在android中创建自定义列表视图
我想在android studio中为列表视图设置自定义布局 我在activity_main.xml文件中添加了一个列表视图在android中创建自定义列表视图,android,Android,我想在android studio中为列表视图设置自定义布局 我在activity_main.xml文件中添加了一个列表视图 <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" /> } 运行应用程序时，显示：很遗憾，应用程序已停止 如何解决这个问题 错
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.nik.myapplication.MainActivity$MyAdapter.getView(MainActivity.java:57)
at android.widget.AbsListView.obtainView(AbsListView.java:2207)
at android.widget.ListView.makeAndAddView(ListView.java:1845)
at android.widget.ListView.fillDown(ListView.java:678)
at android.widget.ListView.fillFromTop(ListView.java:739)
at android.widget.ListView.layoutChildren(ListView.java:1661)
at android.widget.AbsListView.onLayout(AbsListView.java:2037)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:985)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:435)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14118)
at android.view.ViewGroup.layout(ViewGroup.java:4474)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2183)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1947)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4879)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
at android.view.Choreographer.doCallbacks(Choreographer.java:579)
at android.view.Choreographer.doFrame(Choreographer.java:548)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5341)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:929)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
at dalvik.system.NativeStart.main(Native Method)
@Override
public View getView(int position , View convertView , ViewGroup parent){
LayoutInflater layoutInflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = layoutInflater.inflate(R.layout.row,null,true);
ImageView images = (ImageView) row.findViewById(R.id.icon);
TextView myTitle = (TextView) row.findViewById(R.id.text1);
TextView myDescription = (TextView) row.findViewById(R.id.text2);
images.setImageResource(imgs[position]);
myTitle.setText(titles[position]);
myDescription.setText(description[position]);
return row;
}
@Override
public View getView(int position , View convertView , ViewGroup parent){
LayoutInflater layoutInflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = layoutInflater.inflate(R.layout.row,null,true);
ImageView images = (ImageView) row.findViewById(R.id.icon);
TextView myTitle = (TextView) row.findViewById(R.id.text1);
TextView myDescription = (TextView) row.findViewById(R.id.text2);
images.setImageResource(imgs[position]);
myTitle.setText(titles[position]);
myDescription.setText(description[position]);
return row;
}
希望有帮助 请显示错误日志无法确定是否发布了错误日志，但只显示一个：而不是ImageView images=（ImageView）findViewById（R.id.icon）；您应该像这样尝试从行视图中找到它：ImageView images=（ImageView）ROW.findviewbyd（R.id.icon）；添加了错误日志…我已经编辑了我的评论，并为您的问题提供了解决方案！空指针异常使诊断变得更容易，感谢您添加了错误日志！谢谢，我在findViewById之前添加了视图，但是得到了以下错误：错误：（54,48）错误：不能从静态上下文引用非静态方法findViewById（int）。哎呀，我写的是视图而不是行。请使用我刚刚编辑并放在那里的代码再试一次。问题是我在应该是row.findviewbyd时编写了view.findviewbyd。我的错！令人惊叹的！祝你将来好运！
@Override
public View getView(int position , View convertView , ViewGroup parent){
LayoutInflater layoutInflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = layoutInflater.inflate(R.layout.row,null,true);
ImageView images = (ImageView) row.findViewById(R.id.icon);
TextView myTitle = (TextView) row.findViewById(R.id.text1);
TextView myDescription = (TextView) row.findViewById(R.id.text2);
images.setImageResource(imgs[position]);
myTitle.setText(titles[position]);
myDescription.setText(description[position]);
return row;
}