PullSwitcher

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Help to switch fragment easier

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# PullSwitcher

This library is learn from [liaohuqiu/android-Ultra-Pull-To-Refresh](https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh) and learn the 
pull to next layout effect from [zzz40500/Android-PullToNextLayout](https://github.com/zzz40500/Android-PullToNextLayout), this fragments adapter make the fragment hide or show in the activity. So, you can keep data in those.

The child of the pushswitcherview in the fragment must be **NestedScrollingChild**, such as a RecyclerView, NestedScrollView and viewpager wrap pre-view

Screeshot
====
![](https://raw.githubusercontent.com/loopeer/PullSwitcher/master/screenshot/screenshot.gif)

Installation
====
```groovy
dependencies {
    compile 'com.loopeer.library:pullswitcherview:1.0.6'
}
```

Usage
====
###1. Add adapter and holder in activity

```java
    private SwitcherAdapter adapter;
    private SwitcherHolder mSwitchHolder;
    
    ...{
        mSwitchHolder = new SwitcherHolder(containerLayout);
        adapter = new TestSwitcherAdapter(getSupportFragmentManager());
        mSwitchHolder.setAdapter(adapter);
        }

```
Then, create your custom switcher adapter.
```java
public class TestSwitcherAdapter extends SwitchFragmentAdapter {

public TestSwitcherAdapter(FragmentManager fm) {
        super(fm);
    }

@Override
    public Fragment getItem(int position) {
        Fragment fragment;
        switch (position) {
            case 0:
                fragment = TestFragment1Recycler.newInstance(getSwitcherHolder());
                break;
            case 1:
                fragment = TestFragment2Scroll.newInstance(getSwitcherHolder());
                break;
            case 2:
                fragment = TestFragment3ViewPager.newInstance(getSwitcherHolder());
                break;
            default:
                fragment = null;
        }
        return fragment;
    }

@Override
    public int getCount() {
        return 3;
    }
}
```
###2. Create cutom fragment

You can create the single fragment or view by the **PullSwitchView**, add the layout. set the **PullSwitchView** as your layou which layout you want to move. PullSwitchView can host only one direct child. And the footer and header must implements FooterImpl or HeaderImpl. The pullSwitchView will add header and footer for you by default. But you can set your custom view which must implements the Impl.
```xml
<?xml version="1.0" encoding="utf-8"?>
<com.loopeer.android.librarys.PullSwitchView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/switcher"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#dddddd">

<android.support.v7.widget.RecyclerView
            android:id="@+id/my_recycler_view"
            android:scrollbars="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

</LinearLayout>

</com.loopeer.android.librarys.PullSwitchView>
```
init your pullswitchview
```java
    private void initSwitchView(View view) {
        pullSwitchView = (PullSwitchView) view.findViewById(R.id.switcher);
        pullSwitchView.setSwitcherHolder(switcherHolder);
    }
```

If you want go back by press the back key, you should add this in activity:
```java
    @Override
    public void onBackPressed() {
        mSwitchHolder.doBack();
    }
```

####You can add switcher listener
```java

public class TestFragment1Recycler extends Fragment implements PullHandler, SwitchListener {
    ...

@Override
    public void onPagePause() {
        Toast.makeText(getActivity(), "test recycler pause", Toast.LENGTH_SHORT).show();
    }

@Override
    public void onPageResume() {
        Toast.makeText(getActivity(), "test recycler resume", Toast.LENGTH_SHORT).show();
    }
}
```

####You can add your custom footer and header view  
create your custom view and implements the footer
```java 
        pullSwitchView.setFooterView(new TestCustomFooterView(getActivity()));

```
and the custom footer can set your pull tips 
```java
public class TestCustomFooterView extends TextView implements Footer{

public TestCustomFooterView(Context context) {
        this(context, null);
    }

public TestCustomFooterView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

public TestCustomFooterView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setPadding(20, 20, 20, 20);
        setGravity(Gravity.CENTER);
    }

@Override
    public void onMoveStart(int currentPosY, int startSwitchOffset, CharSequence string) {
        setText("Test custom footer text onMoveStart");
    }

@Override
    public void onCanStartSwitch(int currentPosY, int startSwitchOffset, CharSequence string) {
        setText("Test custom footer text onCanStartSwitch");

}
}
```

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
</pre>

PullSwitcher

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