前言

最近在做一个项目的时候要求使用一个弹出的效果，正好遇见如下的一个效果，

感觉效果很好看就用了

项目地址如下:Dragger

开始使用：(开发环境为Android Studio)

1. 在你的build.gradle文件中添加如下内容

repositories {
  maven {
    url "https://jitpack.io"
  }
}

dependencies {
  compile 'com.github.ppamorim:dragger:1.2'
}

2. 新建一个Main2Activity
   activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:padding="16dp"
        android:src="@mipmap/dragger"
        android:background="@color/gray"/>

</FrameLayout>

Main2Activity.java

public class Main2Activity extends DraggerActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        DraggerView draggerView = (DraggerView) findViewById(R.id.dragger_view);
        draggerView.setDraggerPosition(DraggerPosition.BOTTOM);
    }
}

3. 修改MainActivity.java
   在activity_main.xml中添加一个button后在MainActivity.java里面添加如下代码

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                startActivity(intent);
            }
        });
    }

解释

新建的Main2Activity其实就是那个效果中弹出的Activity，通过MainActivity中的按钮跳转到Main2Activity后执行
draggerView的setDraggerPosition的方法，其中参数为DraggerPosition.BOTTOM表示的是向下弹出，其他几种详见官方的例子

一些其他可以使用的方法

setDraggerCallback(DraggerCallback) //Interface that's provides some infos of the animation.
setSlideEnabled(boolean) //Enable or disable the drag, useful to use with ScrollViews.
setHorizontalDragRange(float) //Draggable distance that the draggableView can use, horizontally.
setVerticalDragRange(float) //Draggable distance that the draggableView can use, vertically.
setRunAnimationOnFinishInflate(boolean) //Run the initial animation, useful if you only want the drag function.
setDraggerLimit(float) //Set the max limit drag, default is 0.5 (center of the screen).
setDraggerPosition(DraggerPosition) //Set the position of archor.
setTension(float) //Tension of the animation. This represent with the friction, how much time the animation will be executed.
setFriction(float) //Friction of the animation. This represent with the tension, how much friction is applied at the tension animation.
show() //Show the drag view with Rebound animation.
closeActivity() //Simply close the activity with Rebound animation, based of the DraggerPosition choosen.