使 ListView 项目选择保持稳定

Question

如何让ListView的Item Selection保持稳定？

     <ListView
        android:id="@+id/list_slidermenu"        
        android:layout_height="0dp"
        android:layout_width="match_parent"
        android:layout_weight="8"       
        android:layout_gravity="start"
        android:scrollbars="none"
        android:fastScrollEnabled="true"
        android:choiceMode="singleChoice"
        />

Answer 1

您必须在适配器中创建 getSelectedIndex() 和 setSelectedIndex() 方法。

private int selectedIndex;

public int getSelectedIndex() {
    return selectedIndex;
}

public void setSelectedIndex(int index) {
    this.selectedIndex = index;

    // Re-draw the list by informing the view of the changes
    notifyDataSetChanged();
}

然后

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

     .......

    // Highlight the selected item in the list
    if (selectedIndex != -1 && selectedIndex == position) {
        v.setBackgroundResource(R.color.yourColor);
    }

    return v;
}

并从 onListItemClick(....)

使用

 adapter.setSelectedIndex(position);

@Sun 所说的另一种方式

使用渐变使列表选择保持稳定

gradient_bg.xml:-

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
  android:startColor="#7ecce8"
  android:centerColor="#7ecce8"
  android:endColor="#7ecce8"
  />
</shape>

gradient_bg_hover.xml:-

<?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
  android:startColor="#7ecce8"
  android:centerColor="#7ecce8"
  android:endColor="#7ecce8"
  />
</shape>

list_selector.xml:-

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
 android:state_selected="false"
    android:state_pressed="false"
    android:drawable="@drawable/gradient_bg" />

<item android:state_pressed="true"
    android:drawable="@drawable/gradient_bg_hover" />

<item android:state_selected="true"
 android:state_pressed="false"
    android:drawable="@drawable/gradient_bg_hover" />
 </selector>

最后在 ListView 中，使用 listSelector 属性如下所示：

android:listSelector="@drawable/list_selector"

Answer 2

You need to keep track of selected item and accordingly change the background of the list row.

1.Change 所选项目在项目点击中的位置：

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3) {
        adapter.setSelectedItem(position);
}

2.Get 已选择项目并设置背景：

public class AudioAdapter extends ArrayAdapter<Audio> {
    Integer selected_position = -1;

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Your Code

        if (position == selected_position) {
            // set selected color
            v.setBackgroundResource(R.color.yourSelectedColor);
        } else {
            // set default color
            v.setBackgroundResource(R.color.yourDefaultColor);
        }
    }

    public int getSelectedItem() {
        return selected_position;
    }

    public void setSelectedItem(int index) {
        this.selected_position = index;
    }
}

希望对你有帮助ツ

Answer 3

我已经使用渐变来使列表选择保持稳定

gradient_bg.xml:-

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  <gradient
      android:startColor="#7ecce8"
      android:centerColor="#7ecce8"
      android:endColor="#7ecce8"
      />
</shape>

gradient_bg_hover.xml:-

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  <gradient
      android:startColor="#7ecce8"
      android:centerColor="#7ecce8"
      android:endColor="#7ecce8"
      />
</shape>

list_selector.xml:-

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
     android:state_selected="false"
        android:state_pressed="false"
        android:drawable="@drawable/gradient_bg" />

    <item android:state_pressed="true"
        android:drawable="@drawable/gradient_bg_hover" />

    <item android:state_selected="true"
     android:state_pressed="false"
        android:drawable="@drawable/gradient_bg_hover" />
</selector>

最后在 ListView 中，使用 listSelector 属性，如下所示：

android:listSelector="@drawable/list_selector"

使 ListView 项目选择保持稳定

Make ListView Item Selection remain Stable

android

listview

@Sun 所说的另一种方式