Question

我遇到“GridView”的问题。如果我使用6个项目，那么在滚动时不会产生问题，但是当我增加no时。项目的行为是不可预测的。请查看以下视频链接，以便更好地了解我的问题： GridView Issues video link

我在这里附上我的代码：

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;
                }
            }
        }

Answer 1

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

不要使用它。或发送您的代码

滚动时GridView问题与大数据

1 个答案: