标签：widget java 错误信息 Studio Android View com android view
今天遇到一个简单的错误信息提示，特记录如下，方便日后查找：
错误信息一：
2020-02-02 13:27:48.472 20534-20534/com.example.helloworld1 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.helloworld1, PID: 20534
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.helloworld1/com.example.helloworld1.gridview.GridViewActivity}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1827)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1531)
at android.app.Activity.startActivityForResult(Activity.java:4405)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:767)
at android.app.Activity.startActivityForResult(Activity.java:4363)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:754)
at android.app.Activity.startActivity(Activity.java:4702)
at android.app.Activity.startActivity(Activity.java:4670)
at com.example.helloworld1.MainActivity$Onclick.onClick(MainActivity.java:108)
at android.view.View.performClick(View.java:5642)
at android.view.View$PerformClick.run(View.java:22485)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6211)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:793)
该错误信息中的 ***have you declared this activity in your AndroidManifest.xml?***明确指出“在 AndroidManifest.xml 文件中没有声明相关activity”
修改如下：
在 AndroidManifest.xml 文件中 添加相关activity即可
<activity android:name=".gridview.GridViewActivity"></activity>
错误信息二：
2020-02-02 16:14:15.819 16410-16410/com.example.helloworld1 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.helloworld1, PID: 16410
java.lang.NullPointerException: Argument must not be null
at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:31)
at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:25)
at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java:651)
at com.example.helloworld1.gridview.MyGridViewAdapter.getView(MyGridViewAdapter.java:68)
at android.widget.AbsListView.obtainView(AbsListView.java:2486)
at android.widget.GridView.onMeasure(GridView.java:1065)
at android.view.View.measure(View.java:19913)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6247)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19913)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6247)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:19913)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6247)
at androidx.appcompat.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:401)
at android.view.View.measure(View.java:19913)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6247)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19913)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6247)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19913)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6247)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:759)
at android.view.View.measure(View.java:19913)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2279)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1370)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1623)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1258)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6468)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:908)
at android.view.Choreographer.doCallbacks(Choreographer.java:720)
at android.view.Choreographer.doFrame(Choreographer.java:655)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:894)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6211)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:793)
2020-02-02 16:14:15.849 16410-16410/? I/Process: Sending signal. PID: 16410 SIG: 9
每次都是进入当前页面程序就崩溃，界面闪退，
当注释掉网络图片部分即可运行成功。
各种尝试后，发现其实问题很简单，当前页面 imageView 所对应的关联 id 取错了
//错误id：
holder.imageView = (ImageView) convertView.findViewById(R.id.iv_item);
//正确id：
holder.imageView = (ImageView) convertView.findViewById(R.id.iv_grid);
小结：
Android Studio 中 不同的layout布局文件 id名称可重复使用，但每个layout布局文件中的id不能重复，并且在 Activity.java 文件中一定要取对应的布局文件中的相关控件id，否则可能会导致程序崩溃、闪退等错误。
smart_reed
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标签：widget,java,错误信息,Studio,Android,View,com,android,view 来源： https://blog.csdn.net/smart_reed/article/details/104146185
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