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I know that this post is like this question : How to get a list of installed media players but i tried to test the code and it crashes ! this is the code :

public class Newactivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.display);
Intent intent = new Intent(Intent.ACTION_VIEW);
Uri uri = Uri.withAppendedPath(MediaStore.Video.Media.INTERNAL_CONTENT_URI,"1"); 
intent.setData(uri);
List<ResolveInfo> playerList;
PackageManager packageManager = null;
playerList = packageManager.queryIntentActivities(intent, 0);
    }

this is logcat errors:

10-19 13:05:52.770: E/AndroidRuntime(558): FATAL EXCEPTION: main
10-19 13:05:52.770: E/AndroidRuntime(558): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.upnpexample/com.upnpexample.Newactivity}: java.lang.NullPointerException
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.os.Looper.loop(Looper.java:123)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.ActivityThread.main(ActivityThread.java:3683)
10-19 13:05:52.770: E/AndroidRuntime(558):  at java.lang.reflect.Method.invokeNative(Native Method)
10-19 13:05:52.770: E/AndroidRuntime(558):  at java.lang.reflect.Method.invoke(Method.java:507)
10-19 13:05:52.770: E/AndroidRuntime(558):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-19 13:05:52.770: E/AndroidRuntime(558):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-19 13:05:52.770: E/AndroidRuntime(558):  at dalvik.system.NativeStart.main(Native Method)
10-19 13:05:52.770: E/AndroidRuntime(558): Caused by: java.lang.NullPointerException
10-19 13:05:52.770: E/AndroidRuntime(558):  at com.upnpexample.Newactivity.onCreate(Newactivity.java:31)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-19 13:05:52.770: E/AndroidRuntime(558):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
10-19 13:05:52.770: E/AndroidRuntime(558):  ... 11 more

any idea please ?

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user1735986
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1 Answers1

1

There may not be any content at that Uri, since you are making it up. Please use a Uri to an actual piece of content.

Beyond that, examine the stack trace in LogCat to see what you may be doing wrong.

UPDATE

PackageManager packageManager = null;
playerList = packageManager.queryIntentActivities(intent, 0);

Since packageManager is null, you will get a NullPointerException here. Use getPackageManager() to get an instance of PackageManager.

CommonsWare
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  • I examine the trace but i don't know what I must modify ! – user1735986 Oct 19 '12 at 13:10
  • I do PackageManager packageManager = this.getPackageManager(); but the NullPointerException persists – Ivan Apr 11 '13 at 09:49
  • Make sure your MediaStore content exists. If it doesn't exist "packageManager.queryIntentActivities(intent, 0);" will throw an exception. – William Seemann Apr 11 '13 at 14:26
  • @WilliamSeemann Thanks, In MediaStore is where I ask for video playerUri uri = Uri.withAppendedPath(MediaStore.Video.Media.INTERNAL_CONTENT_URI,"1"); I tried the code in devices with only the defaulst player and others with two and the exception continues – Ivan Apr 12 '13 at 07:33