[android-developers] Re: did someone implement a ScrollView with horizontal scroll support?
Here is one Google made earlier, except they forgot to flip x/y. Took
about an hour to convert. :)
Oh, and it might not work with the 1.1 SDK, because of the attribute
set changes. It works fine with the 1.0 SDK.
Michael
/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package your.package.here;
import java.lang.reflect.Field;
import java.util.List;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.FocusFinder;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.animation.AnimationUtils;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Scroller;
import android.widget.TextView;
/**
* Layout container for a view hierarchy that can be scrolled by the
user,
* allowing it to be larger than the physical display. A ScrollView is
a
* {...@link FrameLayout}, meaning you should place one child in it
containing the
* entire contents to scroll; this child may itself be a layout
manager with a
* complex hierarchy of objects. A child that is often used is a
* {...@link LinearLayout} in a vertical orientation, presenting a
vertical array
* of top-level items that the user can scroll through.
*
*
* You should never use a ScrollView with a {...@link ListView}, since
ListView
* takes care of its own scrolling. Most importantly, doing this
defeats all of
* the important optimizations in ListView for dealing with large
lists, since
* it effectively forces the ListView to display its entire list of
items to
* fill up the infinite container supplied by ScrollView.
*
*
* The {...@link TextView} class also takes care of its own scrolling, so
does not
* require a ScrollView, but using the two together is possible to
achieve the
* effect of a text view within a larger container.
*
*
* ScrollView only supports vertical scrolling.
*/
public class HorizontalScrollView extends FrameLayout {
static final String TAG = "HScroll";
private static final int ANIMATED_SCROLL_GAP = 250;
/**
* When arrow scrolling, ListView will never scroll more than this
factor
* times the height of the list.
*/
private static final float MAX_SCROLL_FACTOR = 0.5f;
private long mLastScroll;
private final Rect mTempRect = new Rect();
private Scroller mScroller;
/**
* Flag to indicate that we are moving focus ourselves. This is so
the code
* that watches for focus changes initiated outside this ScrollView
knows that
* it does not have to do anything.
*/
private boolean mScrollViewMovedFocus;
/**
* Position of the last motion event.
*/
private float mLastMotionX;
/**
* True when the layout has changed but the traversal has not come
through
* yet. Ideally the view hierarchy would keep track of this for us.
*/
private boolean mIsLayoutDirty = true;
/**
* The child to give focus to in the event that a child has requested
focus
* while the layout is dirty. This prevents the scroll from being
wrong if the
* child has not been laid out before requesting focus.
*/
private View mChildToScrollTo = null;
/**
* True if the user is currently dragging this ScrollView around.
This is not
* the same as 'is being flinged', which can be checked by
* mScroller.isFinished() (flinging begins when the user lifts his
finger).
*/
private boolean mIsBeingDragged = false;
/**
* Determines speed during touch scrolling
*/
private VelocityTracker mVelocityTracker;
/**
* When set to true, the scroll view measure its child to make it
fill the
* currently visible area.
*/
private boolean mFillViewport;
/**
* Whether arrow scrolling is animated.
*/
private boolean mSmoothScrollingEnabled = true;
public HorizontalScrollView(Context context) {
super(cont
[android-developers] Re: did someone implement a ScrollView with horizontal scroll support?
The code in setScrollXY is not called anywhere in the class, and was old test code to get around the fact that some fields/methods are not available in sub-classes in different packages. It can be and should have been removed, but then again, who has time for that? Michael On Mar 12, 1:44 pm, Romain Guy wrote: > Do NOT use this implementation. The setScrollXY() method changes field > by reflection. Not only is it likely to break it's also VERY VERY > inefficient. Especially given the lookup is done *every* single time. > View already has methods to change the scroll X/Y values. > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: startActivity Problem
Thanks Yusuf,
that worked.
Still curious though, when did the startActivity behavior change? It
worked in an older project that was also 1.5.
Michael
On Jul 30, 11:52 am, "Yusuf T. Mobile"
wrote:
> Try using startService() to start your service instead of startActivity
> ().
>
> Yusuf Saib
> Android
> ·T· · ·Mobile· stick together
> The views, opinions and statements in this email are those of the
> author solely in their individual capacity, and do not necessarily
> represent those of T-Mobile USA, Inc.
>
> On Jul 30, 8:06 am, kolby wrote:
>
>
>
> > Hi all,
> > I'm trying to call a service directly, and I'm getting an
> > ActivityNotFoundException thrown.
>
> > My main class looks like this:
> > ---
> >
> > @Override
> > public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
> > PackageManager pm = getPackageManager();
> > try {
> > Log.i(TAG,"retrieving services:");
> > PackageInfo pinfo = pm.getPackageInfo("test.another",
> > PackageManager.GET_ACTIVITIES | PackageManager.GET_SERVICES);
> > for (ServiceInfo serv : pinfo.services) {
> > Log.i(TAG,"declared service: "+serv.name);
> > Log.i(TAG," package name: "+serv.packageName);
> > Log.i(TAG," enabled: "+serv.enabled);
> > Log.i(TAG," exported: "+serv.exported);
> > }
> > } catch (NameNotFoundException e) {
> > // TODO Auto-generated catch block
> > e.printStackTrace();
> > }
>
> > Intent i = new Intent();
> > i.setClassName("test.another", "test.another.MyService");
> > startActivity(i);
> > setContentView(R.layout.main);
> > }
> > ---
> > --
>
> > My service is empty, minus some log messages:
>
> > ---
> > -
> > public void onCreate() {
> > Log.i(T,"created");
> > }
>
> > public void onStart(Intent i, int code) {
> > Log.i(T,"started");
> > }
>
> > @Override
> > public IBinder onBind(Intent intent) {
> > // TODO Auto-generated method stub
> > return null;
> > }
> > ---
> > -
>
> > And the service is declared in the manifest file:
> > ---
> >
> >
> > http://schemas.android.com/apk/res/android";
> > package="test.another"
> > android:versionCode="1"
> > android:versionName="1.0">
> >
> > > android:label="@string/app_name">
> >
> >
> > > android:name="android.intent.category.LAUNCHER" />
> >
> >
> >
> >
> >
> >
>
> > ---
> > -
>
> > When I run it in either the emulator or on my phone, I get this log:
>
> > ---
> > -
> > 07-30 10:56:52.676: INFO/main(1686): retrieving services:
> > 07-30 10:56:52.686: INFO/main(1686): declared service:
> > test.another.MyService
> > 07-30 10:56:52.686: INFO/main(1686): package name: test.another
> > 07-30 10:56:52.696: INFO/main(1686): enabled: true
> > 07-30 10:56:52.696: INFO/main(1686): exported: false
> > 07-30 10:56:52.696: INFO/ActivityManager(56): Starting activity:
> > Intent { comp={test.another/test.another.MyService} }
> > 07-30 10:56:52.716: DEBUG/AndroidRuntime(1686): Shutting down VM
> > 07-30 10:56:52.716: WARN/dalvikvm(1686): threadid=3: thread exiting
> > with uncaught exception (group=0x4000fe70)
> > 07-30 10:56:52.716: ERROR/AndroidRuntime(1686): Uncaught handler:
> > thread main exiting due to uncaught exception
> > 07-30 10:56:52.746: DEBUG/dalvikvm(1622): GC freed 5960 objects /
> > 376680 bytes in 423ms
> > 07-30 10:56:52.746: ERROR/AndroidRuntime(1686):
> > java.lang.RuntimeException: Unable to start activity ComponentInfo
> > {test.another/test.another.Main}:
> > android.content.ActivityNotFoundException: Unable to find explicit
> > activity class {test.another/test.another.MyService}; have you
> > declared this activity in your AndroidManifest.xml?
> > 07-30 10:56:52.746: ERROR/AndroidRuntime(1686): at
> > android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
> > 2268)
> > 07-30 10:56:52.746: ERROR/AndroidRuntime(1686): at
> > android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
> > 2284)
> > 07-30
