Scrollview下Listview中的TextView顯示多行時，無法顯示預想的效果時，只需要自定義一個ListView，重寫它的onMeasure

 

自定義了ListView，ListViewUtils.class

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

public class ListViewUtils extends ListView {
    public ListViewUtils(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
        // TODO Auto-generated method stub
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }
}

定義一個動態改變ListView高度的工具類：SetHeightUtils.class

import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

public class SetHeightUtils {
    /** 動態改變listView的高度 */
    public static void setListViewHeightBasedOnChildren(Activity activity, ListView listView1) {
        BaseAdapter listAdapter = (BaseAdapter) listView1.getAdapter();
        if (listAdapter == null) {
            return;
        }
        int totalHeight = 0;
        //獲取listView的寬度
        ViewGroup.LayoutParams params = listView1.getLayoutParams();
        int  listViewWidth  = activity.getWindowManager().getDefaultDisplay().getWidth();
        int widthSpec = View.MeasureSpec.makeMeasureSpec(listViewWidth, View.MeasureSpec.AT_MOST);
        for (int i = 0; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView1);
            //給item的measure設置參數是listView的寬度就可以獲取到真正每一個item的高度
            listItem.measure(widthSpec, 0);
            totalHeight += listItem.getMeasuredHeight();
        }
        params.height = totalHeight + (listView1.getDividerHeight() * (listAdapter.getCount() + 1));
        listView1.setLayoutParams(params);
    }

}

 自定義一個ListView的適配器：ListViewUtilsAdpater.class

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

public class ListViewUtilsAdpater extends BaseAdapter {


    private Context context;//運行上下文

    private LayoutInflater listContainer;  //視圖容器

    private List<TestBean> list;

    public ListViewUtilsAdpater(Context _context, List<TestBean> list){
        this.context = _context;
        this.listContainer = LayoutInflater.from(_context);
        this.list = list;
    }
    @Override
    public int getCount() {
        return this.list.size();
    }

    @Override
    public Object getItem(int position) {
        if(position >= list.size() || position < 0) {
            return null;
        } else {
            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(convertView == null) {
            view = listContainer.inflate(R.layout.item_list, null);
        }
        String string1 = list.get(position).getString1();
        String string2 = list.get(position).getString2();

        TextView tv_string1 = (TextView) view.findViewById(R.id.tv_string1);
        TextView tv_string2 = (TextView) view.findViewById(R.id.tv_string2);

        tv_string1.setText(string1);
        tv_string2.setText(string2);
        return view;
    }
}

適配器ListViewUtilsAdpater.class使用到的：TestBean.class

public class TestBean {
    private String string1;
    private String string2;

    public TestBean(String string1, String string2) {
        this.string1 = string1;
        this.string2 = string2;
    }

    public String getString1() {
        return string1;
    }

    public void setString1(String string1) {
        this.string1 = string1;
    }

    public String getString2() {
        return string2;
    }

    public void setString2(String string2) {
        this.string2 = string2;
    }
}

佈局文件xml：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
            <TextView
                android:id="@+id/tv1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!"
                />
            <nfc.kh.com.hkapp.view.ListViewUtils
                android:id="@+id/listview"
                android:layout_width="match_parent"
                android:layout_height="match_parent">
            </nfc.kh.com.hkapp.view.ListViewUtils>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!"
                />
        </LinearLayout>
    </ScrollView>


</LinearLayout>

item_list.xm:

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/tv_string1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="16sp"
        android:layout_weight="1"/>
    <TextView
        android:id="@+id/tv_string2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:padding="10dp"
        android:layout_weight="1"/>
</LinearLayout>

主頁MainActivity.class :

package nfc.kh.com.hkapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import nfc.kh.com.hkapp.view.ListViewUtils;

public class MainActivity extends AppCompatActivity {
    ListViewUtils listViewUtils;
    TextView tv1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listViewUtils = (ListViewUtils)findViewById(R.id.listview);
        tv1 = (TextView)findViewById(R.id.tv1);

        List<TestBean> list = new ArrayList<>();
        TestBean testBean = new TestBean("asd weyrfwedfhws98frwadmsafdjhweqfasfasdfasasasdaweas,asfsadfmdciuwegfiasm,dfue","afsadhfgweqfdasgfwqetfgawmndfshubfw");
        TestBean testBean1 = new TestBean("weyrfwedfhws98frwadmsafdjhweqfweas,asfsadfmdciuwegfiasm,dfue","afsadhasdfgweqfdasgfwqetfgawmndfshubfw");
        TestBean testBean2 = new TestBean("weyrfwedfhws98fe","fgawmndfshubfw");
        TestBean testBean3 = new TestBean("asd weyrfwedfhws98frwadmsafdjhweqfasfasdfasasasdaweas,asfsadfmdciuwegfiasm,dfue","afsadhfgweqfdasgfwqetfgawmndfshubfw");
        TestBean testBean4 = new TestBean("weyrfwedfhws98frwadmsafdjhweqfweas,asfsadfmdciuwegfiasm,dfue","afsadhasdfgweqfdasgfwqetfgawmndfshubfw");
        TestBean testBean5 = new TestBean("weyrfwedfhws98fe","fgawmndfshubfw");
        TestBean testBean6 = new TestBean("asd weyrfwedfhws98frwadmsafdjhweqfasfasdfasasasdaweas,asfsadfmdciuwegfiasm,dfue","afsadhfgweqfdasgfwqetfgawmndfshubfw");
        TestBean testBean7 = new TestBean("weyrfwedfhws98frwadmsafdjhweqfweas,asfsadfmdciuwegfiasm,dfue","afsadhasdfgweqfdasgfwqetfgawmndfshubfw");
        TestBean testBean8 = new TestBean("weyrfwedfhws98fe","fgawmndfshubfw");

        list.add(testBean);
        list.add(testBean1);
        list.add(testBean2);
        list.add(testBean3);
        list.add(testBean4);
        list.add(testBean5);
        list.add(testBean6);
        list.add(testBean7);


        ListViewUtilsAdpater listViewUtilsAdpater = new ListViewUtilsAdpater(this,list);
        listViewUtils.setAdapter(listViewUtilsAdpater);
        SetHeightUtils.setListViewHeightBasedOnChildren(this,listViewUtils);

        tv1.setFocusable(true);
        tv1.setFocusableInTouchMode(true);
        tv1.requestFocus();

    }
}

ScrollView內嵌ListView或者recyclerview打開時沒有在頂部的問題 

方法一：

手動設置滾動到頂部

scrollView.post(new Runnable() {   
    @Override    
    public void run() {  
           scrollView.fullScroll(ScrollView.FOCUS_UP); 
    }
});

方法二：

如果ScrollView控件上方有其他控件，則可以設置給該控件的焦點，讓滾動條回滾到頂部去：

View view=(View)findViewById(R.id.view);
view.setFocusable(true);
view.setFocusableInTouchMode(true);
view.requestFocus();