ScrollView嵌套ListView,GridView数据加载不全问题的解决

时间：2021-06-02 18:24:07

我们大家都知道ListView,GridView加载数据项，如果数据项过多时，就会显示滚动条。ScrollView组件里面只能包含一个组件，当ScrollView里面嵌套listView,GridView时，由于ScrollView，ListView,GridView都有滚动条，系统默认ScrollView的滚动条，ListView,GridView的滚动条会被忽略，就会出现数据加载不全的问题。解决这种问题，要利用自定义布局的知识解决，具体实现如下所示：

一.ListView数据加载不全问题的解决的解决

1.MyListViewActivity.class

public class MyListViewActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_my_list_view);

    }

}

　　

2.MyListView.class

/**

 * 自定义listView,解决scrowView嵌套listView,

 * listView里面的滚动条不显示导致数据显示不全的问题

 */

public class MyListView extends ListView {

    public MyListView(Context context) {

        super(context);

    }

    public MyListView(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    public MyListView(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

    }

    @Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int exeSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE>>2,MeasureSpec.AT_MOST);

        super.onMeasure(widthMeasureSpec, exeSpec);

    }

}

3.strings.xml

　　

<resources>

    <string name="app_name">泰洋</string>

    <string-array name="userName">

        <item>马里山</item>

        <item>陈渠珍</item>

        <item>金日成</item>

        <item>金成日</item>

        <item>姜涛</item>

        <item>李想</item>

        <item>牛奔</item>

        <item>金鑫</item>

        <item>乐嘉</item>

        <item>刘梅</item>

        <item>樊城</item>

        <item>卢决</item>

        <item>邓乐</item>

        <item>陈吉</item>

    </string-array>

</resources>

　　

4.activity_my_list_view.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_my_list_view"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context="com.langdon.taiyang.androidtest.autoView.MyListViewActivity">

    <!--方式一

    <ListView

        android:entries="@array/userName"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 3"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 4"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 5"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 6"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />-->

    <!--方式二

    <ScrollView

        android:layout_width="match_parent"

        android:layout_height="match_parent">

        <LinearLayout

            android:orientation="vertical"

            android:layout_width="match_parent"

            android:layout_height="wrap_content">

            <ListView

                android:entries="@array/userName"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 1"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 2"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 3"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 4"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 5"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 6"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

        </LinearLayout>

    </ScrollView>-->

    <!--方式三-->

    <ScrollView

        android:layout_width="match_parent"

        android:layout_height="match_parent">

        <LinearLayout

            android:orientation="vertical"

            android:layout_width="match_parent"

            android:layout_height="wrap_content">

            <com.langdon.taiyang.androidtest.autoView.MyListView

                android:entries="@array/userName"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 1"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 2"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 3"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 4"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 5"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 6"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

        </LinearLayout>

    </ScrollView>

</LinearLayout>

　　效果图如下：

ScrollView嵌套ListView,GridView数据加载不全问题的解决 ScrollView嵌套ListView,GridView数据加载不全问题的解决 ScrollView嵌套ListView,GridView数据加载不全问题的解决

总结：从左往右是：方法一，方法二，方法三的图片；方法二显示的就是ListView加载数据不全的情况

二.GridView数据加载不全问题的解决的解决

1.MyGridViewActivity.class

public class MyGridViewActivity extends AppCompatActivity {

    private GridView gv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_my_grid);

        gv = (GridView) findViewById(R.id.gv_my_gridView);

        gv.setAdapter(new MyAdapter(this));

        gv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(MyGridViewActivity.this,"gridview"+position,Toast.LENGTH_LONG).show();

            }

        });

    }

    //自定义适配器

    static class MyAdapter extends BaseAdapter {

        private Context context;

        public MyAdapter(Context context){

            this.context = context;

        }

        private int[] imges = {R.mipmap.gradview_dog_one,R.mipmap.gradview_dog_two,R.mipmap.gradview_dog_three,

                R.mipmap.gradview_dog_one,R.mipmap.gradview_dog_two,R.mipmap.gradview_dog_three,

                R.mipmap.gradview_dog_one,R.mipmap.gradview_dog_two,R.mipmap.gradview_dog_three,

                R.mipmap.gradview_dog_one,R.mipmap.gradview_dog_two,R.mipmap.gradview_dog_three,};

        private String[] names = {"拉布拉多","泰迪","柴犬","牧羊犬",

                "拉布拉多","泰迪","柴犬","牧羊犬",

                "拉布拉多","泰迪","柴犬","牧羊犬"};

        @Override

        public int getCount() {

            return names.length;

        }

        @Override

        public Object getItem(int position) {

            return names[position];

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            LayoutInflater layoutInflater = LayoutInflater.from(context);

            View view = layoutInflater.inflate(R.layout.gridview_item,null);

            ImageView iv = (ImageView) view.findViewById(R.id.iv_gridview_img);

            TextView tv = (TextView) view.findViewById(R.id.tv_gridview_name);

            iv.setImageResource(imges[position]);

            tv.setText(names[position]);

            return view;

        }

    }

}

　　

2.MyGridView.class

/**

 * 自定义gridView,解决scrowView嵌套gridView,

 * gridView里面的滚动条不显示导致数据显示不全的问题

 */

public class MyGridView extends GridView {

    public MyGridView(Context context) {

        super(context);

    }

    public MyGridView(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    public MyGridView(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

    }

    @Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int exeSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE>>2,MeasureSpec.AT_MOST);

        super.onMeasure(widthMeasureSpec, exeSpec);

    }

}

　　

3.activity_my_grid.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context="com.langdon.taiyang.androidtest.autoView.MyGridViewActivity">

    <!--方式一

    <GridView

        android:id="@+id/gv_my_gridView"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:numColumns="4"

        android:horizontalSpacing="10dp"

        android:verticalSpacing="10dp" />

    <Button

        android:text="button 1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 3"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 4"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 5"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:text="button 6"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />-->

    <!--方式二：scrollView中只能有一个组件

    <ScrollView

        android:layout_width="match_parent"

        android:layout_height="match_parent">

        <LinearLayout

            android:orientation="vertical"

            android:layout_width="match_parent"

            android:layout_height="wrap_content">

            <GridView

                android:id="@+id/gv_my_gridView"

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:numColumns="4"

                android:horizontalSpacing="10dp"

                android:verticalSpacing="10dp" />

            <Button

                android:text="button 1"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 2"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 3"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 4"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 5"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 6"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

        </LinearLayout>

    </ScrollView>-->

    <!--方式三-->

    <ScrollView

        android:layout_width="match_parent"

        android:layout_height="match_parent">

        <LinearLayout

            android:orientation="vertical"

            android:layout_width="match_parent"

            android:layout_height="wrap_content">

            <com.langdon.taiyang.androidtest.autoView.MyGridView

                android:id="@+id/gv_my_gridView"

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:numColumns="4"

                android:horizontalSpacing="10dp"

                android:verticalSpacing="10dp" />

            <Button

                android:text="button 1"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 2"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 3"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 4"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 5"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

            <Button

                android:text="button 6"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

        </LinearLayout>

    </ScrollView>

</LinearLayout>

　　

效果图如下：

ScrollView嵌套ListView,GridView数据加载不全问题的解决 ScrollView嵌套ListView,GridView数据加载不全问题的解决 ScrollView嵌套ListView,GridView数据加载不全问题的解决

总结：从左往右依次是：方法一，方法二，方法三的图片；方法二显示的就是GridView加载数据不全的情况

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