package www.wulian1.com.webview;

import android.content.SharedPreferences;
import android.icu.text.IDNA;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import org.json.JSONObject;
import org.xml.sax.ErrorHandler;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;

public class PHPActivity extends AppCompatActivity {

    ListView listView;
    List<StuManage> stuList=null;

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            String abc = (String) msg.obj;
            Toast.makeText(PHPActivity.this, "我输出的字符：" + abc, Toast.LENGTH_SHORT).show();
            switch (msg.what) {
                case 200:
                    //获取到数据
                    //List<StuManage> stuList=(List<StuManage>)msg.obj;
                    if(stuList!=null &&stuList.size()>0) {
                        MyAdapter myAdapter = new MyAdapter(stuList, PHPActivity.this);
                        listView.setAdapter(myAdapter);
                    }
                    else
                    {
                        Toast.makeText(PHPActivity.this,"没有数据",Toast.LENGTH_SHORT).show();
                    }
                    break;
                case 2:
                    //获取失败
                    Toast.makeText(PHPActivity.this,"获取数据失败",Toast.LENGTH_SHORT).show();
                    break;
                case 0:
                    //获取发生异常
                    Toast.makeText(PHPActivity.this,"获取数据异常",Toast.LENGTH_SHORT).show();
                    break;
                default:
                    //其他情况
                    Toast.makeText(PHPActivity.this,"获取数据异常2",Toast.LENGTH_SHORT).show();
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_php);

        listView=(ListView)findViewById(R.id.lv_1);
        SharedPreferences sp=this.getSharedPreferences("WebView",MODE_PRIVATE);
        String dataString=sp.getString("name","");
        if (!"".equals(dataString)){
            Gson gson=new Gson();
            try{
                JSONObject jsonObject=new JSONObject(dataString);
                String timestamp=jsonObject.getString("timestamp");
                StuManage stuManage=gson.fromJson(dataString,StuManage.class);
                Long nowtimestamp=System.currentTimeMillis();
                Long offday=(nowtimestamp - stuManage.getTimestamp())/(1000*60*60*24);
                Log.d("84","offday="+offday);
                if (offday<30){
                    //从缓存中获取数据
                    dataget();
                    Toast.makeText(PHPActivity.this,"未过期",Toast.LENGTH_SHORT).show();
                    Log.d("84","距离上次天数为"+offday);
                }else {
                    getDataFromService();
                    Toast.makeText(PHPActivity.this,"已过期",Toast.LENGTH_SHORT).show();
                    Log.d("84","距离上次天数为"+offday);
                }
            }catch (Exception e){
                e.printStackTrace();
                Toast.makeText(PHPActivity.this,"获取时间异常",Toast.LENGTH_SHORT).show();
                Log.d("84","获取时间异常");
            }
        }else {
            //没拿到数据，重新获取数据
            getDataFromCache();
        }

        Button btn_getstring = (Button) findViewById(R.id.btn_1);
        Button btn_getjson = (Button) findViewById(R.id.btn_2);

        btn_getjson.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (getDataFromCache()) {
                    //拿到数据，绑定数据
                    MyAdapter myAdapter=new MyAdapter(stuList,PHPActivity.this);
                    listView.setAdapter(myAdapter);

                    Log.d("84","cache");
                } else {
                    getDataFromService();
                    Log.d("84","Service");
                }

                //   Toast.makeText(PHPActivity.this,"准备完成",Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void dataget() {
        if (getDataFromCache()){
            MyAdapter myAdapter=new MyAdapter(stuList,PHPActivity.this);
            listView.setAdapter(myAdapter);
        }else {
            getDataFromService();
        }
    }

    public String readInfoStream(InputStream input) throws Exception {
        if (input == null) {
            throw new Exception("输入流为null");
        }
        //字节数组
        byte[] bcache = new byte[2048];
        int readSize = 0;//每次读取的字节长度
        int totalSize = 0;//总字节长度
        ByteArrayOutputStream infoStream = new ByteArrayOutputStream();
        try {
            //一次性读取2048字节
            while ((readSize = input.read(bcache)) > 0) {
                totalSize += readSize;

                //将bcache中读取的input数据写入infoStream
                infoStream.write(bcache, 0, readSize);
            }
        } catch (IOException e1) {
            throw new Exception("输入流读取异常");
        } finally {
            try {
                //输入流关闭
                input.close();
            } catch (IOException e) {
                throw new Exception("输入流关闭异常");
            }
        }

        try {
            return infoStream.toString("utf-8");
        } catch (UnsupportedEncodingException e) {
            throw new Exception("输出异常");
        }
    }

    private boolean getDataFromCache() {
        try {
            SharedPreferences sharedPreferences = PHPActivity.this.getSharedPreferences("WebView", MODE_PRIVATE);
            String data = http://www.mamicode.com/sharedPreferences.getString("data", "");
            //JSONObject jsonObject=new JSONObject(data);
            //String code=jsonObject.get("code").toString();
            if (data != "") {
                // String datas=jsonObject.get("datas").toString();
                Gson gson = new Gson();
                stuList = gson.fromJson(data, new TypeToken<List<StuManage>>() {
                }.getType());
                return true;
            } else {
                stuList = null;
                return false;
            }
        } catch (Exception e) {
            e.printStackTrace();
            stuList = null;
            return false;
        }
    }

    private void getDataFromService() {
        final String path = "http://10.10.192.58:8081/Json/Json.php";
        new Thread() {
            @Override
            public void run() {
                super.run();
                try {
                    URL url = new URL(path);
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.setConnectTimeout(5000);
                    Log.d("84", "try -1");
                    int code = conn.getResponseCode();
                    if (code == 200) {
                        Log.d("84", "code==200");
                        InputStream inputStream = conn.getInputStream();
                        String abc = readInfoStream(inputStream);
                        Gson gson = new Gson();
                        stuList = gson.fromJson(abc, new TypeToken<List<StuManage>>() {
                        }.getType());
                        SharedPreferences sharedPreferences = getSharedPreferences("WebView", MODE_PRIVATE);
                        SharedPreferences.Editor editor = sharedPreferences.edit();
                        editor.putString("studata", abc);

                        //StuManage stuManage=new StuManage();
                        //stuManage.setTimestamp(System.currentTimeMillis());
                        //Gson gson=new Gson();

                        Log.d("84", "stulist 获取数据正常");
                        Message message = new Message();
                        message.obj = abc;
                        message.what = 200;
                        handler.sendMessage(message);
                    } else {
                        Message message = new Message();
                        message.what = 2;
                        handler.sendMessage(message);
                        Log.d("84", "请求失败");
                    }
                } catch (Exception e) {
                    Message message = new Message();
                    message.what = 0;
                    handler.sendMessage(message);
                    Log.d("84", "Exception");
                }
            }
        }.start();
    }
}

PHPActivity.java