Android 按钮弹出提示框问题

你改成这样试试：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button1=(Button)findViewById(R.id.button1);
button1.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
AlertDialog.Builder builder= new AlertDialog.Builder(this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle(title);
builder.setMessage(msg);
builder.setPositiveButton("确认", null);
builder.create().show();
}
});
}