我正在尝试将viewpager放在我的项目中的一个片段中。最初我使用asynctask为diff项目上的图像加载json解析。
当我尝试将json项目与我的片段项目组合时，我删除了asyctask，因为我不知道如何一起实现它们。
下面是我的代码和错误日志，问题这里是网络IO试图访问主UI线程，但没有asynctask我不知道如何解决它
非常感谢任何帮助。
MainActivity
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
FragmentTabHost tabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
tabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
//1
tabHost.addTab(tabHost.newTabSpec("Highlight").setIndicator("Highlight"),
AppleFragment.class, null);
...
//4
tabHost.addTab(tabHost.newTabSpec("Gallery").setIndicator("Gallery"),
GalleryFragment.class, null);
GalleryFragment
public class GalleryFragment extends Fragment{
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_pager, container,false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mPager = (ViewPager) view.findViewById(R.id.pager);
mPagerAdapter = new CustomPagerAdapter(getChildFragmentManager());
mPager.setAdapter(mPagerAdapter);
mPager.setCurrentItem(0);
}
ViewPagerPageFragment
public class ViewPagerPageFragment extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_page,container,false);
}
// url to make request
private static String url = "http://vina.harvestcamasu.com/vina/xml/image.json";
// JSON Node names
static String TAG_IMAGE = "Image";
static String TAG_PICURL = "PicURL";
private String[] images = new String[13];
ProgressDialog mProgressDialog;
public Drawable d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13;
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
view.findViewById(R.id.imageView1);
try {
// Do something...
Thread.sleep(5000);
JSONParser jParser = new JSONParser();
jParser.getJSONFromUrl(url);
// get Gallery JSONObject
JSONObject json = jParser.getJSONFromUrl(url);
// get Artist JSONObject
JSONObject json_gallery=json.getJSONObject("Gallery");
// get Image JSONArray
JSONObject json_artist=json_gallery.getJSONObject("Artist");
//getting array from image
JSONArray Image = null;
try {
Image = json_artist.getJSONArray(TAG_IMAGE);
for (int i = 0; i < Image.length(); i++) {
JSONObject m = Image.getJSONObject(i);
images[i] = m.getString("PicURL");
}
InputStream is1 = (InputStream) new URL(images[0]).getContent();
d1 = Drawable.createFromStream(is1, "src name");
.
.
.
InputStream is13= (InputStream) new URL(images[12]).getContent();
d13= Drawable.createFromStream(is13, "src name");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ;
}
}
CustomPagerAdapter
public class CustomPagerAdapter extends FragmentStatePagerAdapter {
public CustomPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return new ViewPagerPageFragment();
}
private Drawable d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13;
public void MyPagerAdapter( Drawable draw1, Drawable draw2,Drawable draw3,Drawable draw4,Drawable draw5,
Drawable draw6,Drawable draw7,Drawable draw8,Drawable draw9,Drawable draw10,Drawable draw11,
Drawable draw12,Drawable draw13){
d1 = draw1;
.
.
d13= draw13;
}
public int getCount() {
return 13;
}
public Object instantiateItem(View collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = R.layout.first_page;
View view = inflater.inflate(resId, null);
ImageView image1 = (ImageView)view.findViewById(R.id.imageView1);
switch (position) {
case 0:
image1.setImageDrawable(d1);
break;
.
.
case 12:
image1.setImageDrawable(d13);
break;
}
((ViewPager) collection).addView(view, 0);
return view;
}
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
public Parcelable saveState() {
return null;
}
}
错误记录
12-12 14:25:08.929: E/AndroidRuntime(9185): FATAL EXCEPTION: main
12-12 14:25:08.929: E/AndroidRuntime(9185): android.os.NetworkOnMainThreadException
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
12-12 14:25:08.929: E/AndroidRuntime(9185): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
12-12 14:25:08.929: E/AndroidRuntime(9185): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
12-12 14:25:08.929: E/AndroidRuntime(9185): at java.net.InetAddress.getAllByName(InetAddress.java:220)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
12-12 14:25:08.929: E/AndroidRuntime(9185): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
12-12 14:25:08.929: E/AndroidRuntime(9185): at com.tonycube.fragmenttabdemo.JSONParser.getJSONFromUrl(JSONParser.java:39)
12-12 14:25:08.929: E/AndroidRuntime(9185): at com.tonycube.fragmenttabdemo.ViewPagerPageFragment.onViewCreated(ViewPagerPageFragment.java:56)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:925)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.view.ViewPager.populate(ViewPager.java:1064)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1375)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-12 14:25:08.929: E/AndroidRuntime(9185): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2257)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.View.measure(View.java:12892)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1240)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2628)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.os.Looper.loop(Looper.java:137)
12-12 14:25:08.929: E/AndroidRuntime(9185): at android.app.ActivityThread.main(ActivityThread.java:4512)
12-12 14:25:08.929: E/AndroidRuntime(9185): at java.lang.reflect.Method.invokeNative(Native Method)
12-12 14:25:08.929: E/AndroidRuntime(9185): at java.lang.reflect.M
答案 0 :(得分：0)
你应该在线程或异步
中使用下面的代码try {
// Do something...
Thread.sleep(5000);
JSONParser jParser = new JSONParser();
jParser.getJSONFromUrl(url);
// get Gallery JSONObject
JSONObject json = jParser.getJSONFromUrl(url);
// get Artist JSONObject
JSONObject json_gallery=json.getJSONObject("Gallery");
// get Image JSONArray
JSONObject json_artist=json_gallery.getJSONObject("Artist");
//getting array from image
JSONArray Image = null;
try {
Image = json_artist.getJSONArray(TAG_IMAGE);
for (int i = 0; i < Image.length(); i++) {
JSONObject m = Image.getJSONObject(i);
images[i] = m.getString("PicURL");
}
InputStream is1 = (InputStream) new URL(images[0]).getContent();
d1 = Drawable.createFromStream(is1, "src name");
.
.
.
InputStream is13= (InputStream) new URL(images[12]).getContent();
d13= Drawable.createFromStream(is13, "src name");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ;
}