问题
I'm trying to put a dropdown/pulldown seekbar in the actionbar. I thought something like this in OnCreateOptionsMenu() would work:
SubMenu subMenu = menu.addSubMenu("DropTest");
MenuItem seekBarDrop = subMenu2.add("SeekBar");
SeekBar seekBar = new SeekBar(this);
seekBarDrop.setActionView(seekBar);
seekBarDrop.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
MenuItem subMenuItem = subMenu2.getItem();
subMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
But it fails miserably. I've also tried hacking it into a spinner adapter (using an IcsSpinner for actionbarsherlock):
ArrayAdapter<CharSequence> seekAdapter =
new ArrayAdapter<CharSequence>(context,
R.layout.spinner_subtitled_octave,
android.R.id.text1, new String[]{""});
seekAdapter.setDropDownViewResource(R.layout.seekbar);
MenuItem itemX = menu.add("SeekBar").setActionView(R.layout.spinner_ics);
itemX.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
IcsSpinner spinBar = (IcsSpinner) itemX.getActionView();
spinBar.setAdapter(seekAdapter);
/*
* This next part doesn't crash, but it also doesn't work
*/
LinearLayout sbLayout = (LinearLayout)
seekAdapter.getDropDownView(0, null, null);
SeekBar seekBar = (SeekBar) sbLayout.findViewById(R.id.v_seekbar);
seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
Log.d(TAG, "" + progress); // nope
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) { }
@Override
public void onStopTrackingTouch(SeekBar seekBar) { }
});
With seekbar.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/highlight"
/>
<SeekBar
android:id="@+id/v_seekbar"
android:minWidth="100dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="@dimen/spacer" />
</LinearLayout>
And spinner_seek.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/TextView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SEEKBAR"
android:padding="5dp"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/main" />
<TextView
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/highlight" />
</LinearLayout>
It at least gets a seekbar to dropdown, but I can't figure out how to get a reference to it.
Anybody know how to go the last mile?
Edit: I noticed after writing that PopupMenu exists, but it's only API 11+ (my project is 10+) or with HoloEverywhere. Hoping to do this without any libraries beyond ABS.
回答1:
Is this what you are looking for:
I made this by using BaseAdapter:
MainActivity:
public class MainActivity extends Activity implements OnNavigationListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar bar = getActionBar();
ArrayList<String> list = new ArrayList<String>();
list.add("bar 0 ");
list.add("bar 2 ");
list.add("bar 3 ");
list.add("bar 4 ");
Adapter adapter = new Adapter();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
bar.setListNavigationCallbacks(adapter.getAdapter(this, list, "Controls"), this);
adapter.setSeekBarListener( new SeekBarListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser, int positionInList) {
Log.i("", "onProgressChanged " + progress + " position in list" + positionInList);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar, int positionInList) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar, int positionInList) {
// TODO Auto-generated method stub
}
});
}
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
// TODO Auto-generated method stub
return false;
}
}
Adapter.class:
public class Adapter {
private SeekBarListener mListener;
public interface SeekBarListener{
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser, int positionInList);
public void onStartTrackingTouch(SeekBar seekBar, int positionInList);
public void onStopTrackingTouch(SeekBar seekBar, int positionInList);
}
public listAdapter getAdapter(Context context, ArrayList<String> list, String title){
return new listAdapter(context, list, title);
}
public void setSeekBarListener(SeekBarListener listener){
mListener = listener;
}
public class listAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private onSeekbarChange mSeekListener;
private ArrayList<String> itemsList;
private String title;
public listAdapter(Context context, ArrayList<String> list, String title){
mInflater = LayoutInflater.from(context);
if(mSeekListener == null){
mSeekListener = new onSeekbarChange();
}
this.itemsList = list;
this.title = title;
}
@Override
public int getCount() {
return itemsList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder2 holder;
if(convertView == null){
holder = new ViewHolder2();
convertView = mInflater.inflate(R.layout.baseadapter_layout, null);
holder.text_title = (TextView)convertView.findViewById(R.id.textView);
convertView.setTag(R.layout.baseadapter_layout, holder);
} else {
holder = (ViewHolder2)convertView.getTag(R.layout.baseadapter_layout);
}
holder.text_title.setText(title);
return convertView;
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.baseadapter_dropdown_layout, null);
holder.text = (TextView)convertView.findViewById(R.id.textView1);
holder.seekbar = (SeekBar)convertView.findViewById(R.id.seekBar1);
convertView.setTag(R.layout.baseadapter_dropdown_layout, holder);
} else {
holder = (ViewHolder)convertView.getTag(R.layout.baseadapter_dropdown_layout);
}
holder.text.setText(itemsList.get(position));
holder.seekbar.setOnSeekBarChangeListener(mSeekListener);
holder.seekbar.setTag(position);
return convertView;
}
}
static class ViewHolder {
TextView text;
SeekBar seekbar;
}
static class ViewHolder2 {
TextView text_title;
}
public class onSeekbarChange implements OnSeekBarChangeListener{
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
int position = (Integer) seekBar.getTag();
if(mListener != null){
mListener.onProgressChanged(seekBar, progress, fromUser, position);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
int position = (Integer) seekBar.getTag();
if(mListener != null){
mListener.onStartTrackingTouch(seekBar, position);
}
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int position = (Integer) seekBar.getTag();
if(mListener != null){
mListener.onStopTrackingTouch(seekBar, position);
}
}
}
}
baseadapter_layout.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="25dp"
android:layout_marginTop="18dp"
android:textColor="#FFFFFF"
android:text="Controls" />
baseadapter_dropdown_layout.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
android:textColor="#FFFFFF"
android:text="TextView" />
<SeekBar
android:id="@+id/seekBar1"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_marginTop="11dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_toRightOf="@+id/textView1" />
回答2:
It's a bit complicated but you could create your own PopupWindow for displaying the drop-down SeekBar.
The following should work with all of the standard Holo themes.
Activity:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
String title = "Seek Bar Test";
SeekBar seekBar = addDropDownSeekBar(this, menu, title);
return true;
}
private SeekBar addDropDownSeekBar(Context context, Menu menu, String title) {
LayoutInflater inflater = LayoutInflater.from(context);
View contentView = inflater.inflate(R.layout.drop_down_seek_bar, null);
SeekBar seekBar = (SeekBar) contentView.findViewById(R.id.drop_down_seek_bar);
final PopupWindow popupWindow = new PopupWindow(context, null,
android.R.attr.actionDropDownStyle);
popupWindow.setFocusable(true); // seems to take care of dismissing on click outside
popupWindow.setContentView(contentView);
setPopupSize(popupWindow);
final int paddingTop = getPaddingTop(popupWindow);
MenuItem menuItem = menu.add("");
FrameLayout button = createActionButton(context, title);
menuItem.setActionView(button);
menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// compensate for PopupWindow's internal padding
popupWindow.showAsDropDown(v, 0, -paddingTop);
}
});
return seekBar;
}
private FrameLayout createActionButton(Context context, String title) {
FrameLayout frame = new FrameLayout(context, null, android.R.attr.actionButtonStyle);
frame.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.MATCH_PARENT));
TextView text = new TextView(context, null, android.R.attr.actionMenuTextAppearance);
text.setGravity(Gravity.CENTER_VERTICAL);
text.setText(title);
frame.addView(text);
return frame;
}
private void setPopupSize(PopupWindow popupWindow) {
View contentView = popupWindow.getContentView();
int unspecified = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
contentView.measure(unspecified, unspecified);
int width = contentView.getMeasuredWidth();
int height = contentView.getMeasuredHeight();
Drawable background = popupWindow.getBackground();
if (background != null) {
Rect rect = new Rect();
background.getPadding(rect);
width += rect.left + rect.right;
height += rect.top + rect.bottom;
}
popupWindow.setWidth(width);
popupWindow.setHeight(height);
}
private int getPaddingTop(PopupWindow popupWindow) {
Drawable background = popupWindow.getBackground();
if (background == null)
return 0;
Rect padding = new Rect();
background.getPadding(padding);
return padding.top;
}
Layout file drop_down_seek_bar.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<SeekBar
android:id="@+id/drop_down_seek_bar"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" />
</FrameLayout>
来源：https://stackoverflow.com/questions/17407754/drop-down-seekbar-in-android-actionbar