1、AlertDialog是一个信息提示框，当出现是，需要用户点击，才会消失
2、Toast也是一个信息提示框，出现后会更具设定的时间，自动消失
[代码] 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"
>
<ButtonAndroid:id="@+id/alert"
Android:layout_width="fill_parent"
Android:layout_height="wrap_content"
Android:text="Make an alert"></Button>
<ButtonAndroid:id="@+id/toast"
Android:layout_width="fill_parent"
Android:layout_height="wrap_content"
Android:text="Make a toast"></Button>
</LinearLayout>
[代码] MessageActivity.java
package yyl.message;
import Android.app.Activity;
import Android.app.AlertDialog;
import Android.content.DialogInterface;
import Android.os.Bundle;
import Android.view.View;
import Android.widget.Button;
import Android.widget.Toast;
public class MessageActivity extends Activity {
//定义变量
private Button alert = null;
private Button toast = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//根据Id得到控件对象
alert = (Button)findViewById(R.id.alert);
toast = (Button)findViewById(R.id.toast);
//给按钮设定单击事件监听器
alert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//显示AlertDialog
new AlertDialog.Builder(MessageActivity.this).setTitle("MessageDemo").setMessage("Err").setNeutralButton("close", new DialogInterface.OnClickListener() {
//点击AlertDialog上的按钮的事件处理代码
@Override
public void onClick(DialogInterface dialog, int which) {
System.out.println("yangyulin");
}
}).show();
}
});
toast.setOnClickListener(new View.OnClickListener() {
//显示Toast
@Override
public void onClick(View v) {
Toast.makeText(MessageActivity.this, "<Clink,Clink>", Toast.LENGTH_SHORT).show();
}
});
}
}
