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我正在开发一个应用程序，用户可以在edittexts中键入内容并通过滑动屏幕进入下一个视图。 swipe-stuff由viewpager处理。通过编程以块形式在视图页面中滑动页面编程
我想要做的是以下几点：
用户应该只能够在所有edittexts充满刷卡。目前我所有的编辑文本都有一个TextWatcher，一旦每个字段被填充，它就会将布尔值设置为“true”。当它是真的，我想启用viewpager，当它不是，我想禁用它。
我用三个片段使用CustomViewPager。我后我CustomViewPager代码：
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Toast;
public class CustomViewPager extends ViewPager {
private boolean isPagingEnabled;
public Context context;
public CustomViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
this.isPagingEnabled = true;
this.context = context;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (isPagingEnabled) {
return super.onTouchEvent(event);
}
Toast.makeText(context, "Please fill in the details, then swipe !",
Toast.LENGTH_LONG).show();
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
if (isPagingEnabled) {
return super.onInterceptTouchEvent(event);
}
return false;
}
public void setPagingEnabled(boolean b) {
isPagingEnabled = b;
}
}
PageViewActivity.java
public class PageViewActivity extends FragmentActivity {
MyPageAdapter pageAdapter;
int pageId=0;
public static CustomViewPager pager;
PageListener pageListener;
int currentPage=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
List<Fragment> fragments = getFragments();
pageAdapter = new MyPageAdapter(getSupportFragmentManager(), fragments);
pager =(CustomViewPager)findViewById(R.id.viewpager);
pager.setAdapter(pageAdapter);
pager.setPagingEnabled(false);
pageListener = new PageListener();
pager.setOnPageChangeListener(pageListener);
}
private List<Fragment> getFragments(){
List<Fragment> fList = new ArrayList<Fragment>();
fList.add(MyFragmentA.newInstance("Fragment 1"));
fList.add(MyFragmentB.newInstance("Fragment 2"));
fList.add(MyFragmentC.newInstance("Fragment 3"));
return fList;
}
public void next(View v){
if(pageId<=2)
{
pager.setCurrentItem(pageId);
}
pageId++;
}
private class PageListener extends SimpleOnPageChangeListener{
public void onPageSelected(int position) {
Log.i("test", "onPageSelected " + position);
currentPage = position;
}
//Called when the scroll state changes.
public void onPageScrollStateChanged(int state)
{
}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
Log.i("test", "onPageScrolled " + position);
currentPage = position;
}
}
}
我的页面适配器是这样的：
import java.util.List;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.widget.Toast;
class MyPageAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public MyPageAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
}最后我发表我的片段之一，唯一相关的代码：
public class MyFragmentA extends Fragment {
\t
\t EditText editname;
\t public static final String EXTRA_MESSAGE = "EXTRA_MESSAGE";
\t
\t
\t public static final MyFragmentA newInstance(String message)
\t {
\t MyFragmentA f = new MyFragmentA();
\t Bundle bdl = new Bundle(1);
\t bdl.putString(EXTRA_MESSAGE, message);
\t f.setArguments(bdl);
\t return f;
\t }
\t
\t @Override
\t public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
\t \t View myFragmentView = inflater.inflate(R.layout.fragment_a, container, false);
\t \t
\t \t
\t \t editname = (EditText)myFragmentView.findViewById(R.id.name_input);
\t \t
\t \t editname.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
\t if(editname.getText().toString().trim().length() == 0) {
\t \t
// Can I set here isPagingEnabled = false??
\t \t Toast.makeText(getActivity(), "SwipeFlag false!", Toast.LENGTH_SHORT).show();
\t
\t } else if(editname.getText().toString().trim().length() > 0) {
\t \t
// Can I set here isPagingEnabled = true??
\t \t Toast.makeText(getActivity(), "SwipeFlag true!", Toast.LENGTH_SHORT).show();
\t
\t }
}
});
\t \t
\t \t return myFragmentView;
\t } \t
\t \t \t \t \t \t
}我知道，关键点来阻止页面的滑动时的标志“isPagingEnabled”设置为false，但我不明白什么是从一个片段设置它的最佳方式在运行时。