CustomView中的抽象类android错误即时

Question

我正在使用以下代码执行抽象类的自定义视图：

public abstract class ReplyView extends View {

    protected RelativeLayout baseLayout;

    public ReplyView(Context context) {
        super(context);
        init(context);
    }

    public ReplyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public ReplyView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    public void init(Context context) {
        setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        baseLayout = new RelativeLayout(context);
        baseLayout.setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        initializeComponents();
    }


    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        onImplementationDraw();
        baseLayout.draw(canvas);
    }

    public abstract void initializeComponents();

    public abstract void onImplementationDraw();

    public abstract String getResult();
}

这是一个实现：

public class YesNoReplyView extends ReplyView {

    private ToggleButton toggleButton;

    public YesNoReplyView(Context context) {
        super(context);
    }

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

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

    @Override
    public void initializeComponents() {
        toggleButton = new ToggleButton(getContext());
        toggleButton.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
        toggleButton.setTextOn("Si");
        toggleButton.setTextOn("No");
//        toggleButton.setBackground(getContext().getResources().getDrawable(R.drawable.selector_toggle));
    }

    @Override
    public void onImplementationDraw() {

    }

    @Override
    public String getResult() {
        String result = toggleButton.isChecked() ? "Si" : "No";
        return result;
    }
}

我的片段中有这个：

public class ReplyFragment extends Fragment {

    @InjectView(R.id.replyView)
    ReplyView replyView;
    private int replie;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        replie = getArguments().getInt("reply");
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        initReplyView();
        View view = inflater.inflate(R.layout.work_reply_fragment, container, false);
        ButterKnife.inject(this, view);
        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    private void initReplyView() {
        switch (replie) {
            case 1:
                replyView = new TextReplyView(getActivity());
                break;
            case 2:
                replyView = new IntNumberReplyView(getActivity());
                break;
            case 3:
                //Fecha replyView = new
                break;
            case 4:
                replyView = new YesNoReplyView(getActivity());
                break;
            case 5:
                replyView = new GoodBadReplyView(getActivity());
                break;
            case 6:
                //Decimal
                break;
            case 7:
                //mes año
                break;
            case 8:
                replyView = new YearReplyView(getActivity());
                break;
            case 9:
                replyView = new TextReplyView(getActivity());
                break;
            default:
                replyView = null;
                break;
        }
    }
}

在我的XML中，我有一个使用此自定义视图的视图。

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:fontawesometext="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginBottom="16dp"
        android:layout_marginRight="16dp">

        <com.beardedhen.androidbootstrap.FontAwesomeText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="4dp"
            android:textSize="45sp"
            android:textColor="#737373"
            android:id="@+id/faIcon"
            fontawesometext:fa_icon="fa-question" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Este es un eaa asd jemplo de pregunta blablabla"
            android:id="@+id/tvQuestion"
            android:textColor="@color/primary"
            android:textStyle="bold"
            android:textSize="28sp"
            android:typeface="monospace"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="32dp"
            android:layout_marginBottom="16sp" />
    </LinearLayout>

    <view
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/replyView"
        class="com.firext.android.activities.work.reply.ui.ReplyView" />


</LinearLayout>

我得到了这个错误：

08-21 21:15:08.915  14180-14180/com.firext.android E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.firext.android, PID: 14180
    android.view.InflateException: Binary XML file line #44: Error inflating class com.firext.android.activities.work.reply.ui.ReplyView
            at android.view.LayoutInflater.createView(LayoutInflater.java:629)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:739)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:802)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:500)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:410)
            at com.firext.android.activities.work.reply.ReplyFragment.onCreateView(ReplyFragment.java:46)
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
            at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:478)
            at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
            at android.view.View.measure(View.java:16987)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5257)
            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:16987)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5257)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at android.view.View.measure(View.java:16987)
            at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:704)
            at android.view.View.measure(View.java:16987)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5257)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at android.view.View.measure(View.java:16987)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5257)
            at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:447)
            at android.view.View.measure(View.java:16987)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5257)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2429)
            at android.view.View.measure(View.java:16987)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1986)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1157)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1368)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1044)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5749)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
            at android.view.Choreographer.doCallbacks(Choreographer.java:580)
            at android.view.Choreographer.doFrame(Choreographer.java:550)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
            at android.os.Handler.handleCallback(Handler.java:738)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5070)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:631)
     Caused by: java.lang.InstantiationException: Can't instantiate abstract class com.firext.android.activities.work.reply.ui.ReplyView
            at ja

怎么了？

Answer 1

您无法实例化抽象类。抽象类是指子类。如果您想要合同化这些方法，那么制作辅助界面可能会有所帮助，但这实际上取决于您的预期设计。

http://docs.oracle.com/javase/tutorial/java/IandI/abstract.html

Answer 2

<view
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/replyView"
    class="com.firext.android.activities.work.reply.ui.ReplyView" />

这是您尝试实例化抽象类的地方。您无法在此处使用ReplyView。相反，你应该做像

这样的事情

<com.firext.android.activities.work.reply.ui.YesNoReplyView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/replyView" />

请注意，您可以将自定义视图的名称直接用作标记。

修改

仔细查看代码之后，您似乎需要一些比这更动态的东西。目前，我没有给你任何好的建议。也许你应该开始一个关于你的设计的新问题。请务必提供有关您的具体要求的详细信息。

此外，您可以使用XML布局而不是覆盖initializeComponents()来简化自定义视图类。