Databases
StackOverflow2013
Postsdbo
POAndroid: Trying to start BluetoothSettings activity Force Close with NullPointerException
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAndroid: Trying to start BluetoothSettings activity Force Close with NullPointerException
    primarykey
    data
    text
    <p>I'm trying to bring up the standard window for Bluetooth Settings(with Device name, Discoverability etc).</p> <p>However, general approach with <code>startActivity(intent)</code> ends with NullPointerException pointing to<code>BluetoothSettings.java onCreate:135.</code></p> <p>Checking with the Android code, I've found that at line 135 they get some extras from the intent. So I prepare the same extras (names I've found in android core BluetoothDevicePicker interface) and issue it -- the same effect with NullPointerException.</p> <p>Might be the wrongs names of the extras I prepare?</p> <p>So is there a way I can see those extras (with names especially) from the intent the system itself submits when I open Bluetooth Settings manually acting like a user?</p> <p>Many thanks.</p> <p>My code is:</p> <pre><code>Intent settingsIntent = new Intent(); settingsIntent.setClassName("com.android.settings", com.android.settings.bluetooth.BluetoothSettings"); settingsIntent.putExtra("android.bluetooth.devicepicker.extra.LAUNCH_PACKAGE", "mypackage.bttoggle"); settingsIntent.putExtra("android.bluetooth.devicepicker.extra.DEVICE_PICKER_LAUNCH_CLASS", "mypackage.bttoggle.BluetoothWidget"); PendingIntent settingsPendingIntent = PendingIntent.getActivity(context, 0, settingsIntent, 0); views.setOnClickPendingIntent(R.id.btnSettings, settingsPendingIntent); </code></pre> <p>It's a widget so I need to use PendingIntent.</p> <p>This code get the following Exception at runtime:</p> <blockquote> <p>ERROR/AndroidRuntime(4905): Uncaught handler: thread main exiting due to uncaught exception ERROR/AndroidRuntime(4905): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.settings/com.android.settings.bluetooth.BluetoothSettings}: java.lang.NullPointerException ERROR/AndroidRuntime(4905): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596) ERROR/AndroidRuntime(4905): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) ERROR/AndroidRuntime(4905): at android.app.ActivityThread.access$2200(ActivityThread.java:126) ERROR/AndroidRuntime(4905): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) ERROR/AndroidRuntime(4905): at android.os.Handler.dispatchMessage(Handler.java:99) ERROR/AndroidRuntime(4905): at android.os.Looper.loop(Looper.java:123) ERROR/AndroidRuntime(4905): at android.app.ActivityThread.main(ActivityThread.java:4595) ERROR/AndroidRuntime(4905): at java.lang.reflect.Method.invokeNative(Native Method) ERROR/AndroidRuntime(4905): at java.lang.reflect.Method.invoke(Method.java:521) ERROR/AndroidRuntime(4905): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) ERROR/AndroidRuntime(4905): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) ERROR/AndroidRuntime(4905): at dalvik.system.NativeStart.main(Native Method) ERROR/AndroidRuntime(4905): Caused by: java.lang.NullPointerException ERROR/AndroidRuntime(4905): at com.android.settings.bluetooth.BluetoothSettings.onCreate(BluetoothSettings.java:135) ERROR/AndroidRuntime(4905): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) ERROR/AndroidRuntime(4905): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) ERROR/AndroidRuntime(4905): ... 11 more</p> </blockquote> <p>After investigating, I found that at line 135 in BluetoothSettings.java there is:</p> <pre><code>public class BluetoothSettings extends PreferenceActivity { ... 132 mNeedAuth = intent.getBooleanExtra(BluetoothDevicePicker.EXTRA_NEED_AUTH, false); 133 mFilterType = intent.getIntExtra(BluetoothDevicePicker.EXTRA_FILTER_TYPE, 134 BluetoothDevicePicker.FILTER_TYPE_ALL); 135 mLaunchPackage = intent.getStringExtra(BluetoothDevicePicker.EXTRA_LAUNCH_PACKAGE); 136 mLaunchClass = intent.getStringExtra(BluetoothDevicePicker.EXTRA_LAUNCH_CLASS); ... </code></pre> <p>I looked into BluetoothDevicePicker to find the names of the extras:</p> <pre><code>public interface BluetoothDevicePicker { public static final String EXTRA_NEED_AUTH = "android.bluetooth.devicepicker.extra.NEED_AUTH"; public static final String EXTRA_FILTER_TYPE = "android.bluetooth.devicepicker.extra.FILTER_TYPE"; public static final String EXTRA_LAUNCH_PACKAGE = "android.bluetooth.devicepicker.extra.LAUNCH_PACKAGE"; public static final String EXTRA_LAUNCH_CLASS = "android.bluetooth.devicepicker.extra.DEVICE_PICKER_LAUNCH_CLASS"; </code></pre> <p>So, I use them in my code to prepare those particular extras.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USpb2q
    1. USMax
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAndroid: Trying to start BluetoothSettings activity Force Close with NullPointerException
      1. USClyde Lobo
      1. VTFavorite
    2. VO
      singulars
      1. POAndroid: Trying to start BluetoothSettings activity Force Close with NullPointerException
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    3. VO
      singulars
      1. POAndroid: Trying to start BluetoothSettings activity Force Close with NullPointerException
      1. USUmer Farooq
      1. VTFavorite
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload