Activity 与 fragment 生命周期

1、fragment生命周期

贴一个自己的Volly

package homepage.yhm.com.voellydemo;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;


/**
 * Created by Administrator on 2016/4/8.
 */
public class MyVolley extends Activity {

    private TextView textView;

    //创建一个handler对象，重写handleMessage
    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            textView.setText(msg.obj.toString());
        }
    };

    //创建一个runnable对象，重写run方法，在run方法中创建StringRequest并传参，将newRequestQueue写入
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            StringRequest stringRequest = new StringRequest(Request.Method.GET, "http://www.baidu.com", rListener, errorListener);
            Volley.newRequestQueue(MyVolley.this).add(stringRequest);
        }


        Response.Listener rListener = new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                Message message = handler.obtainMessage();//不知道是啥，就用它
                message.obj = response;
                message.what = 1;
                handler.sendMessage(message);
                Log.d("aaa", response);
            }
        };

        Response.ErrorListener errorListener = new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Message message = handler.obtainMessage();
                message.obj = error.getMessage();
                message.what = 2;
                handler.sendMessage(message);
            }
        };
    };

    //在textview中写onclick方法，处理handler post。将runnable传入
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        textView = (TextView) findViewById(R.id.start);
        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.post(runnable);
            }
        });
    }
}