Question

我有两个片段类，我在google developer doc之后添加了正确的片段事务。每当我在第一个片段布局中添加按钮时，我的应用程序崩溃。片段页面无法在应用程序中打开。所以我尝试没有按钮，一切正常。

代码如下：第一个片段布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#a6c"
android:padding="16dp"
android:layout_weight="1">

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_margin="20dp"
    android:layout_weight="0.7">

    <TextView
        android:text="Word"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#000000"
        android:background="#ffffff"
        android:textSize="40dp"
        android:layout_marginBottom="20dp"
        android:gravity="center"/>

    <!--main word load-->
    <TextView android:id="@+id/word"
        style="?android:textAppearanceLarge"
        android:textStyle="bold"
        android:textColor="#fff"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Hello World" />


    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >



       <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:id="@+id/next"
            android:layout_gravity="center"
            android:text="Next"
            android:textSize="?android:textAppearanceLarge"
            />


    </LinearLayout>
    </LinearLayout> </LinearLayout>

这是片段类

    public static class PlaceholderFragment extends Fragment implements View.OnClickListener {

    public PlaceholderFragment() {
    }


    View v;
    TextView tv1;
    Button checkAnswer,next,prev;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        v = inflater.inflate(R.layout.fragment_card_front, container, false);

        Log.v("Case","Working inside the first");
        tv1 = (TextView) v.findViewById(R.id.word);
        tv1.setText(CardFrontFragment.word[wordC]);
        tv1.setOnClickListener(this);
        next = (Button)v.findViewById(R.id.next);
        next.setOnClickListener(this);

        return v;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.next:
                //LOad NExt wOrD
                Log.v("Case","insideCase");
                Fragment fragment = new CardBackFragment();
                FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

                fragmentTransaction.replace(R.id.container, fragment);
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.commit();
        }
    }}

和logCat

10-09 15:00:36.320    1850-1850/com.zerothtech.greapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.zerothtech.greapp, PID: 1850
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zerothtech.greapp/com.zerothtech.greapp.CardFrontFragment}: android.view.InflateException: Binary XML file line #43: Error inflating class <unknown>
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
        at android.app.ActivityThread.access$800(ActivityThread.java:144)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        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:899)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
 at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
        at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:548)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1220)
        at android.app.Activity.performStart(Activity.java:5949)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261)

        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)

完整的错误日志位于＆gt; http://pastebin.com/fRjhcqHw

我正在使用适当的代码在框架布局中添加它们。我添加片段没有问题。当我在布局中添加一些按钮（一个按钮与三个按钮相同）时，片段的功能停止工作。

提前致谢。

Answer 1

logcat的：

Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x1
        at android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:572)
        at android.widget.TextView.<init>(TextView.java:999)
        at android.widget.Button.<init>(Button.java:111)

布局：

android:textSize="?android:textAppearanceLarge"

android:textAppearanceLarge无法解析为维度。

在布局中使用android:textApperance属性，或使用textSize维度值。

Answer 2

xml中没有Button，标识为prev。对于它，findViewById返回null，并尝试通过它访问setOnClickListener导致您的应用程序崩溃。

Answer 3

让你的Fragment类非静态。我认为这将解决你的问题。

在片段中添加按钮时Android崩溃

3 个答案: