我正在使用一个 simplecursortreeadapter 来适应从外部 sqlite 数据库到可扩展 ListView 的数据检索。我正在使用取景器来调整 View 。添加第三个 bloc(glide 在其中)之前的应用程序运行良好..但是在添加 bloc 之后..应用程序停止了。
public class MyViewBinder implements SimpleCursorTreeAdapter.ViewBinder {
@Override
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
int viewID = view.getId();
switch(viewID){
case R.id.group1 :
TextView groupName = (TextView) view;
String groupname;
groupname = cursor.getString(cursor.getColumnIndex(Database.DATABASE_GROUP_1));
groupName.setText(groupname);
break;
case R.id.child1 :
TextView friendName = (TextView) view;
String friend_name;
friend_name = cursor.getString(cursor.getColumnIndex(Database.DATABASE_CHILD_1));
friendName.setText(friend_name);
break;
case R.id.child2 :
ImageView contactProfile = (ImageView) view;
byte[] imageBytes = cursor.getBlob(cursor.getColumnIndex(Database.DATABASE_CHILD_2));
if(imageBytes != null ){
// Pic image from database
contactProfile.setImageBitmap(BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length));
}else {
// If image not found in database , assign a default image
contactProfile.setBackgroundResource(0);
}
break;
case R.id.child3 :
String urls;
urls = cursor.getString(cursor.getColumnIndex(Database.DATABASE_CHILD_3));
ImageView url=findViewById(R.id.child3);
Glide.with(MainActivity.this).load(urls).into(url);
break;
}
return true;
}
构建成功并且应用程序打开但是当我点击某些东西时应用程序停止..这是我的错误消息:
08-01 18:40:20.512 4772-4772/ma.ac.iav.databasewithjava D/AndroidRuntime: Shutting down VM
08-01 18:40:20.585 4772-4772/ma.ac.iav.databasewithjava E/AndroidRuntime: FATAL EXCEPTION: main
Process: ma.ac.iav.databasewithjava, PID: 4772
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 ma.ac.iav.databasewithjava.MainActivity$MyViewBinder.setViewValue(MainActivity.java:99)
at android.widget.SimpleCursorTreeAdapter.bindView(SimpleCursorTreeAdapter.java:220)
at android.widget.SimpleCursorTreeAdapter.bindChildView(SimpleCursorTreeAdapter.java:254)
at android.widget.CursorTreeAdapter.getChildView(CursorTreeAdapter.java:251)
at android.widget.ExpandableListConnector.getView(ExpandableListConnector.java:451)
at android.widget.AbsListView.obtainView(AbsListView.java:2372)
at android.widget.ListView.makeAndAddView(ListView.java:2052)
at android.widget.ListView.fillDown(ListView.java:786)
at android.widget.ListView.fillSpecific(ListView.java:1494)
at android.widget.ListView.layoutChildren(ListView.java:1790)
at android.widget.AbsListView.onLayout(AbsListView.java:2171)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:758)
at android.view.View.layout(View.java:19590)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2484)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2200)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1386)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6733)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:658)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
这是我正在使用的版本:
implementation 'com.github.bumptech.glide:glide:4.7.1'
annotationProcessor 'com.github.bumptech.glide:compiler:4.7.1'
最佳答案
崩溃原因:
ImageView url=findViewById(R.id.child3);
Glide.with(MainActivity.this).load(urls).into(url);
因为url为空； 检查你的“R.id.child3”
关于android - java.lang.NullPointerException : Argument must not be null at com. bumptech.glide.util，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51640394/