android 评论的展开功能 Android开发实现ListView点击展开收起效果示例

本文实例讲述了Android开发实现ListView点击展开收起效果。分享给大家供大家参考，具体如下：

废话不说先上效果：

实际上这是采用一个ExpandableListView实现的

布局文件很简单：

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context=".MainActivity" >

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="请选择您的类型："

android:textSize="30sp"

android:textColor="#ffffffff"

android:paddingLeft="5dp"

android:paddingTop="5dp"

android:paddingBottom="5dp"

android:background="#ff000000"/>

android:id="@+id/list"

android:layout_width="match_parent"

android:layout_height="match_parent">

然后就是具体实现：

这里主要是添加几个必须的属性 大多数方法不用重写

参考我代码中的位置稍加改动就行

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//创建一个ExpandableListAdapter对象

final ExpandableListAdapter adapter = new ExpandableListAdapter() {

int[] logos = new int[]{

R.drawable.human1st,

R.drawable.human1st,

R.drawable.human2nd,

R.drawable.human3rd

};

private String[] humanTypes = new String[]{

"不是人","聪明人","普通人","我这样的人"

};

private String[][] humans = new String[][]{

{"上仙","大神","荷兰猪"},

{"超人","一般聪明人","假的聪明人"},

{"努力的人","快乐的普通人","苦逼的普通人"},

{"天才","傻逼","蠢萌"}

};

//获得制定组的位置、指定子列表项处的字列表项数据

private TextView getTextView(){

AbsListView.LayoutParams layoutParams =

new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,164);

TextView textView = new TextView(MainActivity.this);

textView.setLayoutParams(layoutParams);

textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

textView.setPadding(36,0,0,0);

textView.setTextSize(30);

return textView;

}

@Override

public void registerDataSetObserver(DataSetObserver observer) {

}

@Override

public void unregisterDataSetObserver(DataSetObserver observer) {

}

@Override

public int getGroupCount() {

return humanTypes.length;

}

@Override

public int getChildrenCount(int groupPosition) {

return humans[groupPosition].length;

}

//获取制定组位置处的组数据

@Override

public Object getGroup(int groupPosition) {

return humanTypes[groupPosition];

}

@Override

public Object getChild(int groupPosition, int childPosition) {

return humans[groupPosition][childPosition];

}

@Override

public long getGroupId(int groupPosition) {

return groupPosition;

}

@Override

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

}

@Override

public boolean hasStableIds() {

return true;

}

//该方法决定每个组选项的外观

@Override

public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

LinearLayout linearLayout = new LinearLayout(MainActivity.this);

linearLayout.setOrientation(LinearLayout.HORIZONTAL);

ImageView logo = new ImageView(MainActivity.this);

logo.setImageResource(logos[groupPosition]);

linearLayout.addView(logo);

TextView textView = getTextView();

textView.setText(getGroup(groupPosition).toString());

linearLayout.addView(textView);

// linearLayout.setMinimumHeight(50);

return linearLayout;

}

@Override

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

TextView textView = getTextView();

textView.setText(getChild(groupPosition,childPosition).toString());

return textView;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

}

@Override

public boolean areAllItemsEnabled() {

return false;

}

@Override

public boolean isEmpty() {

return false;

}

@Override

public void onGroupExpanded(int groupPosition) {

}

@Override

public void onGroupCollapsed(int groupPosition) {

}

@Override

public long getCombinedChildId(long groupId, long childId) {

return 0;

}

@Override

public long getCombinedGroupId(long groupId) {

return 0;

}

};

ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);

expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

@Override

public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

Toast.makeText(MainActivity.this,"你是一个：" +

adapter.getChild(groupPosition,childPosition),Toast.LENGTH_SHORT).show();

return true;

}

});

expandableListView.setAdapter(adapter);

}

}

希望本文所述对大家Android程序设计有所帮助。