1. 首先新建一个Android程序

2. activity_main 文件的代码如下

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

       xmlns:tools="http://schemas.android.com/tools"

       android:orientation="vertical"

       android:layout_width="match_parent"

       android:layout_height="match_parent"

       android:paddingBottom="@dimen/activity_vertical_margin"

       android:paddingLeft="@dimen/activity_horizontal_margin"

       android:paddingRight="@dimen/activity_horizontal_margin"

       android:paddingTop="@dimen/activity_vertical_margin"

       tools:context="com.example.toast.MainActivity" >

   
   

       <Button

           android:id="@+id/totastshort"

           android:layout_width="fill_parent"

           android:layout_height="wrap_content"

           android:text="按钮1" />

   
   

       <Button

           android:id="@+id/totastlong"

           android:layout_width="fill_parent"

           android:layout_height="wrap_content"

           android:text="long" />

   
   

   </LinearLayout>

3. MainActivity.java文件的代码如下

   
   

   package com.example.toast;

   
   

   import android.app.Activity;

   import android.os.Bundle;

    import android.view.Gravity;

    import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends Activity {

private Button totast1;

private Button totast2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

totast1=(Button) findViewById(R.id.totastshort);

totast1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

Toast t=Toast.makeText(MainActivity.this,"hello my first short totast",Toast.LENGTH_SHORT);

t.setGravity(Gravity.CENTER, -10, 0);

t.show();

}

});

totast2=(Button) findViewById(R.id.totastlong);

totast2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

Toast t1=Toast.makeText(MainActivity.this, "long totast",Toast.LENGTH_LONG);

ImageView i=new ImageView(MainActivity.this);

i.setImageResource(R.drawable.ic_launcher);

t1.setView(i);

t1.show();

}

} );

}

}

4.注意:最后不要忘记totast的show().