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Android基础之Activity生命周期.html
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Android基础之Activity生命周期.html
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我们先来看一张非常经典的Activity生命周期流程图：">
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<section id="main"><article id="post-Android基础之Activity生命周期" class="article article-type-post" itemscope itemprop="blogPost">
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Android基础之Activity生命周期
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<a class="tag-link" href="/tags/Activity/">Activity</a>, <a class="tag-link" href="/tags/Android/">Android</a>, <a class="tag-link" href="/tags/生命周期/">生命周期</a>
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<p>之前一直对Activity的生命周期不是很清楚，感觉很模糊。前两天也看了下任玉刚书里对Activity生命周期的讲解，今天特意写了个程序验证了下Activity的生命周期内各个回调的执行情况，为了避免多段时日又忘了，干脆对这次的理解总结下，俗话说好记性不如烂笔头，没事的时候可以回过头来再看看。</p>
<p>我们先来看一张非常经典的Activity生命周期流程图：<br><a id="more"></a></p>
<p><img src="/img/2016072822.png" alt=""></p>
<p>Activity的生命周期大致有如下几个成果：</p>
<ol>
<li>启动Activity：系统会先调用onCreate，然后调用onStart，最后调用onResume，此时Activity进入前台处于运行状态。如图：</li>
</ol>
<p><img src="/img/2016072823.png" alt=""></p>
<p><img src="/img/2016072824.png" alt=""></p>
<ol>
<li>当前Activity被其他Activity覆盖，且覆盖的这个Activity是为透明：系统只会调用onPause，此时Activity处于后台可见暂停运行状态。如图：</li>
</ol>
<p><img src="/img/2016072825.png" alt=""></p>
<p><img src="/img/2016072826.png" alt=""></p>
<ol>
<li>当前Activity被其他Activity覆盖，且覆盖的这个Activity为非透明：系统处理过程与步骤4中的过程是一样的。如图：</li>
</ol>
<p><img src="/img/2016072827.png" alt=""></p>
<p><img src="/img/2016072828.png" alt=""></p>
<ol>
<li>手机锁屏或按下了Home键：系统会先调用onPause，最后调用onStop，此时Activity处于后台非可见暂停运行状态。如图：</li>
</ol>
<p><img src="/img/2016072829.png" alt=""></p>
<ol>
<li>如果在步骤2时，用户后退回到了此Activity：系统会调用onResume，此时Activity回到前台继续运行。如图：</li>
</ol>
<p><img src="/img/2016072830.png" alt=""></p>
<ol>
<li>如果在步骤3和4时，用户后退或解锁回到了此Activity：系统会调用onRestart，然后调用onStart，最后调用onResume，然后此Activity回到前台继续运行。如图：</li>
</ol>
<p><img src="/img/2016072831.png" alt=""></p>
<ol>
<li><p>当Activity处于被覆盖或后台不可见时(即步骤3和4)，系统内存不足时会杀死该Activity(系统杀死Activity时，步骤3与4的Activity的被杀优先级会比步骤2高)，这时如果用户后退回到该Activity，系统会重新执行onCreate，onStart，onResume进入运行状态。此过程不好验证，不提供图片了。</p>
</li>
<li><p>用户退出Activity时：系统会先执行onPause，然后执行onStop，最后执行onDestory方法结束此Activity的运行。如图：</p>
</li>
</ol>
<p><img src="/img/2016072832.png" alt=""></p>
<ol>
<li>系统内存不足杀死Activity结束运行时的生命周期函数执行情况我目前无法验证，暂时不是很清楚。</li>
</ol>
<p>从上面的生命周期过程来看，主要涉及到了7个生命周期函数，下面是我对于每个生命周期主要作用的理解：</p>
<ol>
<li><p><code>onCreate：</code>用于Activity的初始化，例如设置布局，初始化相关布局控件等。</p>
</li>
<li><p><code>onStart：</code>设置Activity窗口可见</p>
</li>
<li><p><code>onResume：</code>让Activity窗口处于系统前台</p>
</li>
<li><p><code>onRestart：</code>在Activity由不可见回到可见时，需要通过此方法唤起onStart的执行</p>
</li>
<li><p><code>onPause：</code>让Activity窗口退出系统前台(参照上面的过程2理解)，与onResume方法刚好是一对</p>
</li>
<li><p><code>onStop：</code>让Activity窗口不可见(参照上面的过程3和过程4理解)，与onStart方法刚好是一对</p>
</li>
<li><p><code>onDestory：</code>结束Activity，销毁相关资源</p>
</li>
</ol>
<p>光说了这些理论的东西是不够，只有亲自测试验证过了记忆才够深刻，下面是我测试验证的主要代码：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div><div class="line">88</div><div class="line">89</div><div class="line">90</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">LifeCycle_A_Activity</span> <span class="keyword">extends</span> <span class="title">Activity</span> </span>{</div><div class="line"> <span class="keyword">private</span> <span class="keyword">final</span> String TAG = getClass().getSimpleName();</div><div class="line"> <span class="keyword">private</span> Button btn1;</div><div class="line"> <span class="keyword">private</span> Button btn2;</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onCreate</span><span class="params">(Bundle savedInstanceState)</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onCreate(savedInstanceState);</div><div class="line"> setContentView(R.layout.activity_lifecycle_a_layout);</div><div class="line"> btn1 = (Button) findViewById(R.id.btn_lifecycle);</div><div class="line"> btn2 = (Button) findViewById(R.id.btn_lifecycle2);</div><div class="line"> btn1.setText(<span class="string">"跳转到LifeCycle_B_Activity(透明)"</span>);</div><div class="line"> btn2.setText(<span class="string">"跳转到LifeCycle_C_Activity(非透明)"</span>);</div><div class="line"> </div><div class="line"> btn1.setOnClickListener(<span class="keyword">new</span> OnClickListener() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onClick</span><span class="params">(View v)</span> </span>{</div><div class="line"> toAnotherActivity(LifeCycle_B_Activity.class);</div><div class="line"> }</div><div class="line"> });</div><div class="line"> btn2.setOnClickListener(<span class="keyword">new</span> OnClickListener() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onClick</span><span class="params">(View v)</span> </span>{</div><div class="line"> toAnotherActivity(LifeCycle_C_Activity.class);</div><div class="line"> }</div><div class="line"> });</div><div class="line"> </div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onCreate"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">toAnotherActivity</span><span class="params">(Class<?> claxx)</span> </span>{</div><div class="line"> startActivity(<span class="keyword">new</span> Intent(LifeCycle_A_Activity.<span class="keyword">this</span>, claxx));</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onStart</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onStart();</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onStart"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onRestart</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onRestart();</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onRestart"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onResume</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onResume();</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onResume"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onStop</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onStop();</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onStop"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onPause</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onPause();</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onPause"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onDestroy</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onDestroy();</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onDestroy"</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onSaveInstanceState</span><span class="params">(Bundle outState)</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onSaveInstanceState(outState);</div><div class="line"> outState.putInt(<span class="string">"stateParam"</span>, <span class="number">1</span>);</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onSaveInstanceState,save value is:"</span> + <span class="number">1</span>);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onRestoreInstanceState</span><span class="params">(Bundle savedInstanceState)</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onRestoreInstanceState(savedInstanceState);</div><div class="line"> <span class="keyword">int</span> value = savedInstanceState.getInt(<span class="string">"stateParam"</span>);</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onRestoreInstanceState,restore value is:"</span> + value);</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onWindowFocusChanged</span><span class="params">(<span class="keyword">boolean</span> hasFocus)</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onWindowFocusChanged(hasFocus);</div><div class="line"> Log.i(TAG, <span class="string">"LifeCycle----onWindowFocusChanged, focus is:"</span> + hasFocus);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>该Activity对应的布局文件代码如下：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div></pre></td><td class="code"><pre><div class="line"><?xml version="1.0" encoding="utf-8"?></div><div class="line"><span class="tag"><<span class="name">LinearLayout</span> <span class="attr">xmlns:android</span>=<span class="string">"http://schemas.android.com/apk/res/android"</span></span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:gravity</span>=<span class="string">"center_horizontal"</span></div><div class="line"> <span class="attr">android:orientation</span>=<span class="string">"vertical"</span> ></div><div class="line"> </div><div class="line"> <span class="tag"><<span class="name">Button</span> </span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/btn_lifecycle"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span>/></div><div class="line"> </div><div class="line"> <span class="tag"><<span class="name">Button</span> </span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/btn_lifecycle2"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span>/></div><div class="line"> </div><div class="line"><span class="tag"></<span class="name">LinearLayout</span>></span></div></pre></td></tr></table></figure></p>
<p>Activity跳转后覆盖的透明与非透明的Activity代码及布局文件如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div></pre></td><td class="code"><pre><div class="line"><span class="comment">//透明的Activity，在注册Activity时需要添加theme属性</span></div><div class="line"><span class="comment">//android:theme="@android:style/Theme.Translucent"</span></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">LifeCycle_B_Activity</span> <span class="keyword">extends</span> <span class="title">Activity</span> </span>{</div><div class="line"> <span class="keyword">private</span> Button btn;</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onCreate</span><span class="params">(Bundle savedInstanceState)</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onCreate(savedInstanceState);</div><div class="line"> setContentView(R.layout.activity_lifecycle_b_layout);</div><div class="line"> btn = (Button) findViewById(R.id.btn_lifecycle);</div><div class="line"> btn.setText(<span class="string">"当前为LifeCycle_B_Activity(透明)"</span>);</div><div class="line"> }</div><div class="line">}</div><div class="line"> </div><div class="line"><span class="comment">//非透明的Activity</span></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">LifeCycle_C_Activity</span> <span class="keyword">extends</span> <span class="title">Activity</span> </span>{</div><div class="line"> <span class="keyword">private</span> Button btn;</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onCreate</span><span class="params">(Bundle savedInstanceState)</span> </span>{</div><div class="line"> <span class="keyword">super</span>.onCreate(savedInstanceState);</div><div class="line"> setContentView(R.layout.activity_lifecycle_b_layout);</div><div class="line"> btn = (Button) findViewById(R.id.btn_lifecycle);</div><div class="line"> btn.setText(<span class="string">"当前为LifeCycle_C_Activity(非透明)"</span>);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"><?xml version="1.0" encoding="utf-8"?></div><div class="line"><span class="tag"><<span class="name">LinearLayout</span> <span class="attr">xmlns:android</span>=<span class="string">"http://schemas.android.com/apk/res/android"</span></span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:gravity</span>=<span class="string">"center"</span></div><div class="line"> <span class="attr">android:orientation</span>=<span class="string">"vertical"</span> ></div><div class="line"> </div><div class="line"> <span class="tag"><<span class="name">Button</span> </span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/btn_lifecycle"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span>/></div><div class="line"> </div><div class="line"><span class="tag"></<span class="name">LinearLayout</span>></span></div></pre></td></tr></table></figure>
<p>很明显，上面的验证代码中我多写了三个方法<code>onWindowFocusChanged</code>，<code>onSaveInstanceState</code>，<code>onRestoreInstanceState</code>，这三个方法都不属于Activity生命周期函数，只是这三个函数在Activity生命周期变化时，对于我们的应用开发还是紧密相关的，所以我给加进来一起看下他们的执行时机。</p>
<ol>
<li><p><code>onWindowFocusChanged：</code>看名字就可以知道，这个函数是Activity窗体焦点发生变化时的回调，比如Activity在前台显示，被覆盖，手机截屏，按下Home键等等，都会触发该方法。再结合我上面生命周期过程验证结果，其实更容易理解，该函数只会在Activity是否前台显示发生变化时触发，也就是在<code>onResume</code>或<code>onPause</code>调用后触发该函数。当我们想在Activity初始化时获取某个特定组件的大小时，在<code>onCreate</code>中是无法获取的，因为这个时候Window对象还没有创建完成，这个时候，我们可以通过<code>onWindowFocusChanged</code>函数来获取指定组件的大小。</p>
</li>
<li><p><code>`onSaveInstanceState：</code></p>
<ol>
<li>当系统资源不足杀死Activity时会调用该函数。</li>
<li>当屏幕方向发生变化时也会调用该函数。</li>
<li>当Activity被覆盖或锁屏或按下Home键时都会调用该函数。该方法主要用于保存当前窗体各个视图组件View的状态信息，当然我们也可以手动保存一些临时变量以避免资源不足Activity被杀死或屏幕发生变化后无法恢复到之前状态。根据上面的生命周期过程验证发现<code>onSaveInstanceState</code>是在Activity由前台显示变为不显示时触发，也就是在onPause调用后触发该函数。这个也很容易理解，当Activity由前台显示变为后台显示时，只有先将当前的窗体各个视图组件状态保存起来，系统后续恢复起来才有依据才知道恢复到什么样子。</li>
</ol>
</li>
<li><p><code>onRestoreInstanceState：</code>该函数与<code>onSaveInstanceState</code>相对的，它主要用于恢复用户保存的一些临时数据以及系统之前通过<code>onSaveInstanceState</code>保存的各个组件的状态信息。此方法目前经过验证只在屏幕方向发生变化时才会调用。系统资源不足杀死Activity后重新恢复创建Activity这种情况无法验证，这种情况是否执行待验证。</p>
</li>
</ol>
<p>屏幕方向发生变化时验证如下结果如下图(在手机设置中先设置为自动旋转屏幕，在AndroidMainfest.xml中注册Activity时不要设置android:screenOrientation属性)：</p>
<p><img src="/img/2016072833.png" alt=""></p>
<p>上面日志中清晰的记载了Activity销毁之前保存的临时变量通过<code>onRestoreInstanceState</code>可用获取得到。</p>
<p>write by laohu</p>
<p>2015年10月8日21:56:06</p>
<hr>
<p>原创文章，本文采用<a href="https://creativecommons.org/licenses/by/2.5/cn/" target="_blank" rel="external">知识共享署名 2.5(中国大陆许可协议)</a>进行许可，欢迎转载，但转载请注明来自<a href="ittiger.cn">ittiger.cn</a>，并保证转载后文章内容的完整性。本人(laohu)保留所有版权相关权利。</p>
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