我知道这个问题需要很多次,但经过多次研究后我都没有得到答复.
在我的主要活动中,我有一个视图寻呼机,我为它设置了一个适配器：
在我的主要活动中,我有一个视图寻呼机,我为它设置了一个适配器：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager mPager;
PagerAdapter mPagerAdapter;
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
@Override
public void onActivityResult(int requestCode,int resultCode,Intent data) {
String tag = "onActivityResult";
String msg = "omad";
String timeStamp;
Bitmap reducedImage;
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();//content://media/external/images/media/40596
selectedImagePath = getPath(selectedImageUri);// /storage/emulated/0/DCIM/Camera/IMG_20131022_192859.jpg
//reducedImage = reduceImageSize(selectedImagePath);
Bitmap img = BitmapFactory.decodeFile(selectedImagePath);
File Images = new File(MainActivity.root + File.separator + "Images");
String[] Image = Images.list();
int ImageCount = Image.length;
try {
FileOutputStream fos = new FileOutputStream(new File(root + File.separator +
"/Images" + File.separator + String.valueOf(ImageCount) + ".jpg"));
img.compress(Bitmap.CompressFormat.JPEG,90,fos);
fos.flush();
fos.close();
} catch (IOException e) {
Log.e("onActivityResult",e.getMessage());
}
}
}
NUM_PAGES += 1;
ScreenSlidePagerAdapter test = new ScreenSlidePagerAdapter(getSupportFragmentManager());
test.notifyDataSetChanged();
}
我的主要活动中有适配器类,如私有类：
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
@Override
public Fragment getItem(int position) {
Log.v("adapter","getitem" + String.valueOf(position));
return ScreenSlidePageFragment.create(position);
}
@Override
public int getCount() {
Log.v("adapter","getcount" + String.valueOf(NUM_PAGES));
return num_pages;
}
最后我有一个片段类,它为视图中的每个页面扩展我的布局pager.it有图像视图和文本和…：
public class ScreenSlidePageFragment extends Fragment {
public static final String ARG_PAGE = "page";
private int mPageNumber;
private Context mContext;
private int Cimage;
private ArrayList<Uri> imageUri;
public static ScreenSlidePageFragment create(int pageNumber){
ScreenSlidePageFragment fragment = new ScreenSlidePageFragment();
Bundle args = new Bundle();
args.putInt(ARG_PAGE,pageNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPageNumber = getArguments().getInt(ARG_PAGE);
imageUri = new ArrayList<Uri>();
...
// image uri get uri of image that saved in directory of app
}
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout containing a title and body text.
//mContext = getActivity();
ViewGroup rootView = (ViewGroup) inflater
.inflate(R.layout.fragment_screen_slide_page,container,false);
// Set the title view to show the page number.
//View v;
ImageView imageView;
//if(convertView == null){
/*LayoutInflater li = LayoutInflater.from(mContext) ;
v = li.inflate(R.layout.imagetext,null);*/
rootView.setId(mPageNumber);
Button button = (Button) rootView.findViewById(R.id.ImageSetting);
button.setId(mPageNumber);
String title = MainActivity.imageSetting.getString(String.valueOf(mPageNumber),"default");
TextView tv = (TextView) rootView.findViewById(R.id.ImageText);
tv.setText(title);
imageView = (ImageView) rootView.findViewById(R.id.image); //imageView = new ImageView(mContext);
SetLayoutSize(mPageNumber);
imageView.setLayoutParams(new RelativeLayout.LayoutParams(layoutWidth,layoutHeight));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setPadding(30,50,70,30);
//imageView.setImageResource(mThumbIds[position]);
//imageView.setImageURI(imageUri.get(position));
BitmapFactory.Options option = new BitmapFactory.Options();
option.inSampleSize = 4;
Bitmap bmp = BitmapFactory.decodeFile(imageUri.get(mPageNumber).getPath(),option);
imageView.setImageBitmap(bmp);
/*((TextView) rootView.findViewById(android.R.id.text1)).setText(
getString(R.string.title_template_step,mPageNumber + 1));*/
return rootView;
}
// this method is not very important
private void SetLayoutSize(int position){
BitmapFactory.Options option = new BitmapFactory.Options();
option.inJustDecodeBounds = true;
BitmapFactory.decodeFile(imageUri.get(position).getPath(),option);
float scale = (float) ((float) ((double)option.outHeight) / ((double)option.outWidth));
//Log.v("reduceimage",String.valueOf(imagetemp.getWidth()) + " * " + String.valueOf(imagetemp.getHeight()));
//Log.v("scale",String.valueOf(scale));
layoutWidth = MainActivity.display.getWidth();
layoutHeight = MainActivity.display.getHeight();
layoutHeight = (int) ( layoutWidth * scale);
//Log.v("size",String.valueOf(width) + " * " + String.valueOf(height));
//Bitmap imagebmp = BitmapFactory.decodeFile(path);
}
这是每个片段具有的布局：
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content"
>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ImageView>
<TextView
android:id="@+id/ImageText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal" />
<Button
android:id="@+id/ImageSetting"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:onClick="SettingButton"
android:background="@drawable/ic_menu_moreoverflow_normal_holo_light" />
</RelativeLayout>
</ScrollView>
在我的主要活动中,我有一个按钮,从图库中获取图像并保存在目录中.我应该在onActivityResult中更新我的适配器,但是我收到此错误：
02-03 19：30：21.567：E / AndroidRuntime(3407)：java.lang.IllegalStateException：应用程序的PagerAdapter在不调用PagerAdapter#notifyDataSetChanged的情况下更改了适配器的内容！预期的适配器项目数：1,找到：2 Pager id：com.sober.secret：id / pager Pager class：class android.support.v4.view.ViewPager有问题的适配器：class com.example.test.MainActivity $ScreenSlidePagerAdapter
但在应用程序崩溃后,我的图像显示正确.
我尝试notifyDataSetChanged()但没有成功,我尝试在stackoverflow中的任何解决方案.
解决方法
在NUM_PAGES = 1之后调用mPagerAdapter.notifyDataSetChanged();
