在写Toast之前我们应该需要了解下 Toast是干什么的 或者说他是用来完成那些事情的，为了便于大家理解呢，我以我自己理解的程度来给大家举例子 Toast 英语是 “吐司”的意思，但是为什么要将它取这个名字我不是很理解，现在我说下我理解的toast 的用途，我们可以将 toast理解成为一种通知，，也就是我们在操作Android 之后 Android系统反馈给我们的信息，或者数据！
我们将toast理解为是一种通知，下面的样式我们就可以理解为不同形式的通知了，例如有的通知就是一张白纸然后上面的黑字，还有的或许就华丽些了，采用的是 彩纸 和 彩笔 后来更华丽了，那我估计就应该是 “请柬” 这种样子了！可以做到 图文并茂的效果了！
下面让我们一起来看看这些 “通知单”的效果！
Toast用于向用户显示一些帮助/提示。下面我做了5中效果，来说明Toast的强大，定义一个属于你自己的Toast。
1.默认效果
代码：
Toast.makeText(getApplicationContext(), "默认Toast样式", Toast.LENGTH_SHORT).show();
2.自定义显示位置效果
代码
toast = Toast.makeText(getApplicationContext(),"自定义位置Toast", Toast.LENGTH_LONG);toast.setGravity(Gravity.CENTER, 0, 0); toast.show();
3.带图片效果
代码
toast = Toast.makeText(getApplicationContext(),"带图片的Toast", Toast.LENGTH_LONG);toast.setGravity(Gravity.CENTER, 0, 0);LinearLayout toastView = (LinearLayout) toast.getView();ImageView imageCodeProject = new ImageView(getApplicationContext());imageCodeProject.setImageResource(R.drawable.icon);toastView.addView(imageCodeProject, 0);toast.show();
4.完全自定义效果
代码：
LayoutInflater inflater = getLayoutInflater();View layout = inflater.inflate(R.layout.custom,(ViewGroup) findViewById(R.id.llToast));ImageView image = (ImageView) layout.findViewById(R.id.tvImageToast);image.setImageResource(R.drawable.icon);TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);title.setText("Attention");TextView text = (TextView) layout.findViewById(R.id.tvTextToast);text.setText("完全自定义Toast");toast = new Toast(getApplicationContext());toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);toast.setDuration(Toast.LENGTH_LONG);toast.setView(layout);toast.show();
5.其他线程
代码
new Thread(new Runnable() {public void run() {showToast();}}).start();
完整代码
java Activity 程序代码：
1.Main,java
package com.wjq.toast;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;public class Main extends Activity implements OnClickListener { Handler handler = new Handler();@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main);findViewById(R.id.btnSimpleToast).setOnClickListener(this); findViewById(R.id.btnSimpleToastWithCustomPosition).setOnClickListener(this); findViewById(R.id.btnSimpleToastWithImage).setOnClickListener(this); findViewById(R.id.btnCustomToast).setOnClickListener(this); findViewById(R.id.btnRunToastFromOtherThread).setOnClickListener(this);}public void showToast() { handler.post(new Runnable() {@Overridepublic void run() {Toast.makeText(getApplicationContext(), "我来自其他线程！",Toast.LENGTH_SHORT).show();} }); }@Override public void onClick(View v) { Toast toast = null; switch (v.getId()) { case R.id.btnSimpleToast:Toast.makeText(getApplicationContext(), "默认Toast样式",Toast.LENGTH_SHORT).show();break; case R.id.btnSimpleToastWithCustomPosition:toast = Toast.makeText(getApplicationContext(),"自定义位置Toast", Toast.LENGTH_LONG);toast.setGravity(Gravity.CENTER, 0, 0);toast.show();break; case R.id.btnSimpleToastWithImage:toast = Toast.makeText(getApplicationContext(),"带图片的Toast", Toast.LENGTH_LONG);toast.setGravity(Gravity.CENTER, 0, 0);LinearLayout toastView = (LinearLayout) toast.getView();ImageView imageCodeProject = new ImageView(getApplicationContext());imageCodeProject.setImageResource(R.drawable.icon);toastView.addView(imageCodeProject, 0);toast.show();break; case R.id.btnCustomToast:LayoutInflater inflater = getLayoutInflater();View layout = inflater.inflate(R.layout.custom,(ViewGroup) findViewById(R.id.llToast));ImageView image = (ImageView) layout.findViewById(R.id.tvImageToast);image.setImageResource(R.drawable.icon);TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);title.setText("Attention");TextView text = (TextView) layout.findViewById(R.id.tvTextToast);text.setText("完全自定义Toast");toast = new Toast(getApplicationContext());toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);toast.setDuration(Toast.LENGTH_LONG);toast.setView(layout);toast.show();break; case R.id.btnRunToastFromOtherThread:new Thread(new Runnable() {public void run() {showToast();}}).start();break;}}}
布局文件
不如意的时候不要尽往悲伤里钻，想想有笑声的日子吧
