I am using ViewPager and Tabpageradapter for swiping one activity to another but I am getting class not found exception below android 4.0 version.
MainActivity****:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initilization Viewpager in main activity
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
context = this.getApplicationContext();
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setBackgroundDrawable(getResources().getDrawable(R.drawable.blackbox));
actionBar.setStackedBackgroundDrawable(getResources().getDrawable(
R.drawable.blackbox));
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
TabsPagerAdapter.class :
//Class using for tabs
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int index) {
switch (index) {
case 0:
// Top Rated fragment activity that is the first activity to open
return new PunjabiFragment();
case 1:
// Games fragment activity(Second activity to open
return new HindiFragment();
case 2:
// Movies fragment activity(third activity to open
return new EnglishFragment();
}
return null;
}
@Override
public int getCount() {
// get item count - equal to number of tabs
return 3;
}
AndroidManifest.xml
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="23" />
Getting this error in logcat :
Failed resolving Lcom/Neha/awesomestatus/MainActivity; interface 16 'Landroid/app/ActionBar$TabListener;'
W/dalvikvm(837): Link of class 'Lcom/Neha/awesomestatus/MainActivity;' failed
D/AndroidRuntime(837): Shutting down VM
W/dalvikvm(837): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
E/AndroidRuntime(837): FATAL EXCEPTION: main
E/AndroidRuntime(837): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.Neha.awesomestatus/com.Neha.awesomestatus.MainActivity}: java.lang.ClassNotFoundException: com.Neha.awesomestatus.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.Neha.awesomestatus-1.apk]
E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: com.Neha.awesomestatus.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.Neha.awesomestatus-1.apk]
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
您是否在XML文件中使用<android.support.v4.view.ViewPager />
而不是<ViewPager />
?
Besides Sohaib's answer, pointing that you should use the compatibility library, if you are loading content from a web service, you may need to extend from FragmentStatePagerAdapter
. I had some similar problem before and just changing the base PagerAdapter fixed the issue.
Carefully look at your onCreate
method.
In my case I was checking for some permissions and using return;
if the permission is not granted.
That is why I could not run my app on the marshmallow, but could run my app on the lower versions.
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