MjpegView with other XML layouts

Question

I'm developing an APP that needs to gets the stream of an Airdrone through mjpeg.

I'm using the classes from this topic. It works great with the example but I need to add some other elements to the same view such as the buttons to control de airdrome.

The example code:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    mv = new MjpegView(this);
    setContentView(mv);
    ...

What i'm trying to do but is not working...

...
mv = (MjpegView) findViewById(R.id.mv);
setContentView(R.layout.activity_test);
...

And my layout xml...

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    tools:context="com.gabilheri.rosbridgecontroller.app.TestActivity"
    android:layout_height="fill_parent"
    android:id="@+id/mainLayout">
    <com.gabilheri.rosbridgecontroller.app.VideoStreamClasses.MjpegView
        android:id="@+id/mv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
    />
</FrameLayout>

This is the LOGCAT error:

04-26 22:40:19.521    2229-2229/com.gabilheri.rosbridgecontroller.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.gabilheri.rosbridgecontroller.app, PID: 2229
java.lang.NullPointerException
        at com.gabilheri.rosbridgecontroller.app.TestActivity$DoRead.onPostExecute(TestActivity.java:86)
        at com.gabilheri.rosbridgecontroller.app.TestActivity$DoRead.onPostExecute(TestActivity.java:59)
        at android.os.AsyncTask.finish(AsyncTask.java:632)
        at android.os.AsyncTask.access$600(AsyncTask.java:177)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5184)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1015)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:831)
        at dalvik.system.NativeStart.main(Native Method)

This are the lines from the method onPost execute:

mv.setSource(result);  //Line 86
mv.setDisplayMode(MjpegView.SIZE_BEST_FIT); // Line 87
mv.showFps(true); // Line 88

Anyone have any ideas? Thank you! :D

Answer 1

I figured it out what was my problem...

I was trying to do:

mv = (MjpegView) findViewById(R.id.mv);
setContentView(R.layout.activity_test);

And was getting a NullPointerException.. I changed to:

setContentView(R.layout.activity_test);
mv = (MjpegView) findViewById(R.id.mv);

And now everything is working like is supposed to be :)