Android :: Launching Intent From Class Outside An Activity
Jul 28, 2010
I've got two activities, one of them is called MyActivity. I want both of them to be able to use a function located in a class othat we may call MyClass. In MyClass, I try to use an intent to launch the activity AnotherActivity. Since the constructor takes a context as parameter, I simply tried to store a context from the activity in the constructor, and then use it when I try to create my intent.However, even thought none of the arguments are null (checked that with a simple if-statement), intent seems to be null and a NullPointerException is thrown. Why does it not work, and what can I do to solve the problem?
I'm quite new to Android and Java development, so please explain it as basic as you can.
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Jul 2, 2010
My program has a list of tabs that each contain a list of people.Clicking a person should edit their details, but instead, clicking a person throws an ActivityNotFoundException.
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Apr 3, 2010
I'm having difficulties handling multiple instances of my root (main) activity for my application. My app in question has an intent filter in place to launch my application when opening an email attatchment from the "Email" app. My problem is if I launch my application first through the the android applications screen and then launch my application via opening the Email attachment it creates two instances of my root activity. steps: Launch root activity A, press home Open email attachment, intent filter triggers launches root activity A Is it possible when opening the Email attachment that when the OS tries to launch my application it detects there is already an instance of it running and use that or remove/clear that instance?
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Jul 23, 2009
I have an activity that is showing a video and when the user clicks a button, a new activity is launched. When the video activity stops, I pause the video view. When the video activity starts up again, I try to resume the video view videoView.start(), however, the video starts over from the beginning. I'm thinking that the buffer must be lost somewhere, so I now try to capture the current position via videoView.getCurrentPosition(), however, this is always returning 0.
Anybody know how to resume video playback when an activity starts up again?
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Jan 2, 2010
I have three classes one main-activity(named MainMap), one non-activity class(named MyItemizedOverlay), and one activity class(named AudioStream). I want to start AudioStream activity from non-activity class but i don't know how to.
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Mar 4, 2010
I had come across a code snippet which calls for an activity without referring to any context. Before, i was considering that context is used to tell about the calling component. But as i came see that another component can be called without any reference to context, it makes me wonder what purpose it might be serving. please put some light on it.
Here is the code which calls for an activity without referring to 'context'
CODE:............................
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Jul 25, 2010
I want to specifically run the default Android browser for a given URL. I'm using this code: I also tried adding <uses-library android:name="com.google.android.browser" /> to the manifest. Am I missing something here? PS: I'm not interested in using startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"))) as it will list all the choices for the browsing Intent.
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Aug 25, 2010
I know this has been asked a lot of times in StackOverflow already, but I haven't quite found a solution yet. My app sends an email with a link in it that when clicked should launch the app. According to @hackbod, the best way to do it is to make use of the Intent URI (see this). Here's my code that sets the intent and puts it in the email body: Code...
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Aug 16, 2009
Is there a way to launch a playlist whith intent? I can retrieve the path of the m3u playlist with: Cursor cursor = context.getContentResolver().query (MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, null, null, null, null); cursor.getString(cursor.getColumnIndex (MediaStore.Audio.Playlists.DATA)); But, I can't launch this m3u file neither with Intent nor with MediaPlayer.
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Feb 18, 2010
have an activity which launches another activity, via a button click. By default, on newer OS versions of android, the OS will animate the new activity sliding in from right to left.Is there a way to disable this animation? I just want the new activity to appear without any sort of animation.
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Nov 9, 2010
I have an activity that starts a long-running service which in turn adds an icon to the status bar. When the activity gets invisible, e.g. by pressing the Home button, and the pressing the icon in the status bar a new activity is created instead of showing the already created activity. If you now press the back button the new activity is destroyed and the activity created in the first place gets visible. How do I make the invisible activity brought to front when pressing the icon in the status bar instead of creating a new activity?
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Apr 18, 2010
My app needs to show Google Maps directions from A to B, but I don't want to put the Google Maps into my application - instead, I want to launch it using an Intent. Is this possible? If yes, how?
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Jul 15, 2009
Wine by the Bar app (free in Android Market) is crashing on the HTC Magic.What intent settings/extras are needed to successfully launch ACTION_IMAGE_CAPTURE on HTC Magic?intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);App works fine on G1.Also need proper intent for choosing an picture already on the phone, and a cropping intent.
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Jun 2, 2010
First of all let me say that this questions is slightly connected to another question by me. Actually it was created because of that. I have the following code to write a bitmap downloaded from the net to a file in the sd card:
// Get image from url
URL u = new URL(url);
HttpGet httpRequest = new HttpGet(u.toURI());
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity);
InputStream instream = bufHttpEntity.getContent();
Bitmap bmImg = BitmapFactory.decodeStream(instream);
instream.close();
// Write image to a file in sd card
File posterFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/Android/data/com.myapp/files/image.jpg");
posterFile.createNewFile();
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(posterFile));
Bitmap mutable = Bitmap.createScaledBitmap(bmImg,bmImg.getWidth(),bmImg.getHeight(),true);
mutable.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
// Launch default viewer for the file
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(posterFile.getAbsolutePath()),"image/*");
((Activity) getContext()).startActivity(intent);
A few notes. I am creating the "mutable" bitmap after seeing someone using it and it seems to work better than without it. And I am using the parse method on the Uri class and not the fromFile because in my code I am calling these in different places and when I am creating the intent I have a string path instead of a file. Now for my problem. The file gets created. The intent launches a dialog asking me to select a viewer. I have 3 viewers installed. The Astro image viewer, the default media gallery (I have a milstone on 2.1 but on the milestone the 2.1 update did not include the 3d gallery so it's the old one) and the 3d gallery from the nexus one (I found the apk in the wild). Now when I launch the 3 viewers the following happen:
Astro image viewer: The activity launches but I see nothing but a black screen.
Media Gallery: I get an exception dialog shown "The application MediaGallery (process com.motorola.gallery) has stoppedunexpectedly. Please try again" with a force close option.
3D gallery: Everything works as it should.
When I try to simply open the file using the Astro file manager (browse to it and simply click) I get the same option dialog but this time things are different:
Astro image viewer: Everything works as it should.
Media Gallery: Everything works as it should.
3D gallery: The activity launches but I see nothing but a black screen.
As you can see everything is a complete mess. I have no idea why this happens but it happens like this every single time. It's not a random bug. Am I missing something when I am creating the intent? Or when I am creating the image file? As noted in the comment here is the part of interest in adb logcat. Also I should note that I changed the way I create the image file. Since I want to create a file that reflects an online file I simply download it instead of creating a Bitmap and then creating the file (this was done because at some point I needed the Bitmap but now I do it the other way around). The problems persist thought and are exactly the same:
I/ActivityManager(18852): Starting
activity: Intent {
act=android.intent.action.VIEW
dat=/sdcard/Android/data/com.myapp/files/image.jpg
typ=image/* flg=0x3800000
cmp=com.motorola.gallery/.ViewImage }
I/ActivityManager(18852): Start proc
com.motorola.gallery:ViewImage for
activity
com.motorola.gallery/.ViewImage:
pid=29187 uid=10017 gids={3003, 1015}
I/dalvikvm(29187): Debugger thread not
active, ignoring DDM send
(t=0x41504e4d l=38)
I/dalvikvm(29187): Debugger thread not
active, ignoring DDM send
(t=0x41504e4d l=64)
I/ActivityManager(18852): Process
com.handcent.nextsms (pid 29174) has died.
I/ViewImage(29187): In View Image
onCreate!
D/AndroidRuntime(29187): Shutting down VM
W/dalvikvm(29187): threadid=3: thread
exiting with uncaught exception
(group=0x4001b170)
E/AndroidRuntime(29187): Uncaught
handler: thread main exiting due to
uncaught exception
E/AndroidRuntime(29187):
java.lang.RuntimeException: Unable to
start activity
ComponentInfo{com.motorola.gallery/com.motorola.gallery.ViewImage}:
java.lang.NullPointerException
E/AndroidRuntime(29187): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
E/AndroidRuntime(29187): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
E/AndroidRuntime(29187): at
android.app.ActivityThread.access$2200(ActivityThread.java:119)
E/AndroidRuntime(29187): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
E/AndroidRuntime(29187): at
android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(29187): at
android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(29187): at
android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime(29187): at
java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime(29187): at
java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(29187): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime(29187): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime(29187): at
dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(29187): Caused by:
java.lang.NullPointerException
E/AndroidRuntime(29187): at
com.motorola.gallery.ImageManager.allImages(ImageManager.java:5621)
E/AndroidRuntime(29187): at
com.motorola.gallery.ImageManager.getSingleImageListByUri(ImageManager.java:5515)
E/AndroidRuntime(29187): at
com.motorola.gallery.ViewImage.onCreate(ViewImage.java:1801)
E/AndroidRuntime(29187): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime(29187): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
E/AndroidRuntime(29187): ... 11 more
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Jun 25, 2009
From the JavaDoc, the EXTRA_STREAM parameter when launching an intent needs to be an URI. How can I pass a Bitmap object which I get from launching a "android.provider.MediaStore.ACTION_IMAGE_CAPTURE" intent? code...
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Jul 14, 2010
I'm just getting into Android development, and I have a question about communicating between a receiver class and an activity class. I'm very new to JAVA and Android so I hope I don't sound too stupid. I'm developing an application where I intercept an SMS message and then based on various elements of that SMS I might delete it once it's been saved to the inbox. I have a receiver class that intercepts the txt message, and I am also able to delete messages from my inbox with code in the activity class using a button at the moment. The problem I have is communicating between the receiver class and the activity class where the code to delete a message resides. I tried putting that code directly into the receiver class but as I'm sure most of you already know the BroadcastReceiver class doesn't seem to support what I need to delete messages. I've been searching for an answer to this for a while, but haven't been able to find anything. Honestly I'm not sure I know enough about JAVA and Android to even recognize a solution if I saw it.
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Sep 8, 2010
I'm new to Java and android development. In my application I need data which is accessible for a few activities. I've read that a good solution is to use Application class for this. So I use it like this:
public class MyApplication extends Application {
private String str;
public String getStr(){
return str;
}
public void setStr(String s){
str = s;
}
}
and I can access this variable from activity like this:........................................
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Oct 8, 2010
I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.
public class GsonParser extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MagazineThread thread=new MagazineThread();
thread.start();
}
public GsonParser(JsonMagazineParser Obj)
{
}
}
and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity class.how can i achieve that.
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Oct 14, 2010
I have four groups in a listview each with four url's I want to load in a webView. When the user select a url to goto I set a value like so;
if (position == 0) webb = webb +2;
{
Intent intent = new Intent(this, official.class);
startActivity(intent);
}
I then carryout the intent to move to the webView class where I have given each URL a value like so;
if (webb == 2) mWebView.loadUrl("http://yahoo.com");
if (webb == 3) mWebView.loadUrl("http://www.bbc.co.uk");
But the screen stays blank, if I state the value inside the official.class it works. How can I get this value to pass to another class based on the selection the user makes from the listview.
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Oct 16, 2010
I have been trying to get "getExtra" to work but without success, I have a listview with 4 choices which launch a webpage within a webView class, when the user selects the option lets say option 3 I want to pass the value of 3 to the webView class so that it will load the correct webpage, at the moment I get no errors, but the app force closes when I select the option, could this be due to having to announce this in the manifest? can somebody help with where I am going wrong. This is my intent
public void onListItemClick(ListView l, View v, int position, long id) {
if (position == 0) {
Intent intent = new Intent(this, official.class);
intent.putExtra("weburl", 3);
startActivity(intent);}
This is the official class:
public class official extends Activity {
int number = getIntent().getIntExtra("weburl", 0);
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
mWebView.goBack();
return true;
} return super.onKeyDown(keyCode, event);
} WebView mWebView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.browser1);
mWebView = (WebView) findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
if (number == 2) mWebView.loadUrl("http://bcafc.livewwware.co.uk");
if (number == 3) mWebView.loadUrl("http://www.bbc.co.uk");
mWebView.setWebViewClient(new HelloWebViewClient());
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May 5, 2010
I had write two classes IntentA and IntentB in my application (Both are in same package and both extends Activity class). In IntentA class I had created one button on pressing that button controll is trsnfer to IntentB class. IntentB class also contain Button on pressing that control is transfer to IntentA class.
This work fines. Now I want to set value in IntentA class using putExtra method and access that value in IntentB class How should I do that? I had put value in class IntentA like
Intent i1 = new Intent(this,IntentB.class);
i1.putExtra("Intent Name", "IntentA");
startActivity(i1);
Now I don't know How to access "Intent Name" value in IntentB class.
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Jun 10, 2010
I am trying to set the class for an intent to the address listed in a string value, so that I can launch a given activity. The string is composed dynamically during runtime.
Is there anyway to make something like the code below run...
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Jul 20, 2010
I'm programming an android application using the StartActivityForResult() - Method.
But, i want to get as result an own class, not a string or something like that.
how can i tell the intent to use the class i wrote to give back?
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Jun 29, 2010
I am calling intents alot in my program and I thought that I could write a public class that would have all of my intents so I can just call something like intents.testIntent(params) and then have it fire off the intent.
I tried it out but am getting a force close with a null pointer exception. This is my whole class. I know it is probably sloppy but I have just been learning java for 2 months so I still am an amateur. Any way, my code...
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Jul 28, 2009
I was experimenting with extending the Intent class but don't seem to make it work properly. I am wondering if extending is even possible. Here is the snippets.
Code for custom intent: Code...
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May 22, 2010
I am trying to launch another application from my Activity. Something weird happens when I am running this code :
Intent myIntent = new Intent( Intent.ACTION_MAIN, null );
myIntent.addCategory( Intent.CATEGORY_LAUNCHER );
myIntent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED );
ComponentName compName=new ComponentName(myArray[i][0], myArray[i] [1] );
// String[][] myArray myIntent.setComponent( compName ); startActivity( myIntent );
I have this error :
android.content.ActivityNotFoundException: Unable to find explicit activity class { com.android.settings/com.android.settings.Settings};
Have you declared this activity in your AndroidManifest.xml?
But when I replace this line
// myArray[i][0] = "com.android.settings" // myArray[i][1] = "com.android.settings.Settings" ComponentName compName=new ComponentName(myArray[i][0], myArray[i] [1] );
with ComponentName compName=new ComponentName("com.android.settings","com.android.settings.Settings");
And without any modification in my manifest, it works!
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Aug 9, 2010
I am implementing a simple app. I need to start an activity based on the state of the Activity. Lets take i am using a button to start the activity.
1. If the activity is not started, I need to start XYZ activity.
2. If the XYZ activity is on focus, then i need to close the activity on the button press.
3. If the XYZ activity is not in focus (like onPause) state then, I need to change the button state.Can you please help me in the flags that i need to use for starting the intent. Is it possible to get the state of activity before I start that activity?
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Jul 22, 2010
I'm not sure if this can be done, but is it possible to launch an activity from text that has been Linkified? I'm basically providing an illustrated glossary, and when the user clicks on a highlighted term, I want the activity that handles display of the image and associated text to fire up. I also need to pass in some parameters to the activity being launched.
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May 6, 2010
I have a TabActivity that loads in 3 activity classes.In those Activity classes I have a button and an OnClickListener that tries to open a MapActivity class.I have searched to find an example of an Activity class launching a MapActivity class but cannot find one. If I swap out my MapActivity class with a Activity class it works.
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Sep 3, 2010
Can I pass a singleton class's object from one activity to another activity using intent? I am using singleton class as image class img = image class.get Instance();, so i need the img instance for another activity, how can i pass an object instance in Android.
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