我正在开发一个应用程序，用户可以在其中输入编辑文本中的内容，然后通过滑动屏幕进入下一个 View 。滑动操作由 viewpager 处理。
我想做的是:
只有当所有编辑文本都被填满时，用户才能滑动。目前，我所有的 edittexts 都有一个 TextWatcher，一旦每个字段都被填充，它就会将 bool 值设置为“true”。如果为真，我想启用 viewpager，如果不是，我想禁用它。
我正在使用带有三个 Fragment 的 CustomViewPager。我发布我的 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，我发布了一个包含唯一相关代码的 fragment :
public class MyFragmentA extends Fragment {
EditText editname;
public static final String EXTRA_MESSAGE = "EXTRA_MESSAGE";
public static final MyFragmentA newInstance(String message)
{
MyFragmentA f = new MyFragmentA();
Bundle bdl = new Bundle(1);
bdl.putString(EXTRA_MESSAGE, message);
f.setArguments(bdl);
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.fragment_a, container, false);
editname = (EditText)myFragmentView.findViewById(R.id.name_input);
editname.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(editname.getText().toString().trim().length() == 0) {
// Can I set here isPagingEnabled = false??
Toast.makeText(getActivity(), "SwipeFlag false!", Toast.LENGTH_SHORT).show();
} else if(editname.getText().toString().trim().length() > 0) {
// Can I set here isPagingEnabled = true??
Toast.makeText(getActivity(), "SwipeFlag true!", Toast.LENGTH_SHORT).show();
}
}
});
return myFragmentView;
}
}我知道阻止页面滑动的关键点是将标志“isPagingEnabled”设置为 false，但我不明白在运行时从 Fragment 设置它的最佳方法是什么。
最佳答案
好吧，我终于找到了一个解决方案，并将其发布在这里。阻止页面滑动的最佳方法是控制是否在 PageViewActivity.java(我的 MainActivity..)中的 onPageScrolled 内填充了编辑文本:
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
Log.i("test", "onPageScrolled - position = " + position);
currentPage = position;
txt1 = (EditText) findViewById(R.id.name_input);
if(position == 0) {
if(txt1.getText().toString().trim().length() == 0) {
pager.setCurrentItem(0);
} else if(txt1.getText().toString().trim().length() > 0) {
// DO NOTHING
}
}
}以这种方式，在您的 fragment 的 edittext 字段被填充之前不允许页面滑动。
另一种阻止页面滑动的明智方法，但只有在正确的方向上，才能以这种方式修改 onPageSelected:
boolean inibitFlag = false;
int maxAllowedPage = 1; // .. or you can set this value in your fragment..
public void onPageSelected(int position) {
Log.i("test", "onPageSelected " + position);
if(inibitFlag)
return;
if(position > maxAllowedPage) {
inibitFlag = true;
pager.setCurrentItem(currentPage);
inibitFlag = false;
} else {
currentPage = position;
}
}希望这对某人有帮助!!
关于android - 以编程方式阻止 View 寻呼机中的页面滑动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26163578/