小编Ahm*_*beh的帖子

我试图实现这样的目标，我以这种方式在 xml 中使用了图层列表：

<item>
    <shape android:shape="rectangle" >
        <gradient

            android:centerColor="#4DD0E1"
            android:endColor="#76FF03"

            android:startColor="@color/colorPrimary"
            android:type="linear" />


    </shape>
</item>

<item
    android:bottom="2dp"
    android:left="2dp"
    android:right="2dp"
    android:top="2dp">


    <shape android:shape="rectangle" >

        <solid android:color="#fff" />
    </shape>
</item>

这里是布局代码，形状的边框需要与图像重叠。

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_marginTop="12dp"
        android:background="@android:color/transparent">


        <ImageView
            android:layout_width="100dp"
            android:layout_height="75dp"
            android:layout_centerVertical="true"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_marginRight="12dp"
            android:id="@+id/goals_image" />


        <FrameLayout
            android:id="@+id/goals_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"

            android:layout_gravity="center"
            android:clickable="true"

            android:layout_marginLeft="20dp"
            android:layout_marginRight="32dp"
            android:background="#00000000"
            >


            <TextView
                android:id="@+id/goals_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="15dp"
                android:text="Lose Weight"
                android:textColor="@color/black"
                android:layout_margin="40dp"

                />


        </FrameLayout>

    </RelativeLayout>

但是如果我将背景设置为透明，则形状背景就会变成整个渐变色。如何实现具有透明背景的渐变笔触？提前致谢。

我正在尝试将文本设置到EditText我的自定义适配器内部，并且我得到了这个堆栈：

java.lang.NullPointerException: Attempt to read from field 'android.support.v7.widget.ViewInfoStore android.support.v7.widget.RecyclerView.mViewInfoStore' on a null object reference
    at android.support.v7.widget.RecyclerView$LayoutManager.addViewInt(RecyclerView.java:8194)
    at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:8180)
    at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:8168)
    at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1573)
    at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
    at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
    at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
    at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3225)
    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.widget.ScrollView.measureChildWithMargins(ScrollView.java:1260)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
    at android.widget.ScrollView.onMeasure(ScrollView.java:337)
    at android.view.View.measure(View.java:17547)
    at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:1676)
    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:141)
    at android.view.View.measure(View.java:17547)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
    at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:400)
    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) …