Question

我正在开发一个Android项目，我正在创建一个自定义列表视图。列表视图包含多个文本视图，我正在为文本视图创建样式，因此我无法一遍又一遍地复制相同的样式。

以下是我的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView android:id="@+id/txtFirstOccurred"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        style="@style/CrashGroup"/>

    <TextView android:id="@+id/txtLastOccurred"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        style="@style/CrashGroup"/>
</LinearLayout>

以下是我的textview

的样式

<style name="CrashGroup">
        <item name="android:singleLine">false</item>
        <item name="android:textSize">@android:style/TextAppearance.Small</item>
        <item name="android:gravity">center_vertical</item>
    </style>

下面是我如何夸大我的XML以显示在列表视图中。

@Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        try
        {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.android_crash_group_layout, null);

            TextView txtFirstOccurred = (TextView)convertView.findViewById(R.id.txtFirstOccurred);
            txtFirstOccurred.setText(getItem(position).getFirstOccurred());

            TextView txtLastOccurred = (TextView)convertView.findViewById(R.id.txtLastOccurred);
            txtLastOccurred.setText(getItem(position).getLastOccurred());


            return convertView;
        }
        catch (Exception ex)
        {
            Log.e(TAG, ex.toString());
            return null;
        }
    }

我得到的错误是：

流程：com.BoardiesITSolutions.CritiMonApp，PID：1451 java.lang.NullPointerException：尝试调用虚方法＆＃39; int android.view.View.getImportantForAccessibility（）＆＃39;在null 对象参考在android.widget.AbsListView.obtainView（AbsListView.java:2360）在android.widget.ListView.makeAndAddView（ListView.java:1864）在android.widget.ListView.fillDown（ListView.java:698）在android.widget.ListView.fillFromTop（ListView.java:759）在android.widget.ListView.layoutChildren（ListView.java:1673）在android.widget.AbsListView.onLayout（AbsListView.java:2148）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1703）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1557）在android.widget.LinearLayout.onLayout（LinearLayout.java:1466）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1703）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1557）在android.widget.LinearLayout.onLayout（LinearLayout.java:1466）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:573）在android.widget.FrameLayout.onLayout（FrameLayout.java:508）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:573）在android.widget.FrameLayout.onLayout（FrameLayout.java:508）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1703）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1557）在android.widget.LinearLayout.onLayout（LinearLayout.java:1466）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.support.v4.widget.DrawerLayout.onLayout（DrawerLayout.java:890）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:573）在android.widget.FrameLayout.onLayout（FrameLayout.java:508）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:573）在android.widget.FrameLayout.onLayout（FrameLayout.java:508）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:573）在android.widget.FrameLayout.onLayout（FrameLayout.java:508）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1703）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1557）在android.widget.LinearLayout.onLayout（LinearLayout.java:1466）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:573）在android.widget.FrameLayout.onLayout（FrameLayout.java:508）在android.view.View.layout（View.java:15596）在android.view.ViewGroup.layout（ViewGroup.java:4966）在android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2072）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1829）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1054）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:5779）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:767）在android.view.Choreographer.doCallbacks（Choreographer.java:580）在android.view.Choreographer.doFrame（Choreographer.java:550）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:753）

这似乎与样式有关，好像我从文本视图中删除了这个样式属性似乎工作正常。

Answer 1

我认为你返回的convertView有时候是null，因为处理convertView很棘手。

确保您有值。您可以使用smth：

 @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    TextView text = null;

    if (convertView == null) {
      convertView = inflater.inflate(R.layout.listrow_details, null);
    }

    text = (TextView) convertView.findViewById(R.id.textView1);
    text.setText(children);

    return convertView;
  }

希望它有所帮助。

Answer 2

android：textSize必须是尺寸值所以改变你的风格，

<style name="CrashGroup" parent="@android:style/TextAppearance.Small">
        <item name="android:singleLine">false</item>
        <item name="android:gravity">center_vertical</item>
    </style>

具有自定义样式的TextView导致奇怪的膨胀异常

2 个答案: