当我尝试将图像加载到imageview时，我的应用程序崩溃。我试图使其正常工作，但没有工作。错误日志为
--------- beginning of crash
2018-11-14 20:33:25.029 2520-2520/com.example.suraj.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.suraj.myapplication, PID: 2520
java.lang.IllegalArgumentException: Target must not be null.
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:682)
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:665)
at com.example.suraj.myapplication.SecondFragment.onCreateView(SecondFragment.java:22)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2439)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2243)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:654)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:168)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1244)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1092)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1622)
at android.view.View.measure(View.java:19857)
at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:1676)
at android.view.View.measure(View.java:19857)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:19857)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:401)
at android.view.View.measure(View.java:19857)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19857)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19857)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:689)
at android.view.View.measure(View.java:19857)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2275)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1366)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1619)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
at android.view.Choreographer.doCallbacks(Choreographer.java:686)
at android.view.Choreographer.doFrame(Choreographer.java:621)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
我正在使用viewpager并创建了三个片段，以将图像从url加载到imageview中。 Firstfragment.java与
public class FirstFragment extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
ViewGroup rootview2=(ViewGroup)inflater.inflate(R.layout.second_frag,container,false);
ImageView ig2=(ImageView)rootview2.findViewById(R.id.imageview2);
Picasso.get().load("http://i.imgur.com/DsdfsdfR.png").into(ig2);
container.addView(rootview2);
return rootview2;
}
public static SecondFragment newInstance(String text) {
SecondFragment f = new SecondFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
我的MainActivity.java和
public class MainActivity extends AppCompatActivity {
private static final int NUM_PAGES=3;
private ViewPager mpager;
private PagerAdapter mPageradapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mpager=(ViewPager)findViewById(R.id.viewPager);
mpager.setAdapter(new ScreenSliderPagerAdapter(getSupportFragmentManager()));
}
private class ScreenSliderPagerAdapter extends FragmentStatePagerAdapter {
public ScreenSliderPagerAdapter(FragmentManager fm){
super(fm);
}
@Override
public Fragment getItem(int positon) {
switch (positon){
case 0:return FirstFragment.newInstance("FirstFragment, Instance 1");
case 1:return SecondFragment.newInstance("SecondFragment, Instance 2");
case 3:return ThirdFragment.newInstance("ThirdFragment,Instance 3");
default:return ThirdFragment.newInstance("ThirdFragment,Instance 3");
}
}
@Override
public int getCount() {
return NUM_PAGES;
}
}
}
该应用程序崩溃了，我已经上传了日志
答案 0 :(得分：-1)
**First thing you have to check whether you passing url in image is blank or not you should apply null check.and try with code like below code.**
String url=propertyModels.get(getArguments().getInt("position")).imageurl;
Picasso.with(view.getContext())
.load(url).into(imageview);