Android SnackBar学习

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Android SnackBar学习

SnackBar是在android 5.0后新出的控件,可以用来替换传统的Toast方式.在一定程度上也可以用来替换Dialog控件.

使用方法

SnackBar在使用上和Toast相近,主要也是使用make方法及show方法.同时可以调用setAction方法,用于生成一个点击事件

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button snackBar, snackBarAction;
    private CoordinatorLayout coordinatorLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        coordinatorLayout = (CoordinatorLayout) findViewById(R.id.container);
        snackBar = (Button) findViewById(R.id.snackbar_click);
        snackBarAction = (Button) findViewById(R.id.snackbar_action);
        snackBar.setOnClickListener(this);
        snackBarAction.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        if (view.getId() == snackBar.getId()) {
            //无action,可以用于替换toast,可以被滑动撤销
            Snackbar.make(coordinatorLayout, "this is snack bars", Snackbar.LENGTH_LONG).show();
        } else if (view.getId() == snackBarAction.getId()) {
            Snackbar.make(coordinatorLayout, "this is snack bars", Snackbar.LENGTH_LONG)
                     //设置action,可用于点击,如OnclickListener为空,则看不到action
                    .setAction("action", new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            Log.d("LOG_PRINT","SnackBar action has click");
                        }
                    })
                    //此处可用于监听SnackBar消失
                    .setCallback(new Snackbar.Callback() {
                        @Override
                        public void onDismissed(Snackbar snackbar, int event) {
                            Log.d("LOG_PRINT","event is "+event);
                            super.onDismissed(snackbar, event);
                        }
                    }).show();
        }
    }
}

以下是于关event的定义

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.liupeng.study.MainActivity">

    <Button
        android:id="@+id/snackbar_click"
        android:layout_width="0dp"
        android:layout_height="51dp"
        android:text="snackbar"
        app:layout_constraintLeft_toLeftOf="@+id/activity_main"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        app:layout_constraintTop_toTopOf="@+id/activity_main"
        android:layout_marginTop="16dp"
        app:layout_constraintRight_toRightOf="@+id/activity_main"
        android:layout_marginRight="16dp"
        android:layout_marginEnd="16dp"
        app:layout_constraintHorizontal_bias="1.0" />

    <Button
        android:text="snack bar with action"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:id="@+id/snackbar_action"
        app:layout_constraintLeft_toLeftOf="@+id/activity_main"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        app:layout_constraintTop_toBottomOf="@+id/snackbar_click"
        android:layout_marginTop="24dp"
        app:layout_constraintRight_toRightOf="@+id/activity_main"
        android:layout_marginRight="16dp"
        android:layout_marginEnd="16dp" />
    <!-- SnackBar 父view ,可以保证SnackBar被滑动取消,不定义也可以使用-->
    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/container"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="@+id/activity_main"
        app:layout_constraintRight_toRightOf="@+id/activity_main"
        app:layout_constraintBottom_toBottomOf="@+id/activity_main" />
</android.support.constraint.ConstraintLayout>

以下是效果图