Android开发——动态功能（一）Toast的常用操作：默认、居中、自定义

实现界面：

下面的代码里有注释帮助理解

常用方法：

Toast.makeText(ToastActivity.this,"要显示的文字", Toast.LENGTH_SHORT).show();    
//显示Toast，参数：当前页面内容，要显示的文字，显示的时长（Long与Short）
Toast.setGravity(Gravity.CENTER,0,0)    //设置居中
Toast.setView(view);    //自定义Toast的view

实现代码：

ToastActivity：java文件

package com.example.administrator.exercise;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.zip.Inflater;

public class ToastActivity extends AppCompatActivity implements View.OnClickListener{

    Button button_toast_default,button_toast_center,button_toast_design;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_toast);
        button_toast_default = (Button) findViewById(R.id.toast_default);
        button_toast_center = (Button) findViewById(R.id.toast_center);
        button_toast_design = (Button) findViewById(R.id.toast_design);
        button_toast_default.setOnClickListener(this);
        button_toast_center.setOnClickListener(this);
        button_toast_design.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.toast_default:{
                Toast.makeText(ToastActivity.this,"默认Toast", Toast.LENGTH_SHORT).show();    //显示Toast
                break;
            }
            case R.id.toast_center:{
                Toast ToastCenter = Toast.makeText(ToastActivity.this,"居中Toast", Toast.LENGTH_SHORT);   //创建Toast
                ToastCenter.setGravity(Gravity.CENTER,0,0);     //设置居中
                ToastCenter.show();     //显示Tosat
                break;
            }
            case R.id.toast_design:{
                Toast ToastDesign = new Toast(getApplicationContext());     //创建Toast
                LayoutInflater layoutInflater = LayoutInflater.from(ToastActivity.this);    //创建布局填充器
                View view1 = layoutInflater.inflate(R.layout.toast_item,null);      //填充布局
                ImageView imageView = (ImageView) view1.findViewById(R.id.toast_image);     //连接ImageView
                TextView textView = (TextView) view1.findViewById(R.id.toast_title);        //连接TextView
                imageView.setImageResource(R.drawable.icon_qq);     //设置ImageView的图片
                textView.setText("自定义Toast");       //设置TextView的文字
                ToastDesign.setView(view1);     //添加view到Toast
                ToastDesign.show();     //显示Toast
                break;
            }
        }
    }
}

 activity_toast.xml：布局文件

 toast_item：自定义Toast的布局文件

注：自定义Toast需要自定义布局文件，来提供自定义的视图view