I am new in android development, I want to build a music player but the problem in front of me is how do i make my app open from gallery.
For example,
if we want to open any music file then we select it, the the android mobile ask which player do we want to use.
so how can I add my app in that option.
please help.
If you want your app to be in the list for opening an audio file, you need to tell the system your app can open those files. You can do that by adding something like the following to your activity tag in your AndroidManifest.xml:
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="content"/>
<data android:scheme="file"/>
<data android:mimeType="audio/*"/>
<data android:mimeType="application/ogg"/>
<data android:mimeType="application/x-ogg"/>
<data android:mimeType="application/itunes"/>
</intent-filter>
Intent filters are part of the core principles in Android development. You should try to get some knowledge on these basic topics before getting started.
It helps you
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
File file = new File(YOUR_SONG_URI);
intent.setDataAndType(Uri.fromFile(file), "audio/*");
startActivity(intent);
Actually you can open activity not app at self just simply add action intent filter in mainfest like this
<activity class=".foo" android:label="#string/title_notes_list">
<intent-filter>
<action android:name="com.me.love" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
other app code :
Intent intent = new Intent("com.me.love");
startActivity(intent);
however if you want to tell android system that your activity can handle some actions like share or send data you just have to add "send" action to your activity in mainfest like so :
<activity class=".boo" android:label="#string/title_notes_list">
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
</activity>
so now when ever user click share button android system will check all activitys that have action string "android.intent.action.SEND" then give the user list of activitys that have send action and if you did added same action as boo activity dose to your activity then it will be one of chooses in the list.
Related
I'm doing an NFC Application and was wondering if this scenario is possible:
Say, I have 2 NFC tags and 2 activities in one project.
NFC A is written to open up Activity A by writing MIME type in NFC A as
application/com.example.hello
In the project's manifest file, Activity A has this intent filter:
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<data android:mimeType="application/com.example.hello" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
So, this works perfectly fine.
I'm going to add another NFC Tag, and another activity.
NFC B is written to open up Activity B
Now, how should I write my MIME type into NFC B and set up the intent-filter for Activity B? Considering Activity A and Activity B are both in one project and package.
If I write the same MIME type in NFC A and B for Activity A and B, I will be asked which activity to open upon tapping and I don't want that.
One way might be to have two MimeTypes in your manifest. Then you have those MimeTypes linked to an (additional) activity which will check which MimeType is actually on your tag (A or B). Depending on what you find you can lauch the respective activity A or B.
Depending on what you want to achieve, the easiest way would be to use two tags with two different record types (e.g. two different MIME types, but note that you should prefer to use NFC Forum external type names over custom MIME types!)
Assuming you have
Tag A:
+--------------------------------------+
| MIME:application/com.example.hello.a |
+--------------------------------------+
Tag B:
+--------------------------------------+
| MIME:application/com.example.hello.b |
+--------------------------------------+
Then you can define intent filters for your activities, so that ActivityA will only be triggered by tag A and ActivityB will only be triggered by tag B:
<activity android:name=".ActivityA" ...>
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="application/com.example.hello.a" />
</intent-filter>
</activity>
<activity android:name=".ActivityB" ...>
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="application/com.example.hello.b" />
</intent-filter>
</activity>
In my app manifest i wrote this code to open some links with my app adding the intent-filter:
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="https" android:host="example.com" />
</intent-filter>
I tried to send via email to myself a link; for example: http://www.example.com/1234. click over the link i open the app.. That's great. Now, is it possible take the 1234 part of the link and put it into a textview? Something like:
mTextView.setText(textFromLink);
thanks
Did you already get access to the URL inside your app? If not, you can get it e.g. in your onCreate method with
Uri link = getIntent().getData();
which returns a Uri object:
http://developer.android.com/reference/android/net/Uri.html
This object has several methods to get the specific parts of the URL. In your case it will probably be
String content = link.getLastPathSegment():
http://developer.android.com/reference/android/net/Uri.html#getLastPathSegment()
This returns a string that you can set in your TextView:
mTextView.setText(content);
In IOS I have 2 apps (App A and App B) that will be performing different objective but at 1 point, App A will call App B using uri scheme to perform a function where App A does not have.
I wanted to implement this function to Android and currently have developed a demo for initiating call to App B. Now I am working on App B that will be receiving the uri scheme from the demo app.
Problem:
After App B return to the demo app using uri scheme I close the demo app.
When I go back to home page and open the multitask to reopen App B(or open App B through the icon), the page it reopen is the function that is used for demo app but what I wanted is the login page of App B.
This is a part of the Manifest for the intent-filter
<activity
android:name="com.apps.MasterActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:clearTaskOnLaunch="true"
android:windowSoftInputMode="adjustPan" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<data
android:host="x-callback-url"
android:scheme="myapp" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
</intent-filter>
</activity>
This is where I call back to the demo app
Intent sendIntent = new Intent(Intent.ACTION_VIEW, responseUri);
sendIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
finish();
startActivity(sendIntent);
Try adding this to your activity tag in AndroidManifest.xml
android:clearTaskOnLaunch="true"
Apparently I kinda found a solution that can force the app to show the login page after going back to the demo app. By putting this code in the activity.java file.
#SuppressWarnings("deprecation")
#Override
public void onDestroy()
{
super.onDestroy();
System.runFinalizersOnExit(true);
System.exit(0);
}
I know its a deprecated function that I'm using but will try to solve it when there's something wrong in the future or when I found a better solution for it.
Edit:
Found a better solution that does not need to use the deprecated function which I have forgotten to set it to false.
I have a flag that is set to true when the app is connected through Uri Scheme which i just have to set it to false and it will be fixed. This is the change location that I made
Intent sendIntent = new Intent(Intent.ACTION_VIEW, responseUri);
sendIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
finish();
startActivity(sendIntent);
Util.isUriScheme = false;
As in WhatsApp, if you click on a name to call, down the list you will find the WhatsApp logo in front of the number if you want to txt using WhatsApp.
Can we add the easyPhoneCard in that list, so the user can directly call using that option without clicking on the prompt to call.
You have to add in your manifest some rules.
In that way, Android will be able to list your application as compatible with a specific action (here is call action)
I think it will be something like
<intent-filter>
<action android:name="android.intent.action.CALL" />
<category android:name="android.intent.category.DEFAULT" />
<action android:name="android.intent.action.CALL_PRIVILEGED" />
<data android:scheme="tel" />
</intent-filter>
(add this in your activity node that will handle operations)
I have added my Android app to the "Share-Via" window. Following code is added to the onCreate() method of my code.
if(getIntent().getAction().equals(Intent.ACTION_SEND))
{
String text = getIntent().getStringExtra(Intent.EXTRA_TEXT);
textField.setText(text);
}
Now the issues is, if this app activity get called from the share-via, it works. But if it get called directly (user opens the app -> go to that activity) this crashes with NullPointerException. I am getting NullPointerException right in here
if(getIntent().getAction().equals(Intent.ACTION_SEND))
Following is how this Share-Via configured in the manifest file.
<activity
android:name="com.xx.xx.xx"
android:screenOrientation="portrait"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain"/>
</intent-filter>
</activity>
What is the issue here?
Either getIntent() or getAction() is returning null.
You need to check for that.