Question

I downloaded zxing project and I created a simple activity with a button. This simple activity should start zxing project when the button is pressed.
now my problem is : that i want this simple activity with the button to be the start activity
i created the following tags to in the manifest file as follows:

start activity:

and the downloaded zxing project has an activity that always is launched in the beginning and it has the following manifest file:

<activity android:name=".CaptureActivity"
          android:screenOrientation="landscape"
          android:configChanges="orientation|keyboardHidden"
          android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
          android:windowSoftInputMode="stateAlwaysHidden">
  <intent-filter>
    <action android:name="android.intent.action.MAIN"/>
    <category android:name="android.intent.category.LAUNCHER"/>
  </intent-filter>
  <intent-filter>
    <action android:name="com.google.zxing.client.android.SCAN"/>
    <category android:name="android.intent.category.DEFAULT"/>
  </intent-filter>
  <!-- Allow web apps to launch Barcode Scanner by linking to http://zxing.appspot.com/scan. -->
  <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="http" android:host="zxing.appspot.com" android:path="/scan"/>
  </intent-filter>
  <!-- We also support a Google Product Search URL. -->
  <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="http" android:host="www.google.com" android:path="/m/products
    /scan"/>
  </intent-filter>
  <!-- And the UK version. -->
  <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="http" android:host="www.google.co.uk" android:path="/m
    /products/scan"/>
  </intent-filter>
</activity>

Logcat output after changing my activity to be the launcher:

09-20 12:39:57.527: E/AndroidRuntime(22519): FATAL EXCEPTION: main
09-20 12:39:57.527: E/AndroidRuntime(22519): java.lang.RuntimeException: Unable to 
resume activity 
{com.google.zxing.client.android/com.google.zxing.client.android.Test}: 
java.lang.NullPointerException
09-20 12:39:57.527: E/AndroidRuntime(22519):    at     
android.app.ActivityThread.performResumeActivity(ActivityThread.java:2456)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2484)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1998)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.app.ActivityThread.access$600(ActivityThread.java:127)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.os.Handler.dispatchMessage(Handler.java:99)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.os.Looper.loop(Looper.java:137)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
android.app.ActivityThread.main(ActivityThread.java:4507)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
java.lang.reflect.Method.invokeNative(Native Method)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at  
java.lang.reflect.Method.invoke(Method.java:511)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at   
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at 
dalvik.system.NativeStart.main(Native Method)
09-20 12:39:57.527: E/AndroidRuntime(22519): Caused by: java.lang.NullPointerException
09-20 12:39:57.527: E/AndroidRuntime(22519):    at   
com.google.zxing.client.android.CaptureActivity.onResume(CaptureActivity.java:178)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at   
android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1157)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at  
android.app.Activity.performResume(Activity.java:4539)
09-20 12:39:57.527: E/AndroidRuntime(22519):    at   
android.app.ActivityThread.performResumeActivity(ActivityThread.java:2446)

i just want to know how to make the simple activity i created is the start activity. in other words, where to place the tags of the simple activity in the manifest file of zxing project?

Answer 1

I guess you should remove

<intent-filter>
    <action android:name="android.intent.action.MAIN"/>
    <category android:name="android.intent.category.LAUNCHER"/>
  </intent-filter>

from CaptureActivity in manifest file.
and simply add

<activity
        android:name=".Test"
        android:screenOrientation="portrait"
        android:configChanges = "keyboardHidden|orientation"
        android:label="@string/app_name01" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

after the code part you have shown. I had not tried it. Let me know if it works?