android - 如何通过切换按钮调整整个 ListView 的大小？

Question

我想显示一个切换按钮，使用 On/state 可以放大整个 ListView ，使用 Off/state 可以将其返回到正常的上一个 View 。我设法创建了切换按钮，但是当按下它时，它会自行放大而不是 ListView 。如何关联切换按钮以放大打开/关闭整个 ListView ？提前致谢。

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

<ListView
    android:id="@+id/tvList"
    android:layout_width="match_parent"
    android:layout_height="0dip"
    android:layout_weight="1"/>

<ToggleButton
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/toggle_button"
    android:textOn="Resize On"
    android:textOff="Resize Off"
    android:layout_weight="0.03"
    android:onClick="changeSizeState"/>

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ToggleButton;
import android.view.ViewGroup.LayoutParams;
import static john.android.study.R.id.tvList;



public class MainActivity extends Activity {

    private ListView lvPhone;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lvPhone = (ListView)findViewById(R.id.tvList);

        String[] values = new String[]{"Nikos", "Yiannis", "Kostas", "Thanasis", "Paulos",};

        ListView lvPhone = (ListView)findViewById(tvList);

        List<PhoneBook> listPhoneBook = new ArrayList<PhoneBook>();

        for (String value : values) {
            PhoneBook entry = new PhoneBook(value);
            listPhoneBook.add(entry);
        }

        PhoneBookAdapter adapter = new PhoneBookAdapter(this,listPhoneBook);
        lvPhone.setAdapter(adapter);
    }
    public void changeSizeState (View view){
        boolean checked = ((ToggleButton)view).isChecked();
        if(checked) {
            LayoutParams params = view.getLayoutParams();
            params.height = 250;
            view.setLayoutParams(params);
        }
    }
}

Answer 1

您正在将布局参数设置为 toogle 按钮，在 listview 上尝试:

public void changeSizeState (View view){
        boolean checked = ((ToggleButton)view).isChecked();
        if(checked) {
            LayoutParams params = view.getLayoutParams();
            params.height = 250;
            lvPhone.setLayoutParams(params);
        }
    }

同时你在onCreate中启动了一个新的listView，修改如下:

lvPhone = (ListView)findViewById(tvList);

希望这对您有所帮助。