我面临一个问题。
我创建了一个自定义布局。
我需要在单击可扩展布局时展开和折叠这些子视图。我如何为这个示例应用程序中的所有可扩展视图执行此操作。
我只想在可扩展视图中添加子项，不能使用活动来设置子项，所有内容都将在我的 ExpandableView 类中。
//带有自定义布局的myactivity布局
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res/com.example.customview"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<com.example.customview.ExpandableView
android:id="@+id/ex_view1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
custom:buttonTitle="Details"
custom:title="All staff Details"
custom:visibility="@integer/visible"
android:orientation="vertical">
</com.example.customview.ExpandableView>
<com.example.customview.ExpandableView
android:id="@+id/ex_view2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
custom:title="Next coming"
custom:visibility="@integer/gone" />
<com.example.customview.ExpandableView
android:id="@+id/ex_view3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
custom:title="Previous record"
custom:visibility="@integer/gone" />
<com.example.customview.ExpandableView
android:id="@+id/ex_view4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
custom:buttonTitle="Next"
custom:title="New News"
custom:visibility="@integer/visible" />
</LinearLayout>
</ScrollView>
// 主布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/parent_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#AAABAB"
android:orientation="horizontal" >
<TextView
android:id="@+id/tv_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:paddingBottom="15dp"
android:paddingTop="15dp"
android:textSize="18sp"
android:textStyle="bold" />
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="#B7B7B8"
android:drawableLeft="@drawable/ic_menu_edit"
android:paddingRight="5dp" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="5dp" />
</LinearLayout>
//代码
public class ExpandableView extends LinearLayout
{
TextView textView;
Button button;
LinearLayout parentLinear,childLinear;
View view,convertView;
Context context;
WebView web;
LayoutInflater inflater ;
View viewLay ;
/**
* Constructor
* @param context
* @param attr
*/
public ExpandableView(final Context context,AttributeSet attr)
{
super(context,attr);
this.context = context;
inflate(context,R.layout.mainlayout, this);
textView =(TextView)findViewById(R.id.tv_text);
button = (Button)findViewById(R.id.btn);
parentLinear =(LinearLayout)findViewById(R.id.parent_id);
getAttributes(attr);
//setChildView();
}
public void setChildView()
{
web = (WebView)findViewById(R.id.webview);
web.loadUrl("file:///android_asset/info.html");
}
/**
* function to get attributes from attrs.xml
* @param attr
*/
public void getAttributes(AttributeSet attr)
{
TypedArray attributes = context.obtainStyledAttributes(attr,R.styleable.MyCustomWidget);
String textTitle = attributes.getString(R.styleable.MyCustomWidget_title);
textView.setText(textTitle);
String textButtonTitle = attributes.getString(R.styleable.MyCustomWidget_buttonTitle);
button.setText(textButtonTitle);
int visibility = attributes.getInteger(R.styleable.MyCustomWidget_visibility, 0);
button.setVisibility(visibility);
attributes.recycle();
}
}
现在我需要在里面添加一个网络视图custom layout，所以我这样做
<com.example.customview.ExpandableView
android:id="@+id/ex_view1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
custom:buttonTitle="Details"
custom:title="All staff Details"
custom:visibility="@integer/visible"
android:orientation="vertical">
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</com.example.customview.ExpandableView>
问题案例1：-
如果我在活动中设置这个子 webview，它工作正常。即
//活动类
expandableOne = (ExpandableView)findViewById(R.id.ex_view1);
expandableOne.setChildView();
但我不想让这个孩子参加活动。
案例2：-
我想在ExpandableView课堂上设置这个
所以我在构造函数中调用这个方法。
setChildview();//这是在构造函数中
并expandableOne.setChildView();从activity课堂上删除它....现在它崩溃了
我的日志猫
05-03 11:07:29.364: E/AndroidRuntime(1336): FATAL EXCEPTION: main
05-03 11:07:29.364: E/AndroidRuntime(1336): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.customview/com.example.customview.ExpandableActivity}: android.view.InflateException: Binary XML file line #12: Error inflating class com.example.customview.ExpandableView
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.ActivityThread.access$600(ActivityThread.java:123)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.os.Handler.dispatchMessage(Handler.java:99)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.os.Looper.loop(Looper.java:137)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.ActivityThread.main(ActivityThread.java:4424)
05-03 11:07:29.364: E/AndroidRuntime(1336): at java.lang.reflect.Method.invokeNative(Native Method)
05-03 11:07:29.364: E/AndroidRuntime(1336): at java.lang.reflect.Method.invoke(Method.java:511)
05-03 11:07:29.364: E/AndroidRuntime(1336): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-03 11:07:29.364: E/AndroidRuntime(1336): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-03 11:07:29.364: E/AndroidRuntime(1336): at dalvik.system.NativeStart.main(Native Method)
05-03 11:07:29.364: E/AndroidRuntime(1336): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class com.example.customview.ExpandableView
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.createView(LayoutInflater.java:606)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
05-03 11:07:29.364: E/AndroidRuntime(1336): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.Activity.setContentView(Activity.java:1835)
05-03 11:07:29.364: E/AndroidRuntime(1336): at com.example.customview.ExpandableActivity.onCreate(ExpandableActivity.java:23)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.Activity.performCreate(Activity.java:4465)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
05-03 11:07:29.364: E/AndroidRuntime(1336): ... 11 more
05-03 11:07:29.364: E/AndroidRuntime(1336): Caused by: java.lang.reflect.InvocationTargetException
05-03 11:07:29.364: E/AndroidRuntime(1336): at java.lang.reflect.Constructor.constructNative(Native Method)
05-03 11:07:29.364: E/AndroidRuntime(1336): at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
05-03 11:07:29.364: E/AndroidRuntime(1336): at android.view.LayoutInflater.createView(LayoutInflater.java:586)
05-03 11:07:29.364: E/AndroidRuntime(1336): ... 23 more
05-03 11:07:29.364: E/AndroidRuntime(1336): Caused by: java.lang.NullPointerException
05-03 11:07:29.364: E/AndroidRuntime(1336): at com.example.customview.ExpandableView.setChildView(ExpandableView.java:48)
05-03 11:07:29.364: E/AndroidRuntime(1336): at com.example.customview.ExpandableView.<init>(ExpandableView.java:41)
05-03 11:07:29.364: E/AndroidRuntime(1336): ... 26 more
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案例3：-