Android studio断点调试

港控/mmm° 2023-07-13 10:38 14阅读 0赞

# **如果使用断点调试** #

1.判断大概哪个地方出现了问题  
2.在怀疑的代码旁加上断点  
3.点击调试运行  
4.程序到断点的地方停下来,接下来我们就一步步开始即可  
5.没有5了,断点调试超级方便

# **来个小例子感受一下** #

**1.在怀疑的代码上加上断点:**

![这里写图片描述][SouthEast]

**2.点击debug调试**

![这里写图片描述][SouthEast 1]

**3.程序执行到断点出就可以调试了**

![这里写图片描述][SouthEast 2]

**4.断点按钮组选择直接执行到下一行代码,还是到方法里面一步步执行,我这里选择进入方法,是不是能看到每一行的值**

![这里写图片描述][SouthEast 3]

这样是不是比打印日志好多了.是吧?是的.

# **关于断点调试,我们应该知道的事** #

## **一、调试步骤** ##

**1.添加断点**  
方法: 如上图,在代码编辑区显示行数的左边空白区域,单击鼠标  
**2.debug**  
两种开启调试的方法:  
**debug调试:**  
**开始方法:** 点击绿色小昆虫图标![这里写图片描述][SouthEast 4]开始调试  
**适用场景:**程序未运行,点击debug,开始调试模式运行.

**attach debugger to Android Progress:**  
**开始方法:**点击![这里写图片描述][SouthEast 5] 开始调试  
**适用场景:**程序已经运行了,这个时候想要调试了,不需要重新debug重新开始程序,可以选择直接点击attach debugger,选择要调试的进程,直接进入调试模式.

**3.执行到断点,开始调试**  
这一步主要是要看我们的debug面板(就是下面这个),分为几个部分,  
(1)断点单步调试区  
(2)断点管理区  
(3)调试信息观察区

![这里写图片描述][SouthEast 6]

## **二、断点单步调试区功能介绍** ##

**Step Over(F6) : 执行到下一行代码**

![这里写图片描述][SouthEast 7]

示例：  
![这里写图片描述][SouthEast 8]

![这里写图片描述][SouthEast 9]

**Step Into(F5):进入到当前方法中，仅限于自定义的方法，系统方法进不去**

![这里写图片描述][SouthEast 10]

示例：  
![这里写图片描述][SouthEast 9]

![这里写图片描述][SouthEast 11]

**Force Step Into(Alt +Shift+F7):强制进入方法,包括系统方法**

![这里写图片描述][SouthEast 12]

示例：  
![这里写图片描述][SouthEast 13]

![这里写图片描述][SouthEast 14]

**Step Out(F7) : 跳出方法或者下一个断点，就直接到下一个断点（跳到下一个断点这个功能的我不常用,一般使用左侧断点管理区的绿色小三角按钮）**

![这里写图片描述][SouthEast 15]

示例 （跳出方法）：  
![这里写图片描述][SouthEast 16]

![这里写图片描述][SouthEast 17]

**Run To Cursor(Ctrl+R): 快速进入当前代码执行的地方，多用于循环**

![这里写图片描述][SouthEast 18]

示例（直接从i=0到i=1的位置）：  
![这里写图片描述][SouthEast 19]

![这里写图片描述][SouthEast 20]

**Evaluate Expression (Ctrl+U): 表达式求值**

![这里写图片描述][SouthEast 21]

示例:  
![这里写图片描述][SouthEast 22]

## **三、断点管理区功能介绍** ##

**Resume Program(F8):直接跳到下个断点,不过没有下个断点,就直接结束了调试**

![这里写图片描述][SouthEast 23]

**Pause Program: 暂停调试**

![这里写图片描述][SouthEast 24]

**Stop(Ctrl+F2): 直接结束调试**

![这里写图片描述][SouthEast 25]

**View Breakpoints(Ctrl+Shift+F8): 查看设置的断点们**

![这里写图片描述][SouthEast 26]

**Mute Breakpoints: 将设置的全部断点的状态置为无效,有点取反的意思,当有效的时候点击断点全部变为有效,反之无效变为无效**

![这里写图片描述][SouthEast 27]

**Get thread dump: 获取线程的帧栈区,包括线程的名称,运行状态等**

![这里写图片描述][SouthEast 28]

**Setting: 关于断点调试的一些设置**

![这里写图片描述][SouthEast 29]

有以下的值:

<table> 
 <thead> 
  <tr> 
   <th>名称</th> 
   <th align="center">功能解释</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>Show Values Inline</td> 
   <td align="center">调试过程中开启该功能,将会代码右边显示变量值,默认开启</td> 
  </tr> 
  <tr> 
   <td>Show Method Return Values</td> 
   <td align="center">调试过程中开启该功能,将在变量区显示最后执行方法的返回值 ,默认不开启</td> 
  </tr> 
  <tr> 
   <td>Auto-Variables Mode</td> 
   <td align="center">开启这个功能后,idea的Debugger会自动评估某些变量,大概就是当你执行在某个断点时,Debugger会检测当前调试点之前或者之后的变量的状态,然后在变量区选择性输出,例如下面没调用这个变量了,那这个变量就不显示在变量区了. 默认不开启</td> 
  </tr> 
  <tr> 
   <td>Sort values alphabetically</td> 
   <td align="center">开启这个功能的化,变量区中的输出内容,例如变量名或者方法名,会按照按字母顺序进行排序,默认不开启</td> 
  </tr> 
 </tbody> 
</table>

如果这些描述,小伙伴们想知道具体勾选与不勾选,影响了什么,可以自己点击试试,那才是最生动形象的演示,请相信我,我只是懒的贴图了.

## **四、调试信息显示区** ##

**1、对象变量区-Variables窗口**  
这个窗口是主要显示debug下,代码执行处的变量的值,你可以对显示的值做一些操作,  
例如:  
SetValue–手动设置指定的值  
Evaluate Expression –计算表达式  
Add to Watches–添加到Watches窗口  
等等,这里不列了,小伙伴们大可都去试试  
![这里写图片描述][SouthEast 30]

**2、变量观察区- Watches窗口**

观察窗口,顾名思义,就是专门用来观察数据的值得窗口.这个窗口存在的意义是,如果多个标量或者多个表达式在多个不同的地方，要上下观察是很麻烦的，我们可以把它Add to Watchs, 然后在观察窗口就可以一次看到多个变量值;  
添加到这个窗口的方式有以下几种:  
1、变量右键选择 Add to Watches  
2、Watches窗口中点击+号,输入观察的数据,这里我要提醒小伙伴一下,这里不限于是变量的名称,你完全可以数据一个表达式什么的,例如a+5,a >0等等,非常方便.

![这里写图片描述][SouthEast 31]

**3、线程帧栈区- Frames窗口和Threads窗口**

说实话，这个窗口我没自己实践过，只是大概知道是做线程调试的,想想都很强大,等我研究一下,用过再来写

**AndroidStudio还提供了让调试更加快捷的一些小技巧~再写下去篇幅就太长了**  
**新开一篇,可爱的传送门在这里 [AndroidStudio-断点调试-让你的调试更有效率][AndroidStudio-_-]**

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[AndroidStudio-_-]: http://blog.csdn.net/qq_32452623/article/details/53983563