Android中Toast的用法简介

 

Toast是Android中用来显示显示信息的一种机制，和Dialog不一样的是，Toast是没有焦点的，而且Toast显示的时间有限，过一定的时间就会自动消失。下面用一个实例来看看如何使用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：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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:padding="5dip" android:gravity="center">
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:id="@+id/btnSimpleToast"
android:text="默认"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:text="自定义显示位置"
android:id="@+id/btnSimpleToastWithCustomPosition"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:id="@+id/btnSimpleToastWithImage"
android:text="带图片"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:text="完全自定义"
android:id="@+id/btnCustomToast"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:text="其他线程"
android:id="@+id/btnRunToastFromOtherThread"></Button>
</LinearLayout>

 

 

 

 

 

3.custom.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content" android:layout_width="wrap_content"
android:background="#ffffffff" android:orientation="vertical"
android:id="@+id/llToast" >
<TextView
android:layout_height="wrap_content"
android:layout_margin="1dip"
android:textColor="#ffffffff"
android:layout_width="fill_parent"
android:gravity="center"
android:background="#bb000000"
android:id="@+id/tvTitleToast" />
<LinearLayout
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/llToastContent"
android:layout_marginLeft="1dip"
android:layout_marginRight="1dip"
android:layout_marginBottom="1dip"
android:layout_width="wrap_content"
android:padding="15dip"
android:background="#44000000" >
<ImageView
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:id="@+id/tvImageToast" />
<TextView
android:layout_height="wrap_content"
android:paddingRight="10dip"
android:paddingLeft="10dip"
android:layout_width="wrap_content"
android:gravity="center"
android:textColor="#ff000000"
android
a5d0
:id="@+id/tvTextToast" />
</LinearLayout>
</LinearLayout>

 

作者：GangWang

出处：http://www.cnblogs.com/GnagWang/

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