Victoria,
The cause of this exception appears in logcat:
07-16 19:40:45.124: ERROR/AndroidRuntime(225): Caused by:
java.lang.NullPointerException
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
com.mobilevideoeditor.moved.EditGalleryView
$VideoAdapter.getCount(EditGalleryView.java:73)
Looks like vidUris is null.
Set a breakpoint and debug - looks like adapter's getCount() gets called
before the information (vidUris) becomes available.
-- Kostya
17.07.2010 0:49, Victoria пишет:
Hi,
I am trying to load videos from my emulated sdcard into my implemented
GridView, it worked fine before, when I used the GridView example from
Google...but now I get a Force close error when I try to open the app.
The entire app works (or rather should work) like this a TabView is
launched that includes 2 tabs (GalleryView.java and main.xml), each
tab loads a GridView (EditGalleryView.java and ShareGalleryView.java).
Before I tried loading videos into the gridView I simply used the
GridView example as starting point. Now on basis of this example I am
trying to load videos into my GridView from the sdcard, which
apparently seems to cause a Force Close Error.
If someone could help me find the problem that's causing this, it
would be great because I really don't know what's wrong now ...
Thanks in Advance
Here is the code I use:
The Manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android";
package="com.mobilevideoeditor.moved"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/
app_name">
<activity android:name=".EditGalleryView"
android:label="@string/app_name"
android:theme="@android:style/
Theme.NoTitleBar">
<intent-filter>
<action android:name="android.intent.action.PICK"/
</intent-filter>
</activity>
<activity android:name=".ShareGalleryView"
android:label="@string/app_name"
android:theme="@android:style/
Theme.NoTitleBar">
<intent-filter>
<action
android:name="android.intent.action.SEND"/>
</intent-filter>
</activity>
<activity android:name=".GalleryView"
android:label="@string/app_name"
android:theme="@android:style/
Theme.NoTitleBar">
<intent-filter>
<action
android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission
android:name="android.permission.READ_EXTERNAL_STORAGE"/>
</manifest>
The GalleryView.java:
package com.mobilevideoeditor.moved;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TabHost;
public class GalleryView extends TabActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources(); // Resource object to get
Drawables
TabHost tabHost = getTabHost(); // The activity TabHost
TabHost.TabSpec spec; // Reusable TabSpec for each tab
Intent intent; // Reusable Intent for each tab
// Create an Intent to launch an EditGallery for the tab (to be
reused)
intent = new Intent().setClass(this, EditGalleryView.class);
// Initialize a TabSpec for each tab and add it to the TabHost
spec = tabHost.newTabSpec("edit").setIndicator("Edit",
res.getDrawable(R.layout.ic_tab_edit))
.setContent(intent);
tabHost.addTab(spec);
intent = new Intent().setClass(this, ShareGalleryView.class);
spec = tabHost.newTabSpec("share").setIndicator("Share",
res.getDrawable(R.layout.ic_tab_share))
.setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(0);
}
}
The EditGalleryView.java (which seems to cause my problem):
package com.mobilevideoeditor.moved;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.VideoView;
public class EditGalleryView extends Activity {
Uri[] vidUris;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.videogrid);
GridView vGrid=(GridView) findViewById(R.id.vgrid);
vGrid.setAdapter(new VideoAdapter(this));
Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
Log.d("EditGalleryView", "uri:"+uri);
String[] projection = {
MediaStore.Video.Media.DESCRIPTION,
MediaStore.Video.Media.DATA
};
Cursor c = this.managedQuery(uri, projection, null, null,
MediaStore.Video.Media.DATE_ADDED);
Log.d("EditGalleryView", "vids available:"
+c.getCount());
ArrayList<Uri> experimentVids = new
ArrayList<Uri>();
if (c.getCount() != 0) {
c.moveToFirst();
//
experimentVids.add(Uri.parse(c.getString(1)));
while (c.moveToNext()) {
experimentVids.add(Uri.parse(c.getString(1)));
}
}
Log.d("ClassName",
"experimentVids.length:" +experimentVids.size());
if
(experimentVids.size() != 0) {
vidUris = new
Uri[experimentVids.size()];
for (int i = 0;
i< experimentVids.size(); i++) {
vidUris[i] =
experimentVids.get(i);
}
Log.d("EditGalleryView", "vidUris:"+vidUris.length);
}
}
public class VideoAdapter extends BaseAdapter {
private Context mContext;
public VideoAdapter(Context c) {
mContext = c;
}
public int getCount() {
//return mThumbIds.length;
return vidUris.length;
}
public Object getItem(int position) {
//return null;
return position;
}
public long getItemId(int position) {
//return 0;
return position;
}
// create a new ImageView for each item referenced by the
Adapter
public View getView(int position, View convertView, ViewGroup
parent) {
VideoView videoView;
if (convertView == null) { // if it's not recycled,
initialize some attributes
videoView = new VideoView(mContext);
videoView.setVideoURI(vidUris[position]);
videoView.setLayoutParams(new
GridView.LayoutParams(85, 85));
//
videoView.setScaleType(ImageView.ScaleType.CENTER_CROP);
videoView.setPadding(8, 8, 8, 8);
} else {
videoView = (VideoView) convertView;
}
// imageView.setImageResource(mThumbIds[position]);
return videoView;
}
And this is my LogCat Error Output:
07-16 19:40:45.074: ERROR/AndroidRuntime(225): Uncaught handler:
thread main exiting due to uncaught exception
07-16 19:40:45.124: ERROR/AndroidRuntime(225):
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.mobilevideoeditor.moved/
com.mobilevideoeditor.moved.GalleryView}: java.lang.RuntimeException:
Unable to start activity ComponentInfo{com.mobilevideoeditor.moved/
com.mobilevideoeditor.moved.EditGalleryView}:
java.lang.NullPointerException
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2496)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
2512)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.access$2200(ActivityThread.java:119)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.os.Handler.dispatchMessage(Handler.java:99)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.os.Looper.loop(Looper.java:123)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.main(ActivityThread.java:4363)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
java.lang.reflect.Method.invokeNative(Native Method)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
java.lang.reflect.Method.invoke(Method.java:521)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
dalvik.system.NativeStart.main(Native Method)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): Caused by:
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.mobilevideoeditor.moved/
com.mobilevideoeditor.moved.EditGalleryView}:
java.lang.NullPointerException
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2496)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.startActivityNow(ActivityThread.java:2335)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.LocalActivityManager.moveToState(LocalActivityManager.java:
127)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.LocalActivityManager.startActivity(LocalActivityManager.java:
339)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.widget.TabHost
$IntentContentStrategy.getContentView(TabHost.java:648)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.widget.TabHost.setCurrentTab(TabHost.java:320)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.widget.TabHost.addTab(TabHost.java:213)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
com.mobilevideoeditor.moved.GalleryView.onCreate(GalleryView.java:28)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
1047)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2459)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): ... 11 more
07-16 19:40:45.124: ERROR/AndroidRuntime(225): Caused by:
java.lang.NullPointerException
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
com.mobilevideoeditor.moved.EditGalleryView
$VideoAdapter.getCount(EditGalleryView.java:73)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.widget.GridView.setAdapter(GridView.java:128)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
com.mobilevideoeditor.moved.EditGalleryView.onCreate(EditGalleryView.java:
28)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
1047)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2459)
07-16 19:40:45.124: ERROR/AndroidRuntime(225): ... 20 more
--
Kostya Vasilev -- WiFi Manager + pretty widget -- http://kmansoft.wordpress.com
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