Android UI控件系列：Toast（提示）

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。

注意：

length_long—长时间显示视图或文本提示

length_short—短时间显示视图或文本提示

setgravity(int gravity,int xoffset,int yoffset)—设置提示应该在屏幕上的显示的位置

setduration(int duartion)—设置提示显示的持续时间
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

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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

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() {
   @Override

   public 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;
  }
}
}

2.main,xml

3.custom.xml

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