java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rt.droid.rellayoutjava/com.rt.droid.rellayoutjava.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'int android.view.ViewGroup$LayoutParams.width' on a null object reference

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Root Cause Analysis

  1. java.lang.NullPointerException

    Attempt to read from field 'int android.view.ViewGroup$LayoutParams.width' on a null object reference

    at android.view.ViewGroup$LayoutParams.<init>()
  2. Android Platform
    ViewGroup.addView
    1. android.view.ViewGroup$LayoutParams.<init>(ViewGroup.java:6403)
    2. android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:6685)
    3. android.widget.RelativeLayout$LayoutParams.<init>(RelativeLayout.java:1345)
    4. android.widget.RelativeLayout.generateLayoutParams(RelativeLayout.java:1104)
    5. android.view.ViewGroup.addViewInner(ViewGroup.java:3889)
    6. android.view.ViewGroup.addView(ViewGroup.java:3733)
    7. android.view.ViewGroup.addView(ViewGroup.java:3709)
    7 frames
  3. com.rt.droid
    MainActivity.onCreate
    1. com.rt.droid.rellayoutjava.MainActivity.onCreate(MainActivity.java:24)
    1 frame
  4. Android Platform
    ActivityThread.performLaunchActivity
    1. android.app.Activity.performCreate(Activity.java:5933)
    2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
    3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
    3 frames