这是我试图仔细遵循的指示:
http://examples.javacodegeeks.com/android/core/app/fragment/android-fragments-example/
这是Logcat中出现的第一个错误:
E / MoreInfoHPW_ViewGroup(21404):父视图不是TextView
E / AndroidRuntime(21404):致命异常:主
E / AndroidRuntime(21404):进程:com.example.fragmentstest,PID:21404
E / AndroidRuntime(21404):java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.fragmentstest / com.example.fragmentstest.MainActivity}:android.view.InflateException:二进制XML文件行#20:膨胀类片段错误
这是我的MainActivity和activity_main代码:
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void selectFrag(View view){
Fragment fr;
if (view == findViewById(R.id.button2)){
fr = new FragmentTwo();
} else {
fr = new FragmentOne();
}
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.replace(R.id.fragment_place, fr);
fragmentTransaction.commit();
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Fragment No.1"
android:onClick="selectFrag" />
<Button
android:id="@+id/button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Fragment No.2"
android:onClick="selectFrag"/>
<fragment
android:name="com.example.fragmentstest.FragmentOne"
android:id="@+id/fragment_place"
android:layout_width="match_parent"
android:layout_height="match_parent"/>"
</LinearLayout>
答案 0 :(得分:0)
我终于找到了错误原因。这是一个逻辑错误(很难找到)。 在FragmentOne.java和FragmentTwo.java中,我返回activity_main.xml而不是fragment_one.xml和fragment_two.xml作为源布局。 对不起,如果问题不在我在问题正文中提供的信息中。但至少现在我知道了更多!
以下是示例代码:
public class FragmentTwo extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
//I had to use fragment_one instead of activity_main.
//Such simple mistake took about two days of my time.
return inflater.inflate(
R.layout.activity_main, container, false);
}