Edit Since version 26 of the support library (or androidx) you no longer need to implement a custom OnLongClickListener
to display the tooltip. Simply call this:
TooltipCompat.setTooltipText(menu_hotlist, getString(R.string.hint_show_hot_message));
I'll just share my code in case someone wants something like this:
layout/menu/menu_actionbar.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
...
<item android:id="@+id/menu_hotlist"
android:actionLayout="@layout/action_bar_notifitcation_icon"
android:showAsAction="always"
android:icon="@drawable/ic_bell"
android:title="@string/hotlist" />
...
</menu>
layout/action_bar_notifitcation_icon.xml
Note style and android:clickable properties. these make the layout the size of a button and make the background gray when touched.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center"
android:layout_gravity="center"
android:clickable="true"
style="@android:style/Widget.ActionButton">
<ImageView
android:id="@+id/hotlist_bell"
android:src="@drawable/ic_bell"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_margin="0dp"
android:contentDescription="bell"
/>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/hotlist_hot"
android:layout_width="wrap_content"
android:minWidth="17sp"
android:textSize="12sp"
android:textColor="#ffffffff"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@null"
android:layout_alignTop="@id/hotlist_bell"
android:layout_alignRight="@id/hotlist_bell"
android:layout_marginRight="0dp"
android:layout_marginTop="3dp"
android:paddingBottom="1dp"
android:paddingRight="4dp"
android:paddingLeft="4dp"
android:background="@drawable/rounded_square"/>
</RelativeLayout>
drawable-xhdpi/ic_bell.png
A 64x64 pixel image with 10 pixel wide paddings from all sides. You are supposed to have 8 pixel wide paddings, but I find most default items being slightly smaller than that. Of course, you'll want to use different sizes for different densities.
drawable/rounded_square.xml
Here, #ff222222 (color #222222 with alpha #ff (fully visible)) is the background color of my Action Bar.
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="2dp" />
<solid android:color="#ffff0000" />
<stroke android:color="#ff222222" android:width="2dp"/>
</shape>
com/ubergeek42/WeechatAndroid/WeechatActivity.java
Here we make it clickable and updatable! I created an abstract listener that provides Toast creation on onLongClick, the code was taken from from the sources of ActionBarSherlock.
private int hot_number = 0;
private TextView ui_hot = null;
@Override public boolean onCreateOptionsMenu(final Menu menu) {
MenuInflater menuInflater = getSupportMenuInflater();
menuInflater.inflate(R.menu.menu_actionbar, menu);
final View menu_hotlist = menu.findItem(R.id.menu_hotlist).getActionView();
ui_hot = (TextView) menu_hotlist.findViewById(R.id.hotlist_hot);
updateHotCount(hot_number);
new MyMenuItemStuffListener(menu_hotlist, "Show hot message") {
@Override
public void onClick(View v) {
onHotlistSelected();
}
};
return super.onCreateOptionsMenu(menu);
}
// call the updating code on the main thread,
// so we can call this asynchronously
public void updateHotCount(final int new_hot_number) {
hot_number = new_hot_number;
if (ui_hot == null) return;
runOnUiThread(new Runnable() {
@Override
public void run() {
if (new_hot_number == 0)
ui_hot.setVisibility(View.INVISIBLE);
else {
ui_hot.setVisibility(View.VISIBLE);
ui_hot.setText(Integer.toString(new_hot_number));
}
}
});
}
static abstract class MyMenuItemStuffListener implements View.OnClickListener, View.OnLongClickListener {
private String hint;
private View view;
MyMenuItemStuffListener(View view, String hint) {
this.view = view;
this.hint = hint;
view.setOnClickListener(this);
view.setOnLongClickListener(this);
}
@Override abstract public void onClick(View v);
@Override public boolean onLongClick(View v) {
final int[] screenPos = new int[2];
final Rect displayFrame = new Rect();
view.getLocationOnScreen(screenPos);
view.getWindowVisibleDisplayFrame(displayFrame);
final Context context = view.getContext();
final int width = view.getWidth();
final int height = view.getHeight();
final int midy = screenPos[1] + height / 2;
final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
Toast cheatSheet = Toast.makeText(context, hint, Toast.LENGTH_SHORT);
if (midy < displayFrame.height()) {
cheatSheet.setGravity(Gravity.TOP | Gravity.RIGHT,
screenWidth - screenPos[0] - width / 2, height);
} else {
cheatSheet.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, height);
}
cheatSheet.show();
return true;
}
}