关于安卓被开发中出现java.lang.RuntimeException: Unable to start activity ComponentInfo
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12-12 11:28:58.341: E/AndroidRuntime(1118): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.callpeople/com.example.callpeople.MainActivity}: java.lang.NullPointerException
<Button
android:name="@+id/Button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/button4"
/>
就是这一个错误折腾了一下午 注意是android:id 不是name
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