Hello!
I'm new to this group and (full disclosure) cross posting this
question here from StackOverflow, just because I'm not 100% sure how
my question will be found by other SO users (I made sure to read the
suggested "How To Ask Questions The Smart Way", and made sure to
search SO for a clear explanation, but I must have missed it). Here,
I'm clear that it'll be sent out to everyone, so here goes (my
apologies in advance if I shouldn't be cross-posting like this!)
I've got this odd problem which is happening on 1.6, 2.2, and a
MyTouch 3G Slide (which is API #7, and listed as "2.1-Update1" in the
Android Device Chooser).
The basic idea for my app is to make a stopwatch-sort of thing, in
that the user can tap a button to start a timer, then tap it again to
stop (pause) the timer; further taps alternate between resuming the
timer and pausing the timer.
I've got a top-level ScrollView which contains a RelativelLayout,
which contains a bunch of widgets. The first widget is a HUGE button
(so that it's easy to press), which pushes all my other widgets below
the bottom of the screen. This is intentional, as I want to rely on
the ScrollView (and an on-screen reminder to the user) to make the
rest of the input options available.
I've got a simple state-machine type setup, where mState is the
current mode (STATE_TIMER_NOT_STARTED before the user presses any
buttons, ...RUNNING after the first press, and then ...PAUSED after
the second, back to ...RUNNING after the third, etc, etc).
All this works great EXCEPT that when the timer is running, and the
user presses the start/stop/resume button again, the ScrollView will
scroll down a ways. I am NOT issuing this command (I don't even have
a reference to ScrollView object), and I'm not sure why it's doing
this.
REPRO:
Compile + run the below samples. When the app starts, press the
'Start Timing' button. Use your thumb (or the mouse) to touch-drag
the screen upwards (so you can see the RatingBar), then drag it back
downwards (so the button is again completely on-screen). Tap the
button (which now reads 'PauseTiming') again, and it'll jump down a
bit. It should NOT be jumping/scrolling down, since there's no
statement (that I can see) that tells it to scroll down. As near as I
can tell, it's the setText that causes the scrolling ( when I comment
those lines out, no scrolling occurs).
WHAT I'M ASKING FOR:
If I'm doing something dumb & you could point out what it is, I'd
really appreciate it! :)
*** I wonder if 'touch mode' might have something to do with this,
since it does NOT appear to happen (in the emulator) when I use the
mouse's scroll wheel to move the panel upwards (i.e.,instead of the
simulated finger-dragging). I can't find a whole lot on touch-mode,
and nothing specific on focus/selection in touch mode within a
ScrollView
If you can confirm that this error occurs for you too, that would be
ok, too (since misery loves company.*AHEM* I mean, since it might help
confirm that it's not just me :) ).
<b>MyTestApp.java</b>
<code>
package bug.android.scrollview;
import android.app.Activity;
import android.os.Bundle;
import android.text.format.Time;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
public class MyTestApp extends Activity {
public final static int STATE_TIMER_NOT_STARTED = 1;
public final static int STATE_TIMER_RUNNING = 2;
public final static int STATE_TIMER_PAUSED = 3;
private int mState;
Time t = new Time();
private Time data = new Time();
private Button btnStartStopResume;
private TextView lblSpacer;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_time_entry);
btnStartStopResume = (Button)
findViewById(R.id.btnStartStopResume);
// Set the button's size so that the other info will also be
visible
Display display = ((WindowManager)
getSystemService(WINDOW_SERVICE))
.getDefaultDisplay();
// This is such a hack, but the windowScroller doesn't appear to
// have a height at this point in the lifecycle (nor in
'onResume' :
( )
btnStartStopResume.setHeight(display.getHeight() - 200);
lblSpacer = (TextView) findViewById(R.id.lblSpacer);
reset();
}
public void doStartStopResume(View v) {
if (mState == MyTestApp.STATE_TIMER_NOT_STARTED) {
mState = MyTestApp.STATE_TIMER_RUNNING;
data.setToNow();
} else if (mState == MyTestApp.STATE_TIMER_RUNNING) {
mState = MyTestApp.STATE_TIMER_PAUSED;
String s = getString(R.string.add_scroll_down_to_add);
lblSpacer.setText(s);
} else if (mState == MyTestApp.STATE_TIMER_PAUSED) {
mState = MyTestApp.STATE_TIMER_RUNNING;
}
}
public void doReset(View v) {
}
public void doNewRunClick(View v) {
}
public void doAddTiming(View v) {
}
public void reset() {
mState = STATE_TIMER_NOT_STARTED;
}
}
</code>
<b>new_time_entry.xml</b>
<code>
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android";
android:id="@+id/windowScroller"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/btnStartStopResume"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dip"
android:text="Start Timing"
android:textSize="40dp"
android:height="290dp"
android:onClick="doStartStopResume" />
<TextView
android:id="@+id/lblSpacer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/btnStartStopResume"
android:layout_centerHorizontal="true"
android:text="@string/add_scroll_down_for_more" />
<TextView
android:id="@+id/lblTimeStartLabel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/lblSpacer"
android:layout_alignParentLeft="true"
android:clickable="true"
android:onClick="adjustStartTime"
android:text="Start of this run:"
android:textSize="8dp" />
<TextView
android:id="@+id/lblTimeStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblTimeStartLabel"
android:layout_alignParentLeft="true"
android:clickable="true"
android:onClick="adjustStartTime"
android:text="--:--:-- --"
android:textColor="#FFFFFF"
android:textSize="26dp" />
<TextView
android:id="@+id/lblElapsedLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblSpacer"
android:layout_alignRight="@id/lblSpacer"
android:layout_marginRight="5dp"
android:text="Elapsed Time:"
android:textSize="8dp" />
<TextView
android:id="@+id/lblTimeElapsed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblElapsedLabel"
android:layout_alignRight="@id/lblSpacer"
android:layout_marginRight="5dp"
android:textColor="#99ff66"
android:text="-- m -- sec"
android:textSize="26dp"
android:layout_marginBottom="10dip"/>
<CheckBox
android:id="@+id/chkNewRun"
android:onClick="doNewRunClick"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/lblTimeElapsed"
android:text="This is a new run of timings"
android:layout_marginBottom="10dip" />
<TextView
android:id="@+id/lblIntensity"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Intensity (1 = none 5 = max)"
android:layout_below="@id/chkNewRun" />
<RatingBar
android:id="@+id/rbIntensity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblIntensity"
android:numStars="5"
android:rating="2"
android:layout_marginBottom="5dip" />
<TextView
android:id="@+id/lblNotes"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Notes:"
android:layout_below="@id/rbIntensity" />
<EditText
android:id="@+id/txtNotes"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:drawable/editbox_background"
android:layout_below="@id/lblNotes"
android:layout_marginBottom="10dip" />
<Button
android:id="@+id/btnReset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtNotes"
android:layout_alignParentLeft="true"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:text="Reset"
android:onClick="doReset" />
<Button
android:id="@+id/btnOk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtNotes"
android:layout_toRightOf="@id/btnReset"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:text="Add Timing To List"
android:onClick="doAddTiming" />
</RelativeLayout>
</ScrollView>
</code>
<b>strings.xml</b>
<code>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Timer</string>
<string name="dlg_edit_timing_title">Edit A Timing</string>
<string name="add_scroll_down_for_more">< Scroll down for more
options! ></string>
<string name="add_scroll_down_to_add">< Scroll down to save this
timing! ></string>
<string name="start_timing">Start Timing\n\n</string>
<string name="stop_timing">Pause Timing\n\n</string>
<string name="resume_timing">Resume Timing\n\n</string>
</resources>
</code>
<b>AndroidManifest.xml</b>
<code>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/
android"
package="bug.android.scrollview"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/
app_name">
<activity android:name=".MyTestApp"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" /
>
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="5" />
</manifest>
</code>
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