据成功",
            Toast.LENGTH_SHORT).show();
      }

      @Override protected void onPostExecute(List<List<String>> s) {
        mAdapter.setmDatas(s);
      }
    }.execute(urlStr);
  }

  private String stream2String(InputStream inputStream) throws IOException {
    StringBuilder sb = new StringBuilder();

    BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
    for (String tmp = br.readLine(); tmp != null; tmp = br.readLine()) {
      sb.append(tmp);
    }

    return sb.toString();
  }
}

MyAdapter适配器

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;

public class DemoAdapter extends BaseAdapter {
  private List<List<String>> mDatas;
  private Context mContext;

  public DemoAdapter(Context context) {
    this.mContext = context;
    //初始化 为什么在这里写
    mDatas = new ArrayList<>();
  }

  //外部调用 更新数据
  public void setmDatas(List<List<String>> mDatas) {
    this.mDatas = mDatas;
    notifyDataSetChanged();
  }

  @Override public int getCount() {
    return mDatas.size();
  }

  @Override public List<String> getItem(int position) {
    List<String> item = mDatas.get(position);
    //return item.get(0);
    //return mDatas.get(position).get(0);
    return item;
  }

  @Override public long getItemId(int position) {
    return position;
  }

  //parent = ListView
  @Override public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder vh;
    //复用，不重复创建View
    if(convertView == null) {
      //convertView = View.inflate(mContext, R.layout.item, null);
      convertView = LayoutInflater.from(mContext).inflate(R.layout.item, parent, false);
      vh = new ViewHolder();
      vh.mIcon = convertView.findViewById(R.id.iv_icon);
      vh.mText = convertView.findViewById(R.id.tv_text);
      convertView.setTag(vh);
    } else {
      vh = (ViewHolder) convertView.getTag();
    }

    //TODO 设置图片

    //设置 数据
    //vh.mText.setText(getItem(position));
    vh.mText.setText(getItem(position).get(0));

    return convertView;
  }

  class ViewHolder {
    private ImageView mIcon;
    private TextView mText;
  }
}

Bean

import java.util.List;
public class Bean {
  public List<List<String>> result;
  public List<List<String>> getResult() {
    return result;
  }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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=".MainActivity"
    >

  <Button
      android:id="@+id/button"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintTop_toTopOf="parent"
      android:text="获取数据"
      />

  <ListView
      android:id="@+id/lv_contents"
      android:layout_width="0dp"
      android:layout_height="0dp"
      app:layout_constraintBottom_toBottomOf="parent"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintTop_toBottomOf="@id/button"
      />

</android.support.constraint.ConstraintLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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=".MainActivity"
    >

  <Button
      android:id="@+id/button"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintTop_toTopOf="parent"
      android:text="获取数据"
      />

  <ListView
      android:id="@+id/lv_contents"
      android:layout_width="0dp"
      android:layout_height="0dp"
      app:layout_constraintBottom_toBottomOf="parent"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintTop_toBottomOf="@id/button"
      />

</android.support.constraint.ConstraintLayout>

NetUtil.java判断工具类

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetUtil {

  //是否有可用的网络
  public static boolean hasNetwork(Context context) {
    ConnectivityManager cm =
        (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();

    //有网络设备 且设备可用
    return activeNetworkInfo != null && activeNetworkInfo.isAvailable();
  }

  //判断是否是手机网络
  public static boolean isMobileNetwork(Context context) {
    //连接管理服务
    ConnectivityManager cm =
        (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    //获取到当前默认可用网络信息
    NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();

    //有网络设备 且 网络设备是手机网络
    return activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE;
  }
}
相关标签： HttpClient

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