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Asilbek199816 committed Jul 3, 2019
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# SwipeBackFragment
An Android library that can finish a Fragment&Activity with swipe-back gesture.

滑动Fragment&Activity边缘即可类似IOS一样,拖动返回。

原理分析:[传送门](http://www.jianshu.com/p/626229ca4dc2), 如果你重度使用Fragment,不妨看看这个库[Fragmentation](https://github.com/YoKeyword/Fragmentation)

# 特性
注: 滑动返回仅支持通过add方式加载的Fragment, replace不支持

1、Activity内Fragment数大于1时,滑动返回的是Fragment,否则滑动返回的是Activity

2、支持左、右、左&右滑动(未来可能会增加更多滑动区域)

3、支持Swipe时的滑动监听

4、帮你处理了Fragment重叠的情况

# Demo演示
<img src="gif/swipe.gif"/>

# 如何使用
1、项目下app的build.gradle中依赖:
````gradle
// appcompat v7包是必须的
compile 'me.yokeyword:swipebackfragment:0.4.0'
````
2、如果Activity也需要支持SwipeBack,则继承SwipeBackActivity:
````java
public class SwipeBackSampleActivity extends SwipeBackActivity {}
````
同时该Activity的theme添加如下属性:
````xml
<item name="android:windowIsTranslucent">true</item>
````

3、如果Fragment需要支持SwipeBack,则继承SwipeBackFragment:
````java
public class SwipeBackSampleFragment extends SwipeBackFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.xxx, container, false);
// 需要支持SwipeBack则这里必须调用toSwipeBackFragment(view);
return attachToSwipeBack(view);
}
}
````

更多方法:
````java
// 设置滑动方向
getSwipeBackLayout().setEdgeOrientation(SwipeBackLayout.EDGE_RIGHT); // EDGE_LEFT(默认),EDGE_ALL
// 设置侧滑触摸生效区域 MAX,MED,MIN,custom
setEdgeLevel(SwipeBackLayout.EdgeLevel edgeLevel)
// 滑动过程监听
getSwipeBackLayout().addSwipeListener(new SwipeBackLayout.OnSwipeListener() {
@Override
public void onDragStateChange(int state) {
// Drag state
}

@Override
public void onEdgeTouch(int edgeFlag) {
// 触摸的边缘flag
}

@Override
public void onDragScrolled(float scrollPercent) {
// 滑动百分比
}
});

// 对于SwipeBackActivity有下面控制SwipeBack优先级的方法:
/**
* 限制SwipeBack的条件,默认栈内Fragment数 <= 1时 , 优先滑动退出Activity , 而不是Fragment
*
* 可以通过复写该方法, 自由控制优先级
*
* @return true: Activity可以滑动退出, 并且总是优先; false: Activity不允许滑动退出
*/
@Override
public boolean swipeBackPriority() {
return super.swipeBackPriority();
// 下面是默认实现:
// return getSupportFragmentManager().getBackStackEntryCount() <= 1;
}
````

# 致谢
[ikew0ng/SwipeBackLayout](https://github.com/ikew0ng/SwipeBackLayout)

# BackFragment
# BackFragment
# BackFragment
Asilbek

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