Android开发-Fragment之间传值-2-AndroidStudio
修改了之前博客中MainActivity，直接实例化3个Fragment，然后进行隐藏和显示，通过MyData的position。
我们来看下具体代码：
AndroidManiFest.xml:
xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.iwanghang.fragmenttransactiondemo">
android:name="android.permission.INTERNET" />
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
android:name=".MainActivity"
android:screenOrientation="portrait">
android:name="android.intent.action.MAIN" />
android:name="android.intent.category.LAUNCHER" />
MainActivity.java:
package com.iwanghang.fragmenttransactiondemo; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.View; import android.view.View.OnClickListener; import android.widget.LinearLayout; /** * 实现OnItemClickListener(Item点击事件监听),OnClickListener(按钮点击事件监听) * 刷新 * 个推 * Volley:第三方插件 主要用于post、get解析 */ public class MainActivity extends FragmentActivity implements OnClickListener{ private LinearLayout oneLinearLayout; private LinearLayout twoLinearLayout; private LinearLayout threeLinearLayout; private OneFragment oneFragment; private TwoFragment twoFragment; private ThreeFragment threeFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initFragment(); showOneFragment(); } private void initView() { oneLinearLayout = (LinearLayout)this.findViewById(R.id.oneLinearLayout); twoLinearLayout = (LinearLayout)this.findViewById(R.id.twoLinearLayout); threeLinearLayout = (LinearLayout)this.findViewById(R.id.threeLinearLayout); oneLinearLayout.setOnClickListener(this); twoLinearLayout.setOnClickListener(this); threeLinearLayout.setOnClickListener(this); } private void initFragment() { //从 FragmentManager 获得一个FragmentTransaction的实例 : FragmentManager fragmentManager = getSupportFragmentManager(); //FragmentTransaction对fragment进行添加,移除,替换,以及执行其他动作。 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); //每一个事务都是同时要执行的一套变化.可以在一个给定的事务中设置你想执行的所有变化, // 使用诸如 add(), remove(), 和 replace().然后, 要给activity应用事务, 必须调用 commit(). oneFragment = new OneFragment(); twoFragment = new TwoFragment(); threeFragment = new ThreeFragment(); //将Fragment two设置成Fragment one的目标 Fragment 然后Fragment two就可以接收Fragment one发送的消息了 oneFragment.setTargetFragment(twoFragment, OneFragment.requestCode); //将Fragment one设置成Fragment two的目标 Fragment 然后Fragment one就可以接收Fragment two发送的消息了 twoFragment.setTargetFragment(oneFragment, TwoFragment.requestCode); //这样Fragment one和 Fragment two就能够实现互相通信了 fragmentTransaction.add(R.id.oneFragment_container, oneFragment); fragmentTransaction.add(R.id.twoFragment_container,twoFragment); fragmentTransaction.add(R.id.threeFragment_container,threeFragment); fragmentTransaction.hide(twoFragment); // 隐藏twoFragment fragmentTransaction.hide(threeFragment); // 隐藏threeFragment //一定要记得提交 fragmentTransaction.commit(); } @Override public void onClick(View arg0) { switch (arg0.getId()) { case R.id.oneLinearLayout: showOneFragment(); break; case R.id.twoLinearLayout: showTwoFragment(); break; case R.id.threeLinearLayout: showThreeFragment(); break; default: break; } } /** * 切换到OneFragment */ public void showOneFragment() { FragmentManager fragmentManager = getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.show(oneFragment); fragmentTransaction.hide(twoFragment); fragmentTransaction.hide(threeFragment); //一定要记得提交 fragmentTransaction.commit(); } /** * 切换到TwoFragment */ public void showTwoFragment() { FragmentManager fragmentManager = getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.hide(oneFragment); fragmentTransaction.show(twoFragment); fragmentTransaction.hide(threeFragment); //一定要记得提交 fragmentTransaction.commit(); } /** * 切换到ThreeFragment */ public void showThreeFragment() { FragmentManager fragmentManager = getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.hide(oneFragment); fragmentTransaction.hide(twoFragment); fragmentTransaction.show(threeFragment); //一定要记得提交 fragmentTransaction.commit(); } }
MyData.java:
package com.iwanghang.fragmenttransactiondemo; import java.io.Serializable; public class MyData implements Serializable { public int position; public int getPosition() { return position; } public void setPosition(int position) { this.position = position; } }
OneFragment.java:
package com.iwanghang.fragmenttransactiondemo; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.List; /** * 实现OnItemClickListener(Item点击事件监听),OnClickListener(按钮点击事件监听) */ public class OneFragment extends Fragment implements OnItemClickListener { /** * item */ private ListView listViewTask; private ListTwoFragment.java:list; private LayoutInflater inflater; private TaskAdapter taskAdapter; /** * MainActivity */ private MainActivity mainActivity; /** * Json */ private String title; private Volley4Json volley4Json; /** * 传值 */ public static int requestCode = 0; public static String key = "OneFragment.key"; //onAttach(),当fragment被绑定到activity时被调用(Activity会被传入.). @Override public void onAttach(Context context) { super.onAttach(context); mainActivity = (MainActivity) context; } //onCreateView(),创建和fragment关联的view hierarchy时调用. @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { /** * 实例化volley4Json */ volley4Json = new Volley4Json(mainActivity); /** * UI组件初始化 */ View view = inflater.inflate(R.layout.fragment_one,null); /** * item初始化 */ listViewTask = (ListView) view.findViewById(R.id.listViewTask); /** * 解析Json */ list = new ArrayList (); volley4Json.getJsonResult(new Volley4Json.VolleyCallBack() { @Override public void onSuccess(JSONObject result) { /** * 解析Json中的标题 并设置到 list */ try { JSONArray jsonArray = result.getJSONArray("data"); for (int i = 0; i < jsonArray.length(); i++) { JSONObject obj2 = jsonArray.getJSONObject(i); Log.e("TAG", obj2.getString("title")); title = obj2.getString("title"); list.add(i + " . " + title); } taskAdapter = new TaskAdapter(); listViewTask.setAdapter(taskAdapter); } catch (JSONException e) { e.printStackTrace(); } } }); /** * Item点击事件监听 */ listViewTask.setOnItemClickListener(this); return view; } @Override public void onItemClick(AdapterView parent, View view, int position, long id) { MyData data = new MyData(); data.setPosition(position); Intent intent = new Intent(); intent.putExtra(key, data); //用于发送消息给Fragment two getTargetFragment().onActivityResult(requestCode, Activity.RESULT_OK, intent); mainActivity.showTwoFragment(); } public class TaskAdapter extends BaseAdapter { public TaskAdapter() { super(); inflater = LayoutInflater.from(mainActivity); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = convertView; if (view == null) { view = inflater.inflate(R.layout.item_task_list, parent, false); ViewHolder viewHolder = new ViewHolder(); viewHolder.content = (TextView) view.findViewById(R.id.textView_task); view.setTag(viewHolder); } ViewHolder viewHolder = (ViewHolder) view.getTag(); viewHolder.content.setText(list.get(position)); return view; } } private class ViewHolder { private TextView content; } }
package com.iwanghang.fragmenttransactiondemo; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; /* * 用于实现Fragment通信的例子 * 定义了一个TextView用来显示Fragment one发过来的信息 * 定义了一个EditText用力啊输入发送给Fragment one的内容 * 定义了一个Button用来触发发送消息的事件 * 定义了一个MyData 序列化对象用来存储数据 * */ public class TwoFragment extends Fragment { private View view; private int position; private TextView twoFragmentText; public static int requestCode = 1; public static String key = "TwoFragment.key"; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { System.out.println("TwoFragment onCreateView"); view = inflater.inflate(R.layout.fragment_two, container,false); return view; } //该方法用来接收 Fragment one发送过来的消息 @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if( resultCode != Activity.RESULT_OK) return ; if( requestCode == OneFragment.requestCode) { MyData mydata = (MyData) data.getSerializableExtra(OneFragment.key); System.out.println("TwoFragment mydata = " + mydata.toString()); String positionString = String.valueOf(mydata.getPosition()); System.out.println("TwoFragment positionString = " + positionString); twoFragmentText = (TextView) view.findViewById(R.id.twoFragmentText); twoFragmentText.setText(positionString); } } }ThreeFragment.java:
package com.iwanghang.fragmenttransactiondemo; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class ThreeFragment extends Fragment { private View rootView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if(container==null) return null; rootView = inflater.inflate(R.layout.fragment_three, container,false); return rootView; } }Volley4Json.java:
package com.iwanghang.fragmenttransactiondemo; import android.content.Context; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.JsonObjectRequest; import com.android.volley.toolbox.Volley; import org.json.JSONObject; public class Volley4Json { public static Context context; public Volley4Json(Context context){ this.context = context; } /** * 获取Json */ public static void getJsonResult(final VolleyCallBack volleyCallBack) { // 初始化一个请求队列 RequestQueue requestQueue = Volley.newRequestQueue(context); // json串: http://www.ytiantuan.com//api.php/index/index.html String jsonUrl = "http://api.zsreader.com/v2/pub/channel/list?&page=1&tp=1&size=20"; // 根据给定的URL新建一个请求 JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, jsonUrl, null, new Response.Listener() { @Override public void onResponse(JSONObject response) { // 在这里操作UI组件是安全的，因为响应返回时这个函数会被post到UI线程来执行 // 在这里尽情蹂躏响应的response。 volleyCallBack.onSuccess(response); //成功的回调 //System.out.println("成功返回:"+ response.toString()); } }, new Response.ErrorListener(){ @Override public void onErrorResponse(VolleyError error) { // 出错了怎么办？凉拌！并且在这里拌。 System.out.println("发生了一个错误！"); error.printStackTrace(); } }); // 把这个请求加入请求队列 requestQueue.add(jsonObjectRequest); } /** * VolleyCallback */ public interface VolleyCallBack{ void onSuccess(JSONObject result); } }