Android 中 Toast 的基本用法

比较简单, 按照下面的文件复制运行即可.

Toast 是一个消息提示组件
设置显示的位置
自定义显示内容 (示例: 添加一个图片)
ToastUtil 类

ToastActivity 文件

package com.example.hello;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Toast;

import com.example.hello.util.ToastUtil;

public class ToastActivity extends AppCompatActivity {
    
    

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

    /**
     * 默认显示
     *
     * @param view view
     */
    public void showToastOne(View view) {
    
    
        Toast.makeText(getApplicationContext(), "Toast", Toast.LENGTH_SHORT).show();
    }

    /**
     * 居中显示
     *
     * @param view view
     */
    public void showToastTwo(View view) {
    
    
        Toast makeText = Toast.makeText(getApplicationContext(), "居中 Toast", Toast.LENGTH_SHORT);
        makeText.setGravity(Gravity.CENTER, 0, 0);
        makeText.show();
    }

    /**
     * 加载照片显示
     *
     * @param view view
     */
    @SuppressLint("InflateParams")
    public void showToastThree(View view) {
    
    
        Toast makeText = new Toast(getApplicationContext());
        LayoutInflater layoutInflater = LayoutInflater.from(ToastActivity.this);
        View inflate = layoutInflater.inflate(R.layout.layout_toast, null);
        makeText.setView(inflate);
        makeText.show();
    }

    /**
     * 抵消显示
     *
     * @param view view
     */
    public void showToastFour(View view) {
    
    
        ToastUtil.showShortToast(getApplicationContext(), "多次点击进行抵消, 封装的 Toast.");
    }
}

activity_toast 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ToastActivity">

    <Button
        android:id="@+id/btn_toast_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/toastDefault"
        android:onClick="showToastOne" />

    <Button
        android:id="@+id/btn_toast_2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/toastChangePosition"
        android:onClick="showToastTwo" />

    <Button
        android:id="@+id/btn_toast_3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/toastImage"
        android:onClick="showToastThree" />

    <Button
        android:id="@+id/btn_toast_4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/toastUtil"
        android:onClick="showToastFour" />

</LinearLayout>

layout_toast 文件

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

    <ImageView
        android:id="@+id/toast_iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/beautiful"
        android:scaleType="centerCrop"
        android:src="@mipmap/beautiful" />

</LinearLayout>

ToastUtil 文件

package com.example.hello.util;

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

public class ToastUtil {
    
    

    private static Toast shortToast;
    private static Toast longToast;

    @SuppressLint("ShowToast")
    public static void showShortToast(Context context, String message) {
    
    
        if (shortToast == null) {
    
    
            shortToast = Toast.makeText(context, message, Toast.LENGTH_SHORT);
        } else {
    
    
            shortToast.setText(message);
        }
        shortToast.show();
    }

    @SuppressLint("ShowToast")
    public static void showLongToast(Context context, String message) {
    
    
        if (longToast == null) {
    
    
            longToast = Toast.makeText(context, message, Toast.LENGTH_LONG);
        } else {
    
    
            longToast.setText(message);
        }
        longToast.show();
    }

}