每当按下壁纸按钮时，我的应用程序都会崩溃。这是我的代码。请帮忙。我给了必要的壁纸许可。我不知道如何正确使用壁纸管理器但有一些方法我可以完成这个
public class ScreenSlideActivity extends FragmentActivity {
private static final int NUM_PAGES = 5;
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen_slide);
// Instantiate a ViewPager and a PagerAdapter.
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPager.setAdapter(mPagerAdapter);
mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
invalidateOptionsMenu();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.activity_screen_slide, menu);
menu.findItem(R.id.action_previous).setEnabled(mPager.getCurrentItem() > 0);
MenuItem item = menu.add(Menu.NONE, R.id.action_next, Menu.NONE,
(mPager.getCurrentItem() == mPagerAdapter.getCount() - 1)
? R.string.action_finish
: R.string.action_next);
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpTo(this, new Intent(this, MainActivity.class));
return true;
case R.id.action_previous:
mPager.setCurrentItem(mPager.getCurrentItem() - 1);
return true;
case R.id.action_next:
mPager.setCurrentItem(mPager.getCurrentItem() + 1);
return true;
case R.id.setasbg:
WallpaperManager mwp = WallpaperManager.getInstance(getApplicationContext());
try {
mwp.setResource(mPager.getCurrentItem());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
return super.onOptionsItemSelected(item);
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return ScreenSlidePageFragment.create(position);
}
@Override
public int getCount() {
return NUM_PAGES;
}
}
}
这是我的另一个班级
public class ScreenSlidePageFragment extends Fragment {
public static final String ARG_PAGE = "page";
private int mPageNumber;
public static ScreenSlidePageFragment create(int pageNumber) {
ScreenSlidePageFragment fragment = new ScreenSlidePageFragment();
Bundle args = new Bundle();
args.putInt(ARG_PAGE, pageNumber);
fragment.setArguments(args);
return fragment;
}
public ScreenSlidePageFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPageNumber = getArguments().getInt(ARG_PAGE);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout containing a title and body text.
ViewGroup rootView = (ViewGroup) inflater
.inflate(R.layout.fragment_screen_slide_page, container, false);
switch(mPageNumber){
case 1:
((TextView) rootView.findViewById(R.id.text1)).setBackgroundResource(R.drawable.nfs);
break;
case 2:
((TextView) rootView.findViewById(R.id.text1)).setBackgroundResource(R.drawable.nfs2);
break;
case 3:
((TextView) rootView.findViewById(R.id.text1)).setBackgroundResource(R.drawable.nfs3);
break;
case 4:
((TextView) rootView.findViewById(R.id.text1)).setBackgroundResource(R.drawable.nfs4);
break;
}
return rootView;
}
public int getPageNumber() {
return mPageNumber;
}
}
Log Cat：
01-03 11:36:16.389: I/PGA(6939): New SOCKET connection: com.chirag.nfs1 (pid 6939, tid 6939)
01-03 11:36:22.219: D/dalvikvm(6939): GC_FOR_ALLOC freed 114K, 27% free 6573K/8899K, paused 0ms
01-03 11:36:22.249: I/dalvikvm-heap(6939): Grow heap (frag case) to 16.475MB for 8294412-byte allocation
01-03 11:36:22.269: D/dalvikvm(6939): GC_CONCURRENT freed 5K, 14% free 14668K/17027K, paused 0ms+0ms
01-03 11:36:22.289: D/dalvikvm(6939): GC_FOR_ALLOC freed 0K, 14% free 14668K/17027K, paused 0ms
01-03 11:36:22.289: I/dalvikvm-heap(6939): Grow heap (frag case) to 19.986MB for 3686412-byte allocation
01-03 11:36:22.309: D/dalvikvm(6939): GC_CONCURRENT freed 0K, 12% free 18268K/20675K, paused 0ms+0ms
01-03 11:36:25.709: D/dalvikvm(6939): GC_FOR_ALLOC freed 8112K, 51% free 10212K/20675K, paused 0ms
01-03 11:36:25.709: I/dalvikvm-heap(6939): Grow heap (frag case) to 20.029MB for 8294412-byte allocation
01-03 11:36:25.729: D/dalvikvm(6939): GC_CONCURRENT freed 2K, 12% free 18310K/20675K, paused 0ms+0ms
01-03 11:36:25.749: D/dalvikvm(6939): GC_FOR_ALLOC freed 0K, 12% free 18311K/20675K, paused 0ms
01-03 11:36:25.749: I/dalvikvm-heap(6939): Grow heap (frag case) to 23.543MB for 3686412-byte allocation
01-03 11:36:25.769: D/dalvikvm(6939): GC_CONCURRENT freed 0K, 10% free 21911K/24323K, paused 0ms+0ms
01-03 11:36:27.679: W/ResourceType(6939): No package identifier when getting name for resource number 0x00000001
01-03 11:36:27.679: D/AndroidRuntime(6939): Shutting down VM
01-03 11:36:27.679: W/dalvikvm(6939): threadid=1: thread exiting with uncaught exception (group=0xb2c5e180)
01-03 11:36:27.679: D/AndroidRuntime(6939): procName from cmdline: com.chirag.nfs1
01-03 11:36:27.679: E/AndroidRuntime(6939): in writeCrashedAppName, pkgName :com.chirag.nfs1
01-03 11:36:27.689: I/Process(6939): Sending signal. PID: 6939 SIG: 9
01-03 11:36:27.689: D/AndroidRuntime(6939): file written successfully with content: com.chirag.nfs1 StringBuffer : ;com.chirag.nfs1