我刚刚设置了 ExpandableListView,到目前为止一切正常。在组/父级上,我有一个 TextView 和 Button。该列表的目的是让人们对应用程序中包含的不同声音进行采样,如果他们单击按钮,则声音将保存到 SD 卡中。这是我目前拥有的链接:http://imgur.com/djSCIrG
我的问题是,是否有可能在有人点击按钮并选择购买包后,是否可以只隐藏一个按钮而不是每组中的所有按钮。
这是我的主要布局 (expandablelistview_main.xml):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/soundpacktitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/expandablelistview_main_soundpacktitle_topmargin"
android:layout_centerHorizontal="true"
android:text="@string/soundpacktitle"
android:textSize="@dimen/expandablelistview_main_soundpacktitle_textsize" />
<ExpandableListView
android:id="@+id/soundpacklist"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_below="@+id/soundpacktitle"
android:layout_above="@+id/soundpackbottombar"
android:layout_marginTop="@dimen/expandablelistview_main_soundpacklist_topmargin"
android:transcriptMode="disabled"
android:cacheColorHint="#00000000"
android:listSelector="@android:color/transparent" />
</RelativeLayout>
这是我的组/父级布局 (expandablelistview_group.xml):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:orientation="horizontal" >
<TextView
android:id="@+id/grouptextview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:gravity="center_vertical"
android:layout_marginLeft="@dimen/expandablelistview_group_grouptextview_leftmargin"
android:textSize="@dimen/expandablelistview_group_grouptextview_textsize" />
<Button
android:id="@+id/buypackbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:layout_alignParentRight="true"
android:focusable="false"
android:focusableInTouchMode="false"
android:text="@string/buypack"
android:padding="@dimen/expandablelistview_group_buypackbutton_padding"
android:textSize="@dimen/expandablelistview_group_buypackbutton_textsize"
android:textStyle="bold" />
</RelativeLayout>
这是我的java类:
public class InAppSounds extends Activity {
private ExpandableListView soundpacklist;
private ArrayList<String> groups;
private ArrayList<ArrayList<ArrayList<String>>> childs;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandablelistview_main);
TextView soundpacktitle = (TextView) findViewById(R.id.soundpacktitle);
soundpacktitle.setTypeface(printbold);
// Declare the ExpandableListView and set's the indicator to the list arrows
soundpacklist = (ExpandableListView) findViewById(R.id.soundpacklist);
soundpacklist.setGroupIndicator(getResources().getDrawable(R.drawable.list_groupselector));
LoadData();
myExpandableAdapter adapter = new myExpandableAdapter(this, groups, childs);
soundpacklist.setAdapter(adapter);
}
// Loads the ExpandableListView with parent and children groups
private void LoadData() {
groups = new ArrayList<String>();
childs = new ArrayList<ArrayList<ArrayList<String>>>();
// String array that stores the parent and child names
String[] soundpackgroups = getResources().getStringArray(R.array.soundpackgroups);
String[] soundpack1 = getResources().getStringArray(R.array.soundpack1);
String[] soundpack2 = getResources().getStringArray(R.array.soundpack2);
String[] soundpack3 = getResources().getStringArray(R.array.soundpack3);
// First Sound Pack and their songs
groups.add(soundpackgroups[0]);
childs.add(new ArrayList<ArrayList<String>>());
for (int a = 0; a < soundpack1.length; a++) {
childs.get(0).add(new ArrayList<String>());
childs.get(0).get(a).add(soundpack1[a]);
}
// Second Sound Pack and their songs
groups.add(soundpackgroups[1]);
childs.add(new ArrayList<ArrayList<String>>());
for (int a = 0; a < soundpack2.length; a++) {
childs.get(1).add(new ArrayList<String>());
childs.get(1).get(a).add(soundpack2[a]);
}
// Third Sound Pack and their songs
groups.add(soundpackgroups[2]);
childs.add(new ArrayList<ArrayList<String>>());
for (int a = 0; a < soundpack3.length; a++) {
childs.get(2).add(new ArrayList<String>());
childs.get(2).get(a).add(soundpack3[a]);
}
}
public class myExpandableAdapter extends BaseExpandableListAdapter {
private final ArrayList<String> groups;
private final ArrayList<ArrayList<ArrayList<String>>> children;
private final Context context;
public myExpandableAdapter(Context context, ArrayList<String> groups,
ArrayList<ArrayList<ArrayList<String>>> children) {
this.context = context;
this.groups = groups;
this.children = childs;
}
@Override
public boolean areAllItemsEnabled() {
return true;
}
@Override
public ArrayList<String> getChild(int groupPosition, int childPosition) {
return children.get(groupPosition).get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
String child = getChild(groupPosition, childPosition).get(0);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.expandablelistview_child, null);
}
// TypeFace variable for the PrintBold
printbold = Typeface.createFromAsset(getAssets(), "fonts/PrintBold.otf");
TextView childtxt = (TextView) convertView.findViewById(R.id.childtextview);
childtxt.setTypeface(printbold);
childtxt.setText(child);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return children.get(groupPosition).size();
}
@Override
public String getGroup(int groupPosition) {
return groups.get(groupPosition);
}
@Override
public int getGroupCount() {
return groups.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
final String group = getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.expandablelistview_group, null);
}
// TypeFace variable for the PrintBold
printbold = Typeface.createFromAsset(getAssets(), "fonts/PrintBold.otf");
TextView grouptxt = (TextView) convertView.findViewById(R.id.grouptextview);
grouptxt.setTypeface(printbold);
grouptxt.setText(group);
final Button buypackbutton = (Button) convertView.findViewById(R.id.buypackbutton);
buypackbutton.setClickable(true);
buypackbutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder alert = new AlertDialog.Builder(InAppSounds.this);
if (group.equals("Pack #1")) {
alert.setCancelable(false);
alert.setTitle(getString(R.string.buypacktitle));
alert.setIcon(getResources().getDrawable(R.drawable.ic_audioicon));
alert.setMessage(getString(R.string.buypackmsg));
alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// check to make sure the SD card is mounted
// if not display an AlertDialog
if (!isSDPresent()) {
sdcardalert();
}
else {
// this will erase the button in all the groups, not just this group
buypackbutton.setVisibility(View.INVISIBLE);
}
}
});
alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alert.show();
}
}
});
return convertView;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
}
我将不胜感激在这件事上的任何指导。谢谢
最佳答案
是的。这很容易。您所要做的就是获取对按钮的引用并将可见性设置为消失。像这样:
Button sampleButton = (Button) findViewById(R.id.sample_button);
sampleButton.setVisiblity(View.GONE);
注意:当您将它设置为 View.GONE 时,最初分配给它的布局空间也会被删除。如果您只想删除按钮并保留布局空间使用 改为 View.INVISIBLE。
编辑: 下面是我将如何防止按钮重新出现:首先,我将使用一个 bool 值来跟踪 Activity 处于 Activity 状态时按钮的状态。然后在您重写 getChildView
时,我会检查这个 bool 值并相应地设置可见性。也许在 getChildView
回调中插入类似这样的内容,以防止在单击列表项时按钮重新出现:
if (!showButton) {
Button button = (Button) findViewById(R.id.sample_button);
button.setVisibility(View.GONE);
}
至于回到画面。为了跟踪是否不显示按钮,我将使用 bool 值并将其存储在 SharedPreferences 中。然后,同样在 getChildView
回调中,检查 bool 值的状态并相应地进行设置。像这样:
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
boolean showButtonStatusPref = settings.getBoolean("showButton", true);
if(!showButtonStatusPref) {
Button button = (Button) findViewById(R.id.sample_button);
button.setVisibility(View.GONE);
}
您唯一需要做的另一件事是管理每个按钮的状态。
编辑 2: 我完全忽略了 subview 使用相同布局的事实(呃!脑抽筋:))。
您仍然可以使用共享首选项来跟踪下载了哪些示例(为此您可以使用 Set)。您还需要创建一种方法来为每个样本分配“标识符”。从那里,您需要做的就是在每次调用 getChildView()
时执行检查,如果 Set 包含选定的示例标识符,则将按钮可见性设置为消失。这应该负责在示例未下载时显示按钮,而在示例下载后不显示按钮。在 getChildView()
中可能是这样的:
Set<String> defaultSet = new SortedSet<String>();
defaultSet.add("Nothing downloaded");
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SortedSet<String> listOfDowloaded = settings.getStringSet("isDownloadedList", );
if (listOfDownLoaded.contains(sampleDownloadIdentifier)) {
Button button = (Button) findViewById(R.id.some_id);
button.setVisiblity(View.GONE);
}
关于android - 在 ExpandableListView 中隐藏按钮,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14842411/