如何将数据从Mysql数据库加载到Android列表视图

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我创建了php + mysql数据库服务器，创建了一个包含四个字段（id，name，info，img）的数据库，这四个字段是文本类型，我将此数据转换为json url ：http://giclub.esy.es/show.php现在我想这个JSON网址加载到其中包含三个文本视图和图像视图我的列表视图这是我的代码，但是当我运行在logcat的如何将数据从Mysql数据库加载到Android列表视图

public class ByCategoryMenu extends Activity { 
    RequestQueue requestQueue; 
    String url = "http://giclub.esy.es/show.php"; 
    TextView textView; 
    ListView listView; 
    ArrayList<listitme> listitmes = new ArrayList<listitme>(); 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.bycategorydetails); 

     textView = (TextView) findViewById(R.id.textView); 
     listView = (ListView) findViewById(R.id.listView); 

     requestQueue = Volley.newRequestQueue(this); 
     JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, 
       new Response.Listener<JSONObject>() { 
        @Override 
        public void onResponse(JSONObject response) { 

         try { 
       JSONArray jsonArray = response.getJSONArray("allstudents"); 
          for (int i = 0; i < jsonArray.length(); i++) { 
         JSONObject respons = jsonArray.getJSONObject(i); 
           String id = respons.getString("id"); 
           String name = respons.getString("name"); 
           String info = respons.getString("info"); 
           String img = respons.getString("img"); 
         listitmes.add(new listitme(id, name, info, img)); 
           listAllItme(); 
          } 
         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("VOLLEY", "ERROR"); 
      } 
     } 

     ); 
     requestQueue.add(jsonObjectRequest); 
    } 

    public void listAllItme() { 
     listAdpter lA = new listAdpter(listitmes); 
     listView.setAdapter(lA); 
    } 

    class listAdpter extends BaseAdapter { 
     ArrayList<listitme> listA = new ArrayList<listitme>(); 
     public listAdpter(ArrayList<listitme> listA) { 
      this.listA = listA; 
     } 
     @Override 
     public int getCount() { 
      return listA.size(); 
     } 
     @Override 
     public Object getItem(int position) { 
      return listA.get(position).id; 
     } 

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

     @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
      LayoutInflater layoutInflater = getLayoutInflater(); 
      View view = layoutInflater.inflate(R.layout.row_itm, null); 
      TextView id = (TextView) view.findViewById(R.id.textView_id); 
      TextView name = (TextView) view.findViewById(R.id.textView_name); 
      TextView info = (TextView) view.findViewById(R.id.textView_info); 
      ImageView img = (ImageView) view.findViewById(R.id.imageView); 
      id.setText(listA.get(position).id); 
      name.setText(listA.get(position).name); 
      info.setText(listA.get(position).info);    Picasso.with(ByCategoryMenu.this).load("http://giclub.esy.es/image/" + listA.get(position).img).into(img); 
      return view; 
     } 
    } 
}

得到白色页与此消息，我创建listitem class

public class listitme { 
    public String id; 
    public String name; 
    public String info; 
    public String img; 
    public listitme(String id, String name, String info, String img) { 
     this.id = id; 
     this.name = name; 
     this.info = info; 
     this.img = img; 
    } 
}

row_itm.xml

<TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceSmall" 
     android:text="Small Text" 
     android:id="@+id/textView_id" 
     android:textColor="#fa0000" /> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="Large Text" 
     android:id="@+id/textView_name" 
     android:textColor="@color/accent_material_light" /> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:text="Medium Text" 
     android:id="@+id/textView_info" /> 
    <ImageView 
     android:layout_width="200dp" 
     android:layout_height="200dp" 
     />

bycategorydetalis.xml

<ListView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/listView"/>

show.php

<?php 
    include("config.php"); 
    header('Content-Type: application/json; charset=utf-8'); 
    $result = mysqli_query($db, 'SELECT * FROM student'); 
    $stu = array(); 
    while ($row = mysqli_fetch_array($result)) { 
     array_push($stu,$row); 
    } 
echo "{allstudents : ".json_encode($stu); 
?>

logcat的是

D/dalvikvm: create interp thread : stack size=128KB 
D/dalvikvm: create new thread 
D/dalvikvm: new thread created 
D/dalvikvm: update thread list 
D/dalvikvm: threadid=20: interp stack at 0x626bf000 
D/dalvikvm: threadid=20: created from interp 
D/dalvikvm: start new thread 
D/dalvikvm: threadid=20: notify debugger 
D/dalvikvm: threadid=20 (Picasso-refQueue): calling run() 
D/AndroidRuntime: Shutting down VM 
W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41d2dcf8) 
W/dalvikvm: threadid=1: uncaught exception occurred 
W/System.err: java.lang.IllegalArgumentException: Target must not be null. 
W/System.err:  at com.squareup.picasso.RequestCreator.into(RequestCreator.java:618) 
W/System.err:  at com.squareup.picasso.RequestCreator.into(RequestCreator.java:601) 
W/System.err:  at com.example.amr.fujeraapp.ByCategoryMenu$listAdpter.getView(ByCategoryMenu.java:136) 
W/System.err:  at android.widget.AbsListView.obtainView(AbsListView.java:2338) 
W/System.err:  at android.widget.ListView.makeAndAddView(ListView.java:1812) 
W/System.err:  at android.widget.ListView.fillDown(ListView.java:698) 
W/System.err:  at android.widget.ListView.fillFromTop(ListView.java:759) 
W/System.err:  at android.widget.ListView.layoutChildren(ListView.java:1645) 
W/System.err:  at android.widget.AbsListView.onLayout(AbsListView.java:2149) 
W/System.err:  at android.view.View.layout(View.java:15125) 
W/System.err:  at android.view.ViewGroup.layout(ViewGroup.java:4862) 
W/System.err:  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888) 
W/System.err:  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742) 
W/System.err:  at android.widget.LinearLayout.onLayout(LinearLayout.java:1651) 
W/System.err:  at android.view.View.layout(View.java:15125) 
W/System.err:  at android.view.ViewGroup.layout(ViewGroup.java:4862) 
W/System.err:  at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515) 
W/System.err:  at android.widget.FrameLayout.onLayout(FrameLayout.java:450) 
W/System.err:  at android.view.View.layout(View.java:15125) 
W/System.err:  at android.view.ViewGroup.layout(ViewGroup.java:4862) 
W/System.err:  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888) 
W/System.err:  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742) 
W/System.err:  at android.widget.LinearLayout.onLayout(LinearLayout.java:1651) 
W/System.err:  at android.view.View.layout(View.java:15125) 
W/System.err:  at android.view.ViewGroup.layout(ViewGroup.java:4862) 
W/System.err:  at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515) 
W/System.err:  at android.widget.FrameLayout.onLayout(FrameLayout.java:450) 
W/System.err:  at android.view.View.layout(View.java:15125) 
W/System.err:  at android.view.ViewGroup.layout(ViewGroup.java:4862) 
W/System.err:  at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2317) 
W/System.err:  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2023) 
W/System.err:  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189) 
W/System.err:  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223) 
W/System.err:  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788) 
W/System.err:  at android.view.Choreographer.doCallbacks(Choreographer.java:591) 
W/System.err:  at android.view.Choreographer.doFrame(Choreographer.java:560) 
W/System.err:  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774) 
W/System.err:  at android.os.Handler.handleCallback(Handler.java:808) 
W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:103) 
W/System.err:  at android.os.Looper.loop(Looper.java:193) 
W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:5333) 
W/System.err:  at java.lang.reflect.Method.invokeNative(Native Method) 
W/System.err:  at java.lang.reflect.Method.invoke(Method.java:515) 
W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828) 
W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644) 
W/System.err:  at dalvik.system.NativeStart.main(Native Method) 
W/dalvikvm: threadid=1: calling UncaughtExceptionHandler 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.amr.fujeraapp, PID: 13372 
        java.lang.IllegalArgumentException: Target must not be null. 
         at com.squareup.picasso.RequestCreator.into(RequestCreator.java:618) 
         at com.squareup.picasso.RequestCreator.into(RequestCreator.java:601) 
         at com.example.amr.fujeraapp.ByCategoryMenu$listAdpter.getView(ByCategoryMenu.java:136) 
         at android.widget.AbsListView.obtainView(AbsListView.java:2338) 
         at android.widget.ListView.makeAndAddView(ListView.java:1812) 
         at android.widget.ListView.fillDown(ListView.java:698) 
         at android.widget.ListView.fillFromTop(ListView.java:759) 
         at android.widget.ListView.layoutChildren(ListView.java:1645) 
         at android.widget.AbsListView.onLayout(AbsListView.java:2149) 
         at android.view.View.layout(View.java:15125) 
         at android.view.ViewGroup.layout(ViewGroup.java:4862) 
         at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888) 
         at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742) 
         at android.widget.LinearLayout.onLayout(LinearLayout.java:1651) 
         at android.view.View.layout(View.java:15125) 
         at android.view.ViewGroup.layout(ViewGroup.java:4862) 
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515) 
         at android.widget.FrameLayout.onLayout(FrameLayout.java:450) 
         at android.view.View.layout(View.java:15125) 
         at android.view.ViewGroup.layout(ViewGroup.java:4862) 
         at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888) 
         at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742) 
         at android.widget.LinearLayout.onLayout(LinearLayout.java:1651) 
         at android.view.View.layout(View.java:15125) 
         at android.view.ViewGroup.layout(ViewGroup.java:4862) 
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515) 
         at android.widget.FrameLayout.onLayout(FrameLayout.java:450) 
         at android.view.View.layout(View.java:15125) 
         at android.view.ViewGroup.layout(ViewGroup.java:4862) 
         at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2317) 
         at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2023) 
         at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189) 
         at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223) 
         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788) 
         at android.view.Choreographer.doCallbacks(Choreographer.java:591) 
         at android.view.Choreographer.doFrame(Choreographer.java:560) 
         at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774) 
         at android.os.Handler.handleCallback(Handler.java:808) 
         at android.os.Handler.dispatchMessage(Handler.java:103) 
         at android.os.Looper.loop(Looper.java:193) 
         at android.app.ActivityThread.main(ActivityThread.java:5333) 
         at java.lang.reflect.Method.invokeNative(Native Method) 
         at java.lang.reflect.Method.invoke(Method.java:515) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644) 
         at dalvik.system.NativeStart.main(Native Method)

在这个问题上的任何帮助吗？

来源

2017-02-13 Amr Kamal

'回波json_encode（阵列（ 'allstudents'=> $ STU））;' – RiggsFolly

点击JSON标签，并期待在1000个其它similiar问题 – RiggsFolly

E/AndroidRuntime：致命异常：主过程：com。示例。 amr.fujeraapp，PID：4642 java.lang.IllegalArgumentException：目标不能为空。 –

在处理响应后，在适配器中设置数据，然后在for循环之外调用listAllItme（）方法。

来源

2017-02-13 04:22:30

？ –

内部尝试但循环后 –

E/AndroidRuntime：致命例外：主要进程：com.example.amr.fujeraapp，PID：13372 java.lang.IllegalArgumentException：目标不能为空。 at com.squareup.picasso.RequestCreator.into（RequestCreator.java:618） at com.squareup.picasso.RequestCreator.into（RequestCreator.java:601） at com.example.amr.fujeraapp.ByCategoryMenu $ listAdpter。 getView（ByCategoryMenu.java:136）在android.widget.AbsListView.obtainView（AbsListView.java:2338） –

如何将数据从Mysql数据库加载到Android列表视图

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