Android——常用代碼段積累（一）

1，Toast

                               // 登錄成功之後跳轉到home
				Toast.makeText(getApplicationContext(), 登陸成功！,
						Toast.LENGTH_SHORT).show();

2,簡單提示框

 AlertDialog.Builder builder = new Builder(home.this); 
	        builder.setMessage(確定要退出嗎?); 
	        builder.setTitle(提示); 
	        builder.setPositiveButton(確認, 
	                new android.content.DialogInterface.OnClickListener() { 
	                    @Override
	                    public void onClick(DialogInterface dialog, int which) { 
	                        dialog.dismiss(); 
	                        home.this.finish(); //關閉掉Activity
	                    } 
	                }); 
	        builder.setNegativeButton(取消, 
	                new android.content.DialogInterface.OnClickListener() { 
	                    @Override
	                    public void onClick(DialogInterface dialog, int which) { 
	                        dialog.dismiss(); 
	                    }
	                }); 
	        builder.create().show(); 

3，處理返回按鈕

/*處理返回按鈕的問題*/
	    @Override
	    public boolean onKeyDown(int keyCode, KeyEvent event) { 
	        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { 
	            dialog(); 
	            return false; 
	        } 
	        return false; 
	    }