我试图从我的selectFragment中的viewPager获取图像的索引/位置,我在我的一个活动中动态添加,然后使用我在我的活动中创建的界面将其传递给我的活动我的SelectFragment类。我打电话时,我可以举杯祝酒......
new SelectFragment().chosenGuitarType(pos);
但是,这一行会引发错误......
mCallback.onGuitarSelected(position);
这是我的logcat ......
07-07 00:49:05.835 3403-3403/com.example.text.guitar E/InputEventReceiver﹕ Exception dispatching input event.
07-07 00:49:05.835 3403-3403/com.example.text.guitar E/MessageQueue-JNI﹕ Exception in MessageQueue callback: handleReceiveCallback
07-07 00:49:05.855 3403-3403/com.example.text.guitar E/MessageQueue-JNI﹕ java.lang.NullPointerException
at com.example.text.guitar.SelectFragment.chosenGuitarType(SelectFragment.java:98)
at com.example.text.guitar.SelectFragment.access$000(SelectFragment.java:24)
at com.example.text.guitar.SelectFragment$TouchImageAdapter$1.onClick(SelectFragment.java:119)
at android.view.View.performClick(View.java:4747)
at com.example.text.guitar.TouchImageView$1.onTouch(TouchImageView.java:91)
at android.view.View.dispatchTouchEvent(View.java:8186)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2332)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1616)
at android.app.Activity.dispatchTouchEvent(Activity.java:2665)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2280)
at android.view.View.dispatchPointerEvent(View.java:8386)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4795)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4646)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4200)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4254)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4223)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4334)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4231)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4391)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4200)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4254)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4223)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4231)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4200)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6610)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6489)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6460)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6425)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6690)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:138)
at android.os.Looper.loop(Looper.java:131)
at android.app.ActivityThread.main(ActivityThread.java:5752)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.intern
07-07 00:49:05.855 3403-3403/com.example.text.guitar D/AndroidRuntime﹕ Shutting down VM
07-07 00:49:05.855 3403-3403/com.example.text.guitar W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x4175fda0)
07-07 00:49:05.855 3403-3403/com.example.text.guitar E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.text.guitar, PID: 3403
java.lang.NullPointerException
at com.example.text.guitar.SelectFragment.chosenGuitarType(SelectFragment.java:98)
at com.example.text.guitar.SelectFragment.access$000(SelectFragment.java:24)
at com.example.text.guitar.SelectFragment$TouchImageAdapter$1.onClick(SelectFragment.java:119)
at android.view.View.performClick(View.java:4747)
at com.example.text.guitar.TouchImageView$1.onTouch(TouchImageView.java:91)
at android.view.View.dispatchTouchEvent(View.java:8186)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2477)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2209)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2332)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1616)
at android.app.Activity.dispatchTouchEvent(Activity.java:2665)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2280)
at android.view.View.dispatchPointerEvent(View.java:8386)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4795)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4646)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4200)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4254)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4223)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4334)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4231)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4391)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4200)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4254)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4223)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4231)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4200)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6610)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6489)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6460)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6425)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6690)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:138)
这是我的片段代码:
package com.example.text.guitar;
import android.app.Activity;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;
public class SelectFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
private ExtendedViewPager mViewPager;
static Activity thisActivity = null;
private onGuitarSelectedListener mCallback;
public static SelectFragment newInstance() {
SelectFragment fragment = new SelectFragment();
return fragment;
}
public SelectFragment() {
}
public interface onGuitarSelectedListener {
public void onGuitarSelected(int position);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_select, container, false);
mViewPager = (ExtendedViewPager) rootView.findViewById(R.id.view_pager);
TouchImageAdapter touchImageAdapter = new TouchImageAdapter();
mViewPager.setAdapter(new TouchImageAdapter());
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
thisActivity = activity;
try {
mCallback = (onGuitarSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
private void chosenGuitarType(int position) {
Toast.makeText(thisActivity,
"Your Message " + position, Toast.LENGTH_SHORT).show();
mCallback.onGuitarSelected(position);
}
static class TouchImageAdapter extends PagerAdapter {
private static int[] images = { R.drawable.guitar1, R.drawable.guitar2 };
@Override
public int getCount() {
return images.length;
}
@Override
public View instantiateItem(final ViewGroup container, int position) {
final int pos = position;
TouchImageView img = new TouchImageView(container.getContext());
img.setImageResource(images[position]);
img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new SelectFragment().chosenGuitarType(pos);
}
});
container.addView(img, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
return img;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
}
我的活动代码:
package com.example.text.guitar;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import android.widget.Toast;
public class MainActivity2Activity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks, SelectFragment.onGuitarSelectedListener {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {@link #restoreActionBar()}.
*/
private CharSequence mTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
if (position == 0) {
fragmentManager.beginTransaction()
.replace(R.id.container, SelectFragment.newInstance())
.commit();
}
}
public void onGuitarSelected(int position) {
Toast.makeText(thisActivity,
"Position: " + position, Toast.LENGTH_SHORT).show();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_home);
break;
case 2:
mTitle = getString(R.string.title_primary);
break;
case 3:
mTitle = getString(R.string.title_bookmarks);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main_activity2, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我这样做了吗?我想把这个职位转回我的活动。
答案 0 :(得分:0)
我设法解决了自己的问题。
我将点击侦听器更改为...
img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SelectFragment fragment = (SelectFragment) thisActivity.getFragmentManager().findFragmentById(R.id.container);
fragment.chosenGuitarType(position);
}
});
如果有人好奇,这就是我正在使用的图书馆。我用一个点击监听器实现了一个图像滑块,这样我就可以点击转到另一个活动/片段。 https://github.com/MikeOrtiz/TouchImageView