android.view.InflateException：二进制XML文件第15行：错误夸大类<unknown>

Question

当我试图使用新的AppCompatActivity时出现此错误，但仅在较旧的Android API（如16、22或23）中存在。在新的API（如API 26）中，它可以正常工作。 / p>

这是日志：

android.view.InflateException: Binary XML file line #15: Binary XML file line #15: Error inflating class <unknown>
    at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
    at valientes.valientesappv2.Domain.Mensajes.MensajeriaAdapter.onCreateViewHolder(MensajeriaAdapter.java:37)
    at valientes.valientesappv2.Domain.Mensajes.MensajeriaAdapter.onCreateViewHolder(MensajeriaAdapter.java:25)
    at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6519)
    at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5706)
    at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5589)
    at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5585)
    at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2231)
    at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1558)
    at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1518)
    at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:585)
    at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3719)
    at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3436)
    at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3988)
    at android.view.View.layout(View.java:16630)
    at android.view.ViewGroup.layout(ViewGroup.java:5437)
    at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
    at android.view.View.layout(View.java:16630)
    at android.view.ViewGroup.layout(ViewGroup.java:5437)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
    at android.view.View.layout(View.java:16630)
    at android.view.ViewGroup.layout(ViewGroup.java:5437)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
    at android.view.View.layout(View.java:16630)
    at android.view.ViewGroup.layout(ViewGroup.java:5437)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
    at android.view.View.layout(View.java:16630)
    at android.view.ViewGroup.layout(ViewGroup.java:5437)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
    at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)
    at android.view.View.layout(View.java:16630)
    at android.view.ViewGroup.layout(ViewGroup.java:5437)
    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
    at android.view.Choreographer.doCallbacks(Choreographer.java:670)
    at android.view.Choreographer.doFrame(Choreographer.java:606)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: android.view.InflateException: Binary XML file line #15: Error inflating class <u

第三行是引发异常的地方：

@Override
public MensajeriaAdapter.MensajesViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_mensajes,parent,false);
    return new MensajeriaAdapter.MensajesViewHolder(v);
}

这是布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <EditText
            android:id="@+id/eTEsribirMensaje"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Escribe un mensaje..."
            android:layout_alignParentBottom="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_toLeftOf="@+id/bTenviarMensaje"
            android:layout_toStartOf="@+id/bTenviarMensaje" />
        <Button
            android:id="@+id/bTenviarMensaje"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="Enviar"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true" />
        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/appBarLayout"
            android:theme="@style/AppTheme.AppBarOverlay">
            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:navigationIcon="?attr/homeAsUpIndicator"
                >
                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">
                    <ImageView
                        android:id="@+id/ivFoto"
                        android:layout_width="45dp"
                        android:layout_height="45dp"
                        android:src="@mipmap/ic_launcher" />

                    <TextView
                        android:id="@+id/tvTitulo"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_centerVertical="true"
                        android:gravity="center"
                        android:text="Título"
                        android:textSize="25dp"
                        android:textColor="@color/colorWhite"/>
                </RelativeLayout>
            </android.support.v7.widget.Toolbar>
        </android.support.design.widget.AppBarLayout>
        <android.support.v7.widget.RecyclerView
            android:id="@+id/rvMensajes"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            tools:listitem="@layout/card_view_mensajes"
            android:layout_below="@+id/appBarLayout"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_above="@+id/eTEsribirMensaje">
        </android.support.v7.widget.RecyclerView>
    </RelativeLayout>
</LinearLayout>

这是我在布局的Recyclerview中使用的cardViews：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingLeft="5sp"
    android:paddingRight="5sp">
    <android.support.v7.widget.CardView
        android:id="@+id/cvMensaje"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        card_view:cardBackgroundColor="@color/colorWhiteTransparent"
        card_view:cardElevation="0dp">
        <LinearLayout
            android:id="@+id/mensajeBG"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/out_message_bg"
            android:orientation="vertical">
            <TextView
                android:id="@+id/msTexto"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:maxWidth="240sp"
                android:text="hola, qué tal?" />
            <TextView
                android:id="@+id/msHora"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="12:00 pm"
                android:textAppearance="?android:attr/textAppearanceSmall"/>
        </LinearLayout>
    </android.support.v7.widget.CardView>
</RelativeLayout>

适配器类：

public class MensajeriaAdapter extends RecyclerView.Adapter<MensajeriaAdapter.MensajesViewHolder> {

private List<MensajeDeTexto> mensajeDeTextos;
private Context context;

public MensajeriaAdapter(List<MensajeDeTexto> mensajeDeTextos, Context context) {
    this.mensajeDeTextos = mensajeDeTextos;
    this.context = context;
}

@Override
public MensajeriaAdapter.MensajesViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_mensajes,parent,false);
    return new MensajeriaAdapter.MensajesViewHolder(v);
}

@Override
public void onBindViewHolder(MensajeriaAdapter.MensajesViewHolder holder, int position) {

    RelativeLayout.LayoutParams rl = (RelativeLayout.LayoutParams) holder.cardView.getLayoutParams();
    FrameLayout.LayoutParams fl = (FrameLayout.LayoutParams) holder.mensajeBG.getLayoutParams();

    LinearLayout.LayoutParams llMensaje = (LinearLayout.LayoutParams) holder.TvMensaje.getLayoutParams();
    LinearLayout.LayoutParams llHora = (LinearLayout.LayoutParams) holder.TvHora.getLayoutParams();

    if(mensajeDeTextos.get(position).getTipoMensaje()==1){//EMISOR
        holder.mensajeBG.setBackgroundResource(R.drawable.in_message_bg);
        rl.addRule(RelativeLayout.ALIGN_PARENT_LEFT,0);
        rl.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        llMensaje.gravity = Gravity.RIGHT;
        llHora.gravity = Gravity.RIGHT;
        fl.gravity = Gravity.RIGHT;
        holder.TvMensaje.setGravity(Gravity.RIGHT);
    }else if(mensajeDeTextos.get(position).getTipoMensaje()==2){//RECEPTOR
        holder.mensajeBG.setBackgroundResource(R.drawable.out_message_bg);
        rl.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,0);
        rl.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        llMensaje.gravity = Gravity.LEFT;
        llHora.gravity = Gravity.LEFT;
        fl.gravity = Gravity.LEFT;
        holder.TvMensaje.setGravity(Gravity.LEFT);
    }

    holder.cardView.setLayoutParams(rl);
    holder.mensajeBG.setLayoutParams(fl);
    holder.TvMensaje.setLayoutParams(llMensaje);
    holder.TvHora.setLayoutParams(llHora);

    holder.TvMensaje.setText(mensajeDeTextos.get(position).getMensaje());
    holder.TvHora.setText(mensajeDeTextos.get(position).getHoraDelMensaje());
    if(android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) holder.cardView.getBackground().setAlpha(0);
    else holder.cardView.setBackgroundColor(ContextCompat.getColor(context,android.R.color.transparent));
}

@Override
public int getItemCount() {
    return mensajeDeTextos.size();
}

static class MensajesViewHolder extends RecyclerView.ViewHolder{

    CardView cardView;
    LinearLayout mensajeBG;
    TextView TvMensaje;
    TextView TvHora;

    MensajesViewHolder(View itemView){
        super(itemView);
        cardView = (CardView) itemView.findViewById(R.id.cvMensaje);
        mensajeBG = (LinearLayout) itemView.findViewById(R.id.mensajeBG);
        TvMensaje = (TextView) itemView.findViewById(R.id.msTexto);
        TvHora = (TextView) itemView.findViewById(R.id.msHora);
    }
}

}

有人知道可能是什么问题吗？

Answer 1

尝试parent.getApplicationContext（）

Answer 2

您的适配器类中已经有一个上下文。那为什么要尝试从父视图获取上下文呢？

尝试

View v = LayoutInflater.from(context).inflate(R.layout.card_view_mensajes,parent,false);
    return new MensajeriaAdapter.MensajesViewHolder(v);

代替

View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_mensajes,parent,false);
    return new MensajeriaAdapter.MensajesViewHolder(v);

另一个：请尝试在布局背景上使用纯色而不是使用android:background="@drawable/out_message_bg"。

Answer 3

我遇到了同样的问题，因为我在项目 xml 中设置了 backgroundTint = ?attr/item_color 但我在主题（夜间）中没有这个颜色参数。添加此颜色修复了错误