我在我的应用程序中实现了一个简单的自定义视图,但在尝试使用它时,我总是遇到此运行时错误:
java.lang.RuntimeException: Unable to start activity ...
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class EmptyReviewView
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class EmptyReviewView
Caused by: java.lang.reflect.InvocationTargetException
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: You must supply a layout_width attribute.
引发者:java.lang.UnsupportedOperationException:二进制XML文件行#0:您必须提供layout_width属性。
我寻找任何缺少layout_width但没有找到任何。这是我的自定义视图的XML:
<?xml version="1.0" encoding="utf-8"?>
<merge 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:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:parentTag="android.widget.LinearLayout">
<ImageView
android:layout_width="68dp"
android:layout_height="68dp"
android:layout_marginBottom="6dp"
android:layout_marginTop="24dp"
android:scaleType="fitCenter"
app:srcCompat="@drawable/ic_review_hand_stars" />
<TextView
style="@style/TextGuide.Body.1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="4dp"
android:layout_marginTop="6dp"
android:gravity="center"
android:text="@string/no_reviews_yet"
android:textAppearance="@style/TextGuide.Body.1"
android:textColor="@color/fib_color_grey_6" />
<TextView
style="@style/TextGuide.Body.1"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="24dp"
android:layout_marginTop="4dp"
android:gravity="center"
android:text="@string/be_the_first_one_to_review_this_item"
android:textAppearance="@style/TextGuide.Body.1"
android:textColor="@color/fib_color_grey_5" />
<TextView />
</merge>
这是自定义视图的类:
public class EmptyReviewView extends LinearLayout {
public EmptyReviewView(Context context) {
this(context, null, 0);
}
public EmptyReviewView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public EmptyReviewView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public EmptyReviewView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
initView();
}
private void initView() {
LayoutInflater.from(getContext()).inflate(R.layout.view_review_empty, this, true);
setOrientation(VERTICAL);
setGravity(Gravity.CENTER);
}
}
这就是我在Fragments / Activities布局中使用它的方式:
<EmptyReviewView
android:id="@+id/no_ratings_view"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
甚至可以在布局预览中正确显示该内容,但是一旦显示片段,应用程序就会崩溃。从片段中注释掉视图会使它工作,所以这绝对是个问题:
在你的布局中,在最后一个TextView
之后你有这个<TextView />
。删除它然后应用程序将正确运行。