Android——惯用代码段积累（一）

     1，Toast

                               // 登录成功之后跳转到home				Toast.makeText(getApplicationContext(), "登陆成功！",						Toast.LENGTH_SHORT).show();

     2,简单提示框

 AlertDialog.Builder builder = new Builder(home.this); 	        builder.setMessage("确定要退出吗?"); 	        builder.setTitle("提示"); 	        builder.setPositiveButton("确认", 	                new android.content.DialogInterface.OnClickListener() { 	                    @Override	                    public void onClick(DialogInterface dialog, int which) { 	                        dialog.dismiss(); 	                        home.this.finish(); //关闭掉Activity	                    } 	                }); 	        builder.setNegativeButton("取消", 	                new android.content.DialogInterface.OnClickListener() { 	                    @Override	                    public void onClick(DialogInterface dialog, int which) { 	                        dialog.dismiss(); 	                    }	                }); 	        builder.create().show(); 

     3，处理返回按钮

/*处理返回按钮的问题*/	    @Override	    public boolean onKeyDown(int keyCode, KeyEvent event) { 	        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { 	            dialog(); 	            return false; 	        } 	        return false; 	    }