content: package com.sqh.market.activity;
  
  import android.content.Context;
  import android.content.Intent;
  import android.content.SharedPreferences;
  import android.database.sqlite.SQLiteDatabase;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  import android.support.v7.app.AppCompatActivity;
  import android.util.Log;
  import android.view.View;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.TextView;
  import android.widget.Toast;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.JSONObject;
  import com.sqh.market.MainActivity;
  import com.sqh.market.R;
  import com.sqh.market.constant.Constants;
  import com.sqh.market.utils.NetUtil;
  
  import java.io.IOException;
  
  import okhttp3.Call;
  import okhttp3.Callback;
  import okhttp3.FormBody;
  import okhttp3.RequestBody;
  import okhttp3.Response;
  
  
  public class LoginActivity extends AppCompatActivity {
      private static final String TAG = "LoginActivity";
      private static final int REQUEST_SIGNUP = 0;
  
      private long exitTime;
      private SQLiteDatabase sqlitedb = null;
      String account = "";
      String password = "";
      String userName = "";
      int userId = 0;
  
  
      //绑定操作
      private EditText _mobile_Text;
      private EditText _passwordText;
      private Button _loginButton;
      private TextView _signupLink;
  
      private void init() {
          _mobile_Text = findViewById(R.id.input_mobile);
          _passwordText = findViewById(R.id.input_password);
          _loginButton = findViewById(R.id.btn_login);
          _signupLink = findViewById(R.id.link_signup);
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_login);
  
          //初始化控件
          init();
  
          //登录按钮点击事件
          _loginButton.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  login();
              }
          });
  
          //注册按钮点击事件
          _signupLink.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  Intent intent = new Intent(getApplicationContext(), SignupActivity.class);
                  startActivityForResult(intent, REQUEST_SIGNUP);
                  finish();
                  overridePendingTransition(R.anim.push_left_in, R.anim.push_left_out);
              }
          });
      }
  
      /**
       * 登录
       */
      public void login() {
          Log.d(TAG, "Login");
  
          account = _mobile_Text.getText().toString();
          password = _passwordText.getText().toString();
          postLoginRequest(account, password);
  
      }
  
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          if (requestCode == REQUEST_SIGNUP) {
              if (resultCode == RESULT_OK) {
                  this.finish();
              }
          }
      }
  
  
      /**
       * 成功登录的情况
       */
      public void onLoginSuccess(String message) {
          Toast.makeText(getBaseContext(), message, Toast.LENGTH_LONG).show();
          _loginButton.setEnabled(true);
          SharedPreferences sharedPreferences = getSharedPreferences("userInfo", Context.MODE_PRIVATE); //私有数据
          //获取SharedPreferences编辑器
          SharedPreferences.Editor editor = sharedPreferences.edit();
          editor.putString("account", account);
          editor.putString("username", userName);
          editor.putString("password", password);
          editor.putInt("userId", userId);
          editor.commit();//提交修改
  
          Intent intent = new Intent(LoginActivity.this, MainActivity.class);
          intent.putExtra("account", account);
          startActivity(intent);
          finish();
      }
  
      /**
       * 登录失败的情况
       */
      public void onLoginFailed(String message) {
          Toast.makeText(getBaseContext(), message, Toast.LENGTH_LONG).show();
          _loginButton.setEnabled(true);
      }
  
      /**
       * 验证方法
       *
       * @return true/false 合法/非法
       */
      public boolean validate() {
          boolean valid = true;
  
          String email = _mobile_Text.getText().toString();
          String password = _passwordText.getText().toString();
  
          if (email.isEmpty()) {
              _mobile_Text.setError("请输入有效账号");
              valid = false;
          } else {
              _mobile_Text.setError(null);
          }
  
          if (password.isEmpty() || password.length() < 4 || password.length() > 10) {
              _passwordText.setError("请输入4-10位的密码");
              valid = false;
          } else {
              _passwordText.setError(null);
          }
  
          return valid;
      }
  
      /**
       * 根据handler结果进行不同操作
       */
      private Handler handler = new Handler() {
          @Override
          public void handleMessage(Message msg) {
              switch (msg.what) {
                  case 1:
                      onLoginSuccess(msg.obj.toString());
                      break;
                  default:
                      onLoginFailed(msg.obj.toString());
                      break;
              }
          }
      };
  
      /**
       * 使用账号密码登录
       *
       * @param account  账号
       * @param password 密码
       */
      private void postLoginRequest(String account, String password) {
  
          //post请求来获得数据
          //创建一个RequestBody，存放重要数据的键值对
  
          //创建一个请求对象，传入URL地址和相关数据的键值对的对象
          RequestBody body = new FormBody.Builder()
                  .add("account", account)
                  .add("password", password).build();
  
          //发送网络请求
          String url = Constants.BASE_URL + Constants.LOGIN_URL;
          NetUtil.doPost(url, body, new Callback() {
              @Override
              public void onFailure(Call call, IOException e) {
                  Message message = Message.obtain();
                  message.what = -1;
                  handler.sendMessage(message);
                  Log.e("登录失败！", e.getMessage());
              }
  
              @Override
              public void onResponse(Call call, Response response) throws IOException {
                  //将服务器响应的参数response.body().string())发送到hanlder中，并更新ui
                  Message message = Message.obtain();
                  try {
                      String jsonStr = response.body().string().trim();
                      JSONObject json = JSON.parseObject(jsonStr);
                      Log.i("response", jsonStr);
                      if (json.getBoolean("flag")) {
                          //拿到userId
                          String[] data = json.getString("data").split(",");
  
                          userId = Integer.parseInt(data[0]);
                          userName = data[1];
  
                          message.what = 1;
                          message.obj = json.getString("message");
                      } else {
                          message.what = 0;
                          message.obj = json.getString("message");
                      }
                  } catch (Exception e) {
                      if (e instanceof NullPointerException) {
                          Log.e("network error!", e.getMessage());
                      }
                      message.what = 0;
                      message.obj = "登陆失败！";
                  }
  
                  handler.sendMessage(message);
              }
          });
      }
  
  }
  