空对象引用上的'int android.view.View.getVisibility()' [英] 'int android.view.View.getVisibility()' on a null object reference
本文介绍了空对象引用上的'int android.view.View.getVisibility()'的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用recyclerview并突然收到一个奇怪的错误.我已经尽力了.甚至放置了断点.但它无法到达任何地方.数组列表中有数据.我已经尝试了StackOverFlow上所有可用的解决方案.它仍然不起作用，并且可用的解决方案也适用于ListView.我正在使用recycerview，所以我无法获得解决方案.没有空值. 我的回收站适配器如下:
I am using recyclerview and suddenly getting a weird error. I have tried everything that i could. Even placed Breakpoint. but it does not reach anywhere. There is data in the arraylist. I have tried all the solution that is available on StackOverFlow. It still does not work and also the solution available are for ListView. I am using recycerview so I am unable to get the solution. There is no null value. My recycler adapter is as below:
private class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHolders> {
private Context context;
private ArrayList<Integer> arrayTarget = new ArrayList<>();
private ArrayList<Integer> arrayAchievements = new ArrayList<>();
private ArrayList<String> arrayAssociateName = new ArrayList<>();
private ArrayList<String> arrayUserType = new ArrayList<>();
private ArrayList<Integer> arrayAchievedGrp = new ArrayList<>();
public RecyclerAdapter(Context c, ArrayList<Integer> arrayTarget,
ArrayList<String> arrayAssociateName, ArrayList<Integer> arrayAchievements,
ArrayList<String> arrayUserType, ArrayList<Integer> arrayAchievedGrp) {
this.context = c;
this.arrayTarget = arrayTarget;
this.arrayAchievements = arrayAchievements;
this.arrayAssociateName = arrayAssociateName;
this.arrayUserType = arrayUserType;
this.arrayAchievedGrp = arrayAchievedGrp;
}
@Override
public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {
View layout = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row_associates_list, parent, false);
return new RecyclerViewHolders(layout);
}
//this will attach the row at different positions
@Override
public void onBindViewHolder(RecyclerViewHolders mHolder, final int pos) {
mHolder.tv_AssociateName.setText(arrayAssociateName.get(pos).toUpperCase());
mHolder.tv_target.setText(String.valueOf(arrayTarget.get(pos)));
mHolder.tv_achievements.setText(String.valueOf(arrayAchievements.get(pos)));
mHolder.tv_AssociateType.setText(" ( " + arrayUserType.get(pos) + " )");
mHolder.tv_achievedSraGrp.setText(String.valueOf(arrayAchievedGrp.get(pos)));
try {
percentage = (arrayAchievements.get(pos) * 100) / arrayTarget.get(pos);
if (percentage > 100) {
percentage = 100;
}
} catch (Exception e) {
e.printStackTrace();
percentage = 0;
}
arrayPercentage.add(percentage);
mHolder.tv_percentage.setText(String.valueOf(percentage) + "%");
}
@Override
public int getItemCount() {
return arrayAssociateName.size();
}
}
public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView tv_AssociateName, tv_target, tv_achievements, tv_percentage, tv_AssociateType, tv_achievedSraGrp;
ImageButton ib_alertButton;
LinearLayout LL_achievedGrp;
public RecyclerViewHolders(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
tv_AssociateName = (TextView) itemView.findViewById(R.id.tv_AssociateName);
tv_target = (TextView) itemView.findViewById(R.id.tv_target);
tv_achievements = (TextView) itemView.findViewById(R.id.tv_achievements);
tv_percentage = (TextView) itemView.findViewById(R.id.tv_percentage);
tv_AssociateType = (TextView) itemView.findViewById(R.id.tv_AssociateType);
tv_achievedSraGrp = (TextView) itemView.findViewById(R.id.tv_achievedSraGrp);
LL_achievedGrp = (LinearLayout) itemView.findViewById(R.id.LL_achievedGrp);
ib_alertButton = (ImageButton) itemView.findViewById(R.id.ib_alertButton);
ib_alertButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Coming Soon..", Toast.LENGTH_LONG).show();
}
});
if (mainUserType.equalsIgnoreCase("ASE")) {
LL_achievedGrp.setVisibility(View.VISIBLE);
} else {
LL_achievedGrp.setVisibility(View.GONE);
}
}
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), AssociatesDashboard.class);
intent.putExtra("empCode", arrayAssociateEmpCd.get(getLayoutPosition())); //to open dashboard for this user
intent.putExtra("strActivityName", ActivityConstant.ASSOCIATE_LIST);
intent.putExtra("userType", callingUser);
}
}
构造函数被调用.但是随后在没有任何位置的情况下得到错误. LogCat如下:
The constructor is called. But then getting the error without any location. LogCat as below:
FATAL EXCEPTION: main
Process: com.mapmymarketing.salesscope, PID: 24220
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference
at android.widget.LinearLayout.forceUniformHeight(LinearLayout.java:1380)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1368)
at android.widget.TableRow.onMeasure(TableRow.java:114)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.TableLayout.measureChildBeforeLayout(TableLayout.java:464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.TableLayout.measureVertical(TableLayout.java:476)
at android.widget.TableLayout.onMeasure(TableLayout.java:439)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.support.v7.widget.CardView.onMeasure(CardView.java:211)
at android.view.View.measure(View.java:17547)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:706)
at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1364)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:771)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.view.View.measure(View.java:17547)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1085)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615)
at android.view.View.measure(View.java:17547)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.vi
这是回收站适配器行的XML:
This is the XML of recycler adapter row:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/ll_card"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:background="@color/white"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:id="@+id/CardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:paddingBottom="20dp"
android:paddingTop="20dp"
app:cardElevation="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_AssociateName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:text="Swaroop Pandey"
android:textColor="@color/black"
android:textSize="15sp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_AssociateType"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:text="SO"
android:textColor="@color/PrimaryDark2"
android:textSize="15sp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_percentage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:gravity="end"
android:text="50 %"
android:textColor="@color/pink"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:layout_marginTop="5dp"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="Target - "
android:textColor="@color/black"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_target"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:text="10000"
android:textColor="@color/PrimaryDark2"
android:textSize="15sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Achievements - "
android:textColor="@color/black"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_achievements"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:text="5000"
android:textColor="@color/PrimaryDark2"
android:textSize="15sp" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp">
<LinearLayout
android:id="@+id/LL_achievedGrp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="Achieved SRA Group - "
android:textColor="@color/black"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_achievedSraGrp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
android:textColor="@color/PrimaryDark2"
android:textSize="15sp" />
</LinearLayout>
<ImageButton
android:id="@+id/ib_alertButton"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:background="@drawable/alert" />
</RelativeLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
这是包含TableRow布局的布局(主布局)
This is the Layout (main layout) which contains TableRow layout
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v7.widget.CardView
android:id="@+id/cardView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="5dp"
app:cardBackgroundColor="@color/background">
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp">
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:src="@drawable/blue_ring" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_weight="3.5"
android:text="Total Associates"
android:textColor="@color/white"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_totalTarget"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_column="3"
android:layout_weight="1"
android:gravity="end|center"
android:text="3000"
android:textColor="@color/white"
android:textSize="15sp" />
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_column="4"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:gravity="end|center"
android:text="100%"
android:textColor="#8b8ce6"
android:textSize="15sp" />
</TableRow>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginBottom="5dp"
android:layout_marginTop="10dp"
android:background="#30ffffff" />
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:src="@drawable/green_ring" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_weight="3.5"
android:text="Associate achieved upto 5 group"
android:textColor="@color/white"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_totalAchievements"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_column="3"
android:layout_weight="1"
android:gravity="end|center"
android:text="1500"
android:textColor="@color/Primary"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_achievementsPercentage"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_column="4"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:gravity="end|center"
android:text="50%"
android:textColor="#51e4ca"
android:textSize="15sp" />
</TableRow>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginBottom="5dp"
android:layout_marginTop="10dp"
android:background="#30ffffff" />
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:src="@drawable/orange_ring" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_weight="3.5"
android:text="Associates achieved less than 5 group"
android:textColor="@color/white"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_totalGap"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_column="3"
android:layout_weight="1"
android:gravity="end|center"
android:text="1500"
android:textColor="@color/Primary"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_gapPercentage"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_column="4"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:gravity="end|center"
android:text="50%"
android:textColor="#ed9178"
android:textSize="15sp" />
</TableRow>
</TableLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.RecyclerView
android:id="@+id/AssociateList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/cardView2"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp" />
<TextView
android:id="@+id/no_data_available"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/cardView2"
android:layout_gravity="center"
android:gravity="center"
android:padding="10dp"
android:text="No Data Available"
android:textColor="@color/white"
android:visibility="gone" />
</RelativeLayout>
推荐答案
我遇到了同样的问题，我只删除了android:layout_column=""，它起作用了.我不知道背后的原因
I had the same problem and i only removed the android:layout_column="", and it worked .Reason behind i don't know
这篇关于空对象引用上的'int android.view.View.getVisibility()'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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