[已解决]: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4

时间 2019-12-05

标签解决 java.lang.nullpointerexception java lang nullpointerexception attempt invoke virtual method void android.support.v4 android support 栏目 Java 繁體版

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今天开发的时候，发现明明有这个id，并且也经过findviewbyid获取了，可是为何最后获得viewpager 是空呢？java Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android

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1. Attempt to invoke virtual method 'void android.support.v4.app.Fragment.setNextAnim(int)'
2. java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourcePa
3. java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAd
4. java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setTe
5. java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object
6. Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerViewLayoutManager.onMeasur
7. java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.content
8. Attempt to invoke virtual method 'void android.view.ViewGroup.transformMatrixToGlobal(android.graphi
9. java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(ja
10. java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportant
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1. Attempt to invoke virtual method 'void android.support.v4.app.Fragment.setNextAnim(int)'
2. java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourcePa
3. java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAd
4. java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setTe
5. java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object
6. Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerViewLayoutManager.onMeasur
7. java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.content
8. Attempt to invoke virtual method 'void android.view.ViewGroup.transformMatrixToGlobal(android.graphi
9. java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(ja
10. java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportant

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