Viewpager與碎片問題

Question

我用在縱向位置這個link

其運行罰款所示的例子，但是當我打開手機橫向位置時，它強制關閉，

任何幫助，以解決這一問題可以理解， 謝謝 。

ViewPagerExample

public class ViewPagerExample extends FragmentActivity { 
private MyAdapter mAdapter; 
private ViewPager mPager; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    mAdapter = new MyAdapter(getSupportFragmentManager()); 

    mPager = (ViewPager) findViewById(R.id.pager); 
    mPager.setAdapter(mAdapter); 
} 

public static class MyAdapter extends FragmentPagerAdapter { 
    public MyAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public int getCount() { 
     return 3; 
    } 

    @Override 
    public Fragment getItem(int position) { 
     switch (position) { 
     case 0: 
      return new DetailFragment(); 
     case 1: 
      return new ImageFragment(R.drawable.ic_launcher); 
     case 2: 
      return new ImageFragment(R.drawable.five); 

     default: 
      return null; 
     } 
    } 
} 
} 

ImageFragment

public class ImageFragment extends Fragment { 
private final int imageResourceId; 

public ImageFragment(int imageResourceId) { 
    this.imageResourceId = imageResourceId; 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.e("Test", "hello"); 
} 

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

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.image_layout, container, false); 
    ImageView imageView = (ImageView) view.findViewById(R.id.imageView1); 
    imageView.setImageResource(imageResourceId); 
    return view; 
} 
} 

DetailFragment

public class DetailFragment extends Fragment { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.e("Test", "hello"); 
} 

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

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.details, container, false); 
    TextView textView = (TextView) view.findViewById(R.id.detailsText); 
    textView.setText("Testing"); 
    return view; 
} 
} 

個logcat的

java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.test.demo/com.test.demo.ViewPagerExample}: 
android.support.v4.app.Fragment$InstantiationException: Unable to instantiate 
fragment com.test.demo.ImageFragment: 
make sure class name exists, is public, and has an empty constructor that is public 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2836) 
at android.app.ActivityThread.access$1600(ActivityThread.java:117) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:130) 
at android.app.ActivityThread.main(ActivityThread.java:3687) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:507) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
at dalvik.system.NativeStart.main(Native Method) 
Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to 
instantiate fragment com.test.demo.ImageFragment: 
make sure class name exists, is public, and has an empty constructor that is public 
at android.support.v4.app.Fragment.instantiate(Fragment.java:413) 
at android.support.v4.app.FragmentState.instantiate(Fragment.java:97) 
at   
    android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1783) 
at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:213) 
at com.test.demo.ViewPagerExample.onCreate(ViewPagerExample.java:17) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 
... 12 more 
Caused by: java.lang.InstantiationException: com.test.demo.ImageFragment 
at java.lang.Class.newInstanceImpl(Native Method) 
at java.lang.Class.newInstance(Class.java:1409) 
at android.support.v4.app.Fragment.instantiate(Fragment.java:402) 
... 18 more 

Answer 1

片段必須有一個空的構造。你想傳遞給一個片段一切都與

@Override 
public Fragment getItem(int position) { 
    Fragment fragment = null; 
    Bundle args = new Bundle(); 
    switch (position) { 
    case 0: 
     fragment = new DetailFragment(); 
     break; 
    case 1: 
     args.putInt("image",R.drawable.ic_launcher); 
     fragment = new ImageFragment(); 
     fragment.setArguments(args); 
     break; 
    case 2: 
     args.putInt("image",R.drawable.five);   
     fragment = new ImageFragment(); 
     fragment.setArguments(args); 
     break; 
    } 
    return fragment; 
} 

完成，然後在片段：

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    int imageID = getArguments().getInt("image"); 
}