安卓Android Support Design Library——Snackbar

Posted NeilZhang

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介绍:

  Snackbarandroid Support Design Library库支持的一个控件,用于在界面下面提示一些关键信息,跟Toast不同的地方是SnackBar允许用户向右滑动消除它,同时,也允许在SnackBar中设定一个Action,当用户点击了SnackBar里面的按钮的时候,可以进行一些操作,所以,功能绝对是很强大的。

  官方推荐使用CoordinatorLayout(另一个Android Support Design Library库支持的控件)容纳。因为使用这个控件,可以保证Snackbar可以让用户通过向右滑动退出。

 

由浅入深:

1、基础功能:从底部弹出snackbar

在xml文件中定义snackBar的容器:Coordinator容器:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <Button
        android:onClick="createSnackbar"
        android:text="Snackbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"/>
</RelativeLayout>

activity中显示 Snackbar(它的用法与Toast很像,它出现后三秒之后从底部弹出,或者用户 向右滑动,它被滑出)

public class SnackbarTest extends AppCompatActivity {
    CoordinatorLayout container;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_snackbar_test);
        container = (CoordinatorLayout) findViewById(R.id.container);

    }
    public void createSnackbar(View v){
         Snackbar.make(container,"Snackbar maker", Snackbar.LENGTH_LONG).show();
    }
}

Snackbar的第一个容器参数也可以是 LinearLayout或其他容器,当Snackbar弹出时,没有向右滑出效果。

 

2、添加按钮,并定义点击事件

Snackbar.make(container,"Snackbar with button",Snackbar.LENGTH_LONG)
.setAction("action", new View.OnClickListener() {
@Override
public void onClick(View v) {
//
}
})
.setActionTextColor(Color.RED)
.show();

3、设置Snackbar回调 onshow 和 onDismissed

自定义 Snackbar.Callback 类

public class MyCallback extends Snackbar.Callback{
    @Override
    public void onDismissed(Snackbar transientBottomBar, int event) {
        super.onDismissed(transientBottomBar, event);
        if(event == DISMISS_EVENT_SWIPE || event == DISMISS_EVENT_TIMEOUT
                || event == DISMISS_EVENT_CONSECUTIVE){

        }
    }
    @Override
    public void onShown(Snackbar sb) {
        super.onShown(sb);
        //
    }
}

Snackbar设置callBack()

Snackbar.make(container,"Snackbar maker", Snackbar.LENGTH_LONG)
        .setCallback(new MyCallback())
        .show();

补充Snackbar消失的类型:

/** Indicates that the Snackbar was dismissed via a swipe.*/
public static final int DISMISS_EVENT_SWIPE = 0;
/** Indicates that the Snackbar was dismissed via an action click.*/
public static final int DISMISS_EVENT_ACTION = 1;
/** Indicates that the Snackbar was dismissed via a timeout.*/
public static final int DISMISS_EVENT_TIMEOUT = 2;
/** Indicates that the Snackbar was dismissed via a call to {@link #dismiss()}.*/
public static final int DISMISS_EVENT_MANUAL = 3;
/** Indicates that the Snackbar was dismissed from a new Snackbar being shown.*/
public static final int DISMISS_EVENT_CONSECUTIVE = 4;

 

后续查看补充:

http://www.jianshu.com/p/cd1e80e64311

 

Coordinator 容器:

http://www.jianshu.com/p/488283f74e69

http://www.cnblogs.com/itgungnir/p/6210803.html

 

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