UI-Toast

ToastUtils

import android.annotation.SuppressLint;
import android.content.Context;
import android.view.Gravity;
import android.widget.Toast;

public class ToastUtils {
    private static Toast sToast;


    private ToastUtils() {

    }

    public static void showToast(Context context, String text) {
        showToastInner(context, text, Toast.LENGTH_SHORT);
    }

    public static void showToast(Context context, int stringId) {
        showToastInner(context, context.getString(stringId), Toast.LENGTH_SHORT);
    }


    public static void showToastLong(Context context, String text) {
        showToastInner(context, text, Toast.LENGTH_LONG);
    }

    public static void showToastLong(Context context, int stringId) {
        showToastInner(context, context.getString(stringId), Toast.LENGTH_LONG);
    }

    private static void showToastInner(Context context, String text, int duration) {
        ensureToast(context);
        sToast.setText(text);
        //居中显示
        sToast.setGravity(Gravity.CENTER, 0, 0);
        //显示时长
        sToast.setDuration(duration);
        sToast.show();
    }


    @SuppressLint("ShowToast")
    private static void ensureToast(Context context) {
        if (sToast != null) {
            return;
        }
        synchronized (ToastUtils.class) {
            if (sToast != null) {
                return;
            }
            sToast = Toast.makeText(context.getApplicationContext(), " ", Toast.LENGTH_SHORT);
        }
    }
}

居中显示带自定义布局

public class Toastutil {
    private static Toast odltoast;

    /**
     * 短暂显示Toast消息
     *
     * @param context
     * @param message
     */
    public static void showShortToast(Context context, Object message) {
        if (message == null) {
            message = "";
        }
        if (context != null) {
            Toast mytoast = Toast.makeText(context.getApplicationContext(), message.toString(), Toast.LENGTH_SHORT);//用getApplicationContext防止内存溢出
            mytoast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
            cancelToast();
            odltoast = mytoast;
            mytoast.show();
        }
    }

    //先隐藏再显示新的（效果是最终会显示最后一条toast内容）
    public static void cancelToast() {
        if (odltoast != null) {
            odltoast.cancel();
        }
    }

    /**
     * 短暂显示Toast消息
     *
     * @param context
     * @param message
     */
    public static void showlongToast(Context context, Object message) {
        if (message == null) {
            message = "";
        }
        if (context != null) {
            Toast mytoast = Toast.makeText(context.getApplicationContext(), message.toString(), Toast.LENGTH_LONG);//用getApplicationContext防止内存溢出
            mytoast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
            cancelToast();
            odltoast = mytoast;
            mytoast.show();
        }
    }

    /**
     * 居中展示，带自定义布局
     * @param context
     * @param message
     * @param duration
     */
    public static void showToastCustomView(Context context, Object message, int duration) {
        if (message == null) {
            message = "";
        }
        if (context != null) {
            //使用布局加载器，将编写的toast_layout布局加载进来
            View view = LayoutInflater.from(context).inflate(R.layout.toast_layout, null);
            //获取TextView
            TextView title = (TextView) view.findViewById(R.id.toast_tv);
            //设置显示的内容
            title.setText(message.toString());
            Toast toast = new Toast(context);
            toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
            //设置显示时间
            toast.setDuration(duration);
            toast.setView(view);
            cancelToast();
            odltoast = toast;
            toast.show();
        }
    }
}

toast_layout.xml自定义toast的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:background="@drawable/shape_corner_90_color_999999">


    <TextView
        android:id="@+id/toast_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="20dp"
        android:layout_marginBottom="10dp"
        android:gravity="center"
        android:text="一段很长的测试文字"
        android:textColor="@color/text_big"
        android:textSize="18sp" />
</LinearLayout>

shape_corner_90_color_999999.xml圆角背景

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#999999" />
    <corners android:radius="90dp" />
</shape>

Toast问题

Toast运行在子线程问题，handler问题：Can't toast on a thread that has not called Looper.prepare()

正确写法：

new Thread(new Runnable() {
    @Override
    public void run() {
        Looper.prepare();
        ToastUtils.showRoundRectToast("潇湘剑雨-杨充");
        Looper.loop();
    }
}).start();