大佬教程收集整理的这篇文章主要介绍了按下后退按钮后的Android ViewPager异常,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
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FATAL EXCEPTION: main java.lang.RuntimeException: Unable to resume activity {AppName.Activities/AppName.Activities.ViewPagerActivity}: java.lang.indexoutofboundsexception: Invalid index 2,size is 0 at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2120) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135) at android.app.ActivityThread$H.handlemessage(ActivityThread.java:957) at android.os.Handler.dispatchmessage(Handler.java:99) at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:3683) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.indexoutofboundsexception: Invalid index 2,size is 0 at java.util.ArrayList.throwindexoutofboundsexception(ArrayList.java:257) at java.util.ArrayList.set(ArrayList.java:484) at android.support.v4.app.FragmentStatePagerAdapter.destroyItem(FragmentStatePagerAdapter.java:97) at android.support.v4.view.ViewPager.populate(ViewPager.java:415) at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:271) at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:244) at AppName.Activities.ViewPagerActivity.setUpView(ViewPagerActivity.java:36) at AppName.Activities.ViewPagerActivity.onStart(ViewPagerActivity.java:28) at android.app.instrumentation.callActivityOnStart(instrumentation.java:1129) at android.app.Activity.performStart(Activity.java:3791) at android.app.Activity.performRestart(Activity.java:3821) at android.app.Activity.performResume(Activity.java:3826) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2110)
以下是我的ViewPagerActivity代码,它扩展了FragmentActivity ::@H_301_8@
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public class ViewPagerActivity extends FragmentActivity { private ViewPager mViewPager; private ViewPagerAdapter adapter; Boolean flag = false; @Override protected void onCreate(Bundle arg0) { super.onCreate(arg0); setContentView(R.layout.view_pager); } @Override protected void onStart() { super.onStart(); setUpView(); } private void setUpView() { mViewPager = (ViewPager) findViewById(R.id.viewPager); adapter = new ViewPagerAdapter(getApplicationContext(),getSupportFragmentManager()); mViewPager.setAdapter(adapter); mViewPager.setCurrentItem(0); } @Override public Boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu,menu); return true; } @Override public Boolean onOptionsItemSELEcted(MenuItem item) { switch (item.getItemId()) { case R.id.setTings: startActivity(new Intent(this,AppSetTingsActivity.class)); return true; case R.id.addSituationMenu: Intent i = new Intent(this,MainLayout.class); i.putExtra("parentActivity","SplashScreenLayout"); startActivity(i); return true; case R.id.historyActivity: startActivity(new Intent(this,HistoryActivity.class)); return true; case R.id.chartActivity: startActivity(new Intent(this,ViewPagerActivity.class)); return true; default: return super.onOptionsItemSELEcted(item); } } }
行mViewPager.setCurrentItem(0);导致崩溃.@H_301_8@
这是ViewPagerAdapter代码:@H_301_8@
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public class ViewPagerAdapter extends FragmentStatePagerAdapter { private final Context context; ArrayList<ArrayList<Object>> data; int @R_80_10586@lMoodEntries = 0; static Fragment f = null; public ViewPagerAdapter(Context mcontext,FragmentManager fm) { super(fm); context = mcontext; } @Override public Fragment getItem(int position) { switch (position) { case 0: { f = new ChartFragment(context,@R_80_10586@lMoodEntries,data); break; } case 1: { f = new ViewRecordsFragment(context,data); break; } case 2: { f = new LearnMoreFragment(context); break; } } return f; } @Override public int getCount() { return 3; } }
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