标签: android-viewgroup

我创建了一个自定义视图(复合视图),它继承自FrameLayout并包含多个子视图:

MediaComponentView.java:

final public class MediaComponentView extends FrameLayout {
    private int ratio = 1;

    private ImageView imageView;
    private CircularProgressView progressView;
    private View downloadButton;
    private View cancelButton;
    private View playButton;

    public MediaComponentView(Context context) {
        super(context);
        initializeViews();
    }

    public MediaComponentView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initializeViews();
    }

    public MediaComponentView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initializeViews();
    }

    private void initializeViews() {
        inflate(getContext(), R.layout.view_media_component, this);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        imageView = (ImageView) this.findViewById(R.id.image_view);
        progressView = (CircularProgressView) …

我正在尝试为checkboxPreferences编写自定义视图.我有:

<CheckBoxPreference
 android:key="@string/pref_acceptableads"
 android:summaryOff="@string/pref_acceptableads_summary_off"
 android:summaryOn="@string/pref_acceptableads_summary_on"
 android:title="@string/pref_acceptableads_title"
 android:widgetLayout="@layout/helpfulcheckbox_layout" />

和:

<?xml version="1.0" encoding="UTF-8"?>
<ViewGroup xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+android:id/widget_frame"
  android:layout_width="wrap_content"
  android:layout_height="match_parent">
  <ImageView
    android:id="@+id/image"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:src="@drawable/image" />
  <CheckBox
    android:id="@+id/checkbox"
    android:layout_width="0dp"
    android:layout_height="wrap_content" />
</ViewGroup>

问题在于我的viewgroup.我收到一个例外:

03-11 13:49:11.520:E/AndroidRuntime(12286):FATAL EXCEPTION:main 03-11 13:49:11.520:E/AndroidRuntime(12286):进程:org.adblockplus.android,PID:12286 03-11 13:49:11.520:E/AndroidRuntime(12286):android.view.InflateException:二进制XML文件行#2:错误膨胀类android.view.ViewGroup 03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view.LayoutInflater.createView(LayoutInflater.java:620)03-11 13:49:11.520:E/AndroidRuntime(12286):at android.view.LayoutInflater.onCreateView(LayoutInflater.java:652)03-11 13 :49:11.520:E/AndroidRuntime(12286):at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)03-11 13:49:11.520:E/AndroidRuntime(12286):at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)03-11 13:49:11.520:E/AndroidRuntime(12286):at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)03-11 13: 49:11.520:E/AndroidRuntime(12286):在android.view.LayoutInflater.inflate(LayoutInfla)ter.java:469)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view.LayoutInflater.inflate(LayoutInflater.java:397)03-11 13:49:11.520:E/AndroidRuntime( 12286):在android.view.LayoutInflater.inflate(LayoutInflater.java:353)03-11 13:49:11.520:E/AndroidRuntime(12286):at android.preference.Preference.onCreateView(Preference.java:489)03 -11 13:49:11.520:E/AndroidRuntime(12286):在android.preference.Preference.getView(Preference.java:460)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.preference .PreferenceGroupAdapter.getView(PreferenceGroupAdapter.java:221)03-11 13:49:11.520:E/AndroidRuntime(12286):at android.widget.AbsListView.obtainView(AbsListView.java:2255)03-11 13:49:11.520 :E/AndroidRuntime(12286):在android.widget.ListView.makeAndAddView(ListView.java:1790)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.ListView.fillDown(ListView. java:691)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.ListView.fillFromTop(ListView.java:752)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.ListView.layoutChildren(ListView.java:1616)03-11 13:49:11.520:E/AndroidRuntime(12286):在android. widget.AbsListView.onLayout(AbsListView.java:2087)03-11 13:49:11.520:E/AndroidRuntime(12286):at android.view.View.layout(View.java:14841)03-11 13:49: 11.520:E/AndroidRuntime(12286):在android.view.ViewGroup.layout(ViewGroup.java:4631)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.LinearLayout.setChildFrame(LinearLayout) .java:1671)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)03-11 13:49:11.520:E/AndroidRuntime(12286) ):在android.widget.LinearLayout.onLayout(LinearLayout.java:1434)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view.View.layout(View.java:14841)03- 11 …

我想创建一个带有2个TextView的自定义视图,可以从xml更改文本和文本外观.这个视图应该有两个状态 - normal和selected(TextViews样式应该对每个状态都不同).

我需要一些例子.

我想在现有布局的底部添加一个视图，而不管 Activity 布局文件中定义的 ViewGroup 的类型（线性、相对等...）

活动布局文件如下所示：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Get Ad"
    android:layout_centerInParent="true"
    android:onClick="showAdd"/>
 </RelativeLayout>

这是放置视图的代码：

ViewGroup rootView = (ViewGroup)((Activity) m_context).findViewById(android.R.id.content);
RelativeLayout.LayoutParams lay = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.MATCH_PARENT,
            RelativeLayout.LayoutParams.MATCH_PARENT);
    lay.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
    rootView.addView(adView,lay);

问题是 View 出现在屏幕中间而不是底部，正如预期的那样

我正在使用 InputMethodService、Keyboard 和 KeyboardView（我知道，它最近已被弃用）来创建自定义键盘。

  override fun onCreateInputView(): View {
    view = layoutInflater.inflate(
        R.layout.keyboard_view_test,
        null
    )
    keyboardView =
        view.findViewById<KeyboardView>(R.id.keyboard)
    keyboard = Keyboard(this, R.xml.keyboard_layout)
    keyboardView.keyboard = keyboard
    keyboardView.isPreviewEnabled = false
    keyboardView.setOnKeyboardActionListener(this)
    return keyboardView

}

当使用 Keyboard_view_test.xml 中的 KeyboardView 作为根元素时，键盘工作得非常好。当我开始将它包装在 LinearLayout 或任何其他 ViewGroup 中而不更改任何其他内容时（请参阅keyboard_view_test.xml），我得到一个 IllegalStateException。我不明白，堆栈跟踪没有引用我的任何代码。我怎样才能让它发挥作用？

键盘视图测试.xml：

<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:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorGboardBackground">

<android.inputmethodservice.KeyboardView
    android:id="@+id/keyboard"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:background="@color/colorGboardBackground"
    android:keyBackground="@drawable/key_background"
    android:keyPreviewLayout="@layout/key_preview"
    android:keyPreviewOffset="10dp"
    android:keyTextColor="@color/colorGboardKeyText"
    android:keyTextSize="22sp"
    android:labelTextSize="22sp"
    android:shadowRadius="0" />

该错误似乎发生在 onCreateInputView() 返回后

错误堆栈：

 java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on …

我想显示一种颜色供用户预览。View我应该使用哪个？

我想要一个小方块，比如说，100dp。