GridView Problem mit großen Daten beim Scrollen

-2

Ich habe ein Problem mit "GridView". Wenn ich 6 Elemente verwenden, dann erstellt es kein Problem beim Scrollen, aber wie ich Nr. Erhöhen. von Gegenständen ist sein Verhalten unvorhersehbar. Überprüfen Sie bitte das folgende Video-Link für eine bessere mein Problem zu verstehen: GridView Issues video link GridView Problem mit großen Daten beim Scrollen

ich meine Codes hier bin Befestigung:

activity_achievements.xml

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

      <RelativeLayout 
       android:id="@+id/header" 
       android:layout_width="match_parent" 
       android:layout_height="60dp" 
       android:layout_alignParentTop="true" 
       android:background="@color/green_color"> 

       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_centerVertical="true" 
        android:layout_marginLeft="10dp" 
        android:layout_toRightOf="@+id/back_iv" 
        android:text="Acheivements" 
        android:textColor="@color/white_color" 
        android:textSize="24sp" 
        android:textStyle="bold" /> 

       <ImageView 
        android:id="@+id/back_iv" 
        android:layout_width="25dp" 
        android:layout_height="25dp" 
        android:layout_alignParentLeft="true" 
        android:layout_centerVertical="true" 
        android:layout_marginLeft="10dp" 
        android:layout_marginRight="10dp" 
        android:src="@drawable/back" /> 

       <TextView 
        android:id="@+id/total_achievements_tv" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true" 
        android:layout_centerVertical="true" 
        android:layout_marginRight="10dp" 
        android:text="0/15" 
        android:textColor="@color/white_color" 
        android:textSize="24sp" 
        android:textStyle="bold" /> 
      </RelativeLayout> 

      <GridView 
       android:id="@+id/acheivements_gv" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:layout_below="@+id/header" 
       android:columnWidth="90dp" 
       android:gravity="center" 
       android:horizontalSpacing="5dp" 
       android:numColumns="2" 
       android:stretchMode="columnWidth" 
       android:verticalSpacing="5dp" /> 
     </RelativeLayout>

achievements_row.xml

 <?xml version="1.0" encoding="utf-8"?> 
     <com.xyz.quitsmoking.view.AchievementsView xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:card_view="http://schemas.android.com/apk/res-auto" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:gravity="center"> 

      <android.support.v7.widget.CardView 
       android:id="@+id/card_view2" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_below="@+id/card_view1" 
       android:layout_gravity="center" 
       android:layout_marginBottom="5dp" 
       android:layout_marginLeft="5dp" 
       android:layout_marginRight="5dp" 
       android:layout_marginTop="5dp" 
       card_view:cardCornerRadius="2dp" 
       android:background="@color/white_color" 
       card_view:contentPadding="2dp"> 

       <LinearLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" 
        android:orientation="vertical"> 

        <ImageView 
         android:id="@+id/image_iv" 
         android:layout_width="100dp" 
         android:layout_height="100dp" 
         android:layout_gravity="center" 
         android:layout_margin="10dp" 
         android:src="@drawable/achievement" /> 
        <TextView 
         android:id="@+id/title_tv" 
         android:layout_width="match_parent" 
         android:layout_height="match_parent" 
         android:layout_gravity="center" 
         android:gravity="center" 
         android:textSize="20sp" 
         android:padding="10dp" 
         android:text="Himalyi" 
         android:textColor="@color/green_color" /> 
        <TextView 
         android:id="@+id/desc_tv" 
         android:layout_width="match_parent" 
         android:layout_height="match_parent" 
         android:layout_gravity="center" 
         android:gravity="center" 
         android:textSize="16sp" 
         android:padding="10dp" 
         android:text="5 cigarettes non-smoked" 
         android:textColor="@color/teal_color" /> 
       </LinearLayout> 
      </android.support.v7.widget.CardView> 
     </pairroxz.com.quitsmoking.view.AchievementsView>

AchievementsAdapter.java

 public class AchievementsAdapter extends BaseAdapter { 
      private Context context; 
      private ArrayList<Achievements> list; 
      private LayoutInflater inflater; 

      public AchievementsAdapter(Context context,ArrayList<Achievements> list){ 
       this.context = context; 
       this.list = list; 
       initialize(); 
      } 

      private void initialize() { 
       inflater = LayoutInflater.from(context); 
      } 

      @Override 
      public int getCount() { 
       return list.size(); 
      } 

      @Override 
      public Object getItem(int position) { 
       return position; 
      } 

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

      @Override 
      public View getView(int position, View convertView, ViewGroup parent) { 
       AchievementsView view = null; 
       if(view==null) { 
        view = (AchievementsView) inflater.inflate(R.layout.achievements_row,null); 
       }else{ 
        view = (AchievementsView) convertView; 
       } 
       view.setContents(list.get(position)); 
       notifyDataSetChanged(); 
       return view; 
      } 

     }

AchievementsView.java

 public class AchievementsView extends RelativeLayout { 
      private TextView title_tv,desc_tv; 
      private ImageView image_iv; 


      public AchievementsView(Context context) { 
       super(context); 
      } 

      public AchievementsView(Context context, AttributeSet attrs) { 
       super(context, attrs); 
      } 

      public AchievementsView(Context context, AttributeSet attrs, int defStyleAttr) { 
       super(context, attrs, defStyleAttr); 
      } 

      @TargetApi(Build.VERSION_CODES.LOLLIPOP) 
      public AchievementsView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 
       super(context, attrs, defStyleAttr, defStyleRes); 
      } 

      @Override 
      protected void onFinishInflate() { 
       super.onFinishInflate(); 
       initialize(); 
      } 

      private void initialize() { 
       image_iv = (ImageView)findViewById(R.id.image_iv); 
       title_tv = (TextView)findViewById(R.id.title_tv); 
       desc_tv = (TextView) findViewById(R.id.desc_tv); 
      } 

      public void setContents(Achievements achievements){ 
       image_iv.setImageDrawable(getContext().getResources().getDrawable(achievements.getImg())); 
       title_tv.setText(achievements.getTitle()); 
       desc_tv.setText(achievements.getDesc()); 
      } 
     }

AchievementsActivity.java

 public class AchievementsActivity extends AppCompatActivity implements View.OnClickListener { 

      private GridView achievements_gv; 
      private AchievementsAdapter adapter; 
      private ArrayList<Achievements> list; 
      DatabaseHelper helper; 
      private ImageView back_iv; 

      @Override 
      protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 
       setContentView(R.layout.activity_achievements); 
       initialize(); 
      } 

      private void initialize() { 
       helper = DatabaseHelper.getInstance(this); 
       back_iv = (ImageView) findViewById(R.id.back_iv); 
       achievements_gv = (GridView) findViewById(R.id.acheivements_gv); 
       list = new ArrayList<Achievements>(); 
       getData(); 
       setListener(); 
      } 

      private void setListener() { 
       back_iv.setOnClickListener(this); 
      } 



      private void getData() { 
       list = helper.getAchievementsList(); 
       //list = 
       adapter = new AchievementsAdapter(this, list); 
       achievements_gv.setAdapter(adapter); 
      } 

      @Override 
      public void onClick(View v) { 
       switch (v.getId()) { 
        case R.id.back_iv: 
         onBackPressed(); 
         break; 
       } 
      } 
     }

Quelle

2016-11-10 Chirag Jain

Sie müssen eine Menge mehr Informationen als das zur Verfügung stellen. Layout jeder Zeile, Adaptercode usw. –

Dies sollte ein Problem der Wiederverwendung von Zellen/Gitterelementen sein. Der Grund, warum die ersten 6 richtig sind, liegt darin, dass diese Elemente beim ersten Laden auf dem Bildschirm sichtbar sind. Danach können Sie die Objekte erneut verwenden und den Inhalt aktualisieren. – necixy

if(view == null) 
view.setTag(viewHolder); 
viewHolder = (ViewHolder) view.getTag();

verwenden diese nicht. oder senden Sie Ihren Code

Quelle

2016-11-10 10:17:55 wVV

GridView Problem mit großen Daten beim Scrollen

Antwort

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