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凌雪
2018-10-24
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摘要：本文将带你了解Android应用开发之Android四大组件之组件Activity解析，希望本文对大家学Android有所帮助。
本文将带你了解Android应用开发之Android四大组件之组件Activity解析，希望本文对大家学Android有所帮助。
一、Activity之间通信——Intent、Bundle意图传递
Intent intent = new Intent（A.this,B.class）；intent.putExtra(kay,value);startActivity(intent);
Intent intent = new Intent(A.this,B.class);Bundle bundle = new Bundle();bundle.putString(key,value);input.putExtras(bundle);startActivity(intent);
1、回传数据?startActivityForResult（intent，requestCode）
两个页面之间传递，如 A页面 输入 2+3 ，B页面计算结果，并返回
private void toActivity_B(){ Intent intent = new Intent(Activity_A.this,Activity_B.class); intent.putExtra("a","2"); intent.putExtra("b","3"); startActivityForResult(intent,10086); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==10086 && resultCode == RESULT_OK) { int sum = data.getIntExtra("sum", 0); } }
B页面
private void sum() { Intent intent =getIntent(); int a =intent.getIntExtra("a",2); int b =intent.getIntExtra("b",3); Intent sum = new Intent(); sum.putExtra("sum",(a+b)); setResult(RESULT_OK,sum); }
2、两个Activity 之间跳转时必然会执行的是哪几个方法
Acitivity_A启动
05-09 22:15:40.777 839-839/? E/Activity_A: ------------->onCreate()05-09 22:15:40.777 839-839/? E/Activity_A: ------------->onStart()05-09 22:15:40.777 839-839/? E/Activity_A: ------------->onResume()
跳转到Activity_B
05-09 22:21:09.787 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onPause()05-09 22:21:09.807 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onCreate()05-09 22:21:09.807 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStart()05-09 22:21:09.807 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onResume()05-09 22:21:10.217 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onStop()
返回Acitivity_A
09 22:22:15.877 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onPause()05-09 22:22:15.887 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onRestart()05-09 22:22:15.887 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onStart()05-09 22:22:15.887 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onResume()05-09 22:22:16.177 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStop()05-09 22:22:16.177 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onDestroy()
那么问题来了，是不是跳转到Activity_B时，Acitivity_A都会调onStop()呢？
（1）、透明背景Activity_B
android:theme="@android:style/Theme.Translucent"
android:theme="@android:style/Theme.Translucent.NoTitleBar"
-09 22:29:50.587 7669-7669/com.apacherio.jondy.workdemo E/Activity_A: ------------->onPause()05-09 22:29:50.607 7669-7669/com.apacherio.jondy.workdemo E/Activity_B: ------------->onCreate()05-09 22:29:50.607 7669-7669/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStart()05-09 22:29:50.617 7669-7669/com.apacherio.jondy.workdemo E/Activity_B: ------------->onResume()
（2）、对话框Dialog形式Activity_B
android:theme="@android:style/Theme.Dialog"
05-09 22:33:20.297 9139-9139/com.apacherio.jondy.workdemo E/Ac<p>一、Activity之间通信——Intent、Bundle意图传递</p><pre class="brush:java;">Intent intent = new Intent（A.this,B.class）；intent.putExtra(kay,value);startActivity(intent);</pre><pre class="brush:java;">Intent intent = new Intent(A.this,B.class);Bundle bundle = new Bundle();bundle.putString(key,value);input.putExtras(bundle);startActivity(intent);</pre><p>1、回传数据?startActivityForResult（intent，requestCode）</p><p>两个页面之间传递，如 A页面 输入 2+3 ，B页面计算结果，并返回</p><pre class="brush:java;">private void toActivity_B(){ Intent intent = new Intent(Activity_A.this,Activity_B.class); intent.putExtra("a","2"); intent.putExtra("b","3"); startActivityForResult(intent,10086); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==10086 && resultCode == RESULT_OK) { int sum = data.getIntExtra("sum", 0); } }</pre><p>B页面</p><pre class="brush:java;">private void sum() { Intent intent =getIntent(); int a =intent.getIntExtra("a",2); int b =intent.getIntExtra("b",3); Intent sum = new Intent(); sum.putExtra("sum",(a+b)); setResult(RESULT_OK,sum); }</pre><p>2、两个Activity 之间跳转时必然会执行的是哪几个方法</p><p>Acitivity_A启动</p><pre class="brush:java;">05-09 22:15:40.777 839-839/? E/Activity_A: ------------->onCreate()05-09 22:15:40.777 839-839/? E/Activity_A: ------------->onStart()05-09 22:15:40.777 839-839/? E/Activity_A: ------------->onResume()</pre><p>跳转到Activity_B</p><pre class="brush:java;">05-09 22:21:09.787 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onPause()05-09 22:21:09.807 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onCreate()05-09 22:21:09.807 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStart()05-09 22:21:09.807 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onResume()05-09 22:21:10.217 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onStop()</pre><p>返回Acitivity_A</p><pre class="brush:java;">05-09 22:22:15.877 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onPause()05-09 22:22:15.887 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onRestart()05-09 22:22:15.887 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onStart()05-09 22:22:15.887 3883-3883/com.apacherio.jondy.workdemo E/Activity_A: ------------->onResume()05-09 22:22:16.177 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStop()05-09 22:22:16.177 3883-3883/com.apacherio.jondy.workdemo E/Activity_B: ------------->onDestroy()</pre><p><strong>那么问题来了，是不是跳转到Activity_B时，Acitivity_A都会调onStop()呢？</strong></p><p>（1）、透明背景Activity_B</p> <pre class="brush:java;"></pre><pre class="brush:java;">android:theme="@android:style/Theme.Translucent"</pre><pre class="brush:java;">或者</pre><pre class="brush:java;">android:theme="@android:style/Theme.Translucent.NoTitleBar"</pre> <pre class="brush:java;">05-09 22:29:50.587 7669-7669/com.apacherio.jondy.workdemo E/Activity_A: ------------->onPause()05-09 22:29:50.607 7669-7669/com.apacherio.jondy.workdemo E/Activity_B: ------------->onCreate()05-09 22:29:50.607 7669-7669/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStart()05-09 22:29:50.617 7669-7669/com.apacherio.jondy.workdemo E/Activity_B: ------------->onResume()</pre><br><p>（2）、对话框Dialog形式Activity_B</p><pre class="brush:java;">android:theme="@android:style/Theme.Dialog"</pre><pre class="brush:java;">05-09 22:33:20.297 9139-9139/com.apacherio.jondy.workdemo E/Activity_A: ------------->onPause()05-09 22:33:20.317 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onCreate()05-09 22:33:20.327 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStart()05-09 22:33:20.327 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onResume()</pre><p>上述结果的原因是：只有在不可见时，才会调用onStop(),借个图说明下</p><p><img style="height: 560px; width: 437.627px;" alt="\" src="https://www.2cto.com/uploadfile/Collfiles/20180510/20180510092616711.png"></p> <p>三、在对话框Dialog形式Activity_B时，按Home键后，生命周期是什么样的呢？</p><pre class="brush:java;">05-09 22:52:10.597 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onPause()05-09 22:52:10.597 9139-9139/com.apacherio.jondy.workdemo E/Activity_A: ------------->onStop()05-09 22:52:10.617 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStop()</pre>tivity_A: ------------->onPause()05-09 22:33:20.317 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onCreate()05-09 22:33:20.327 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStart()05-09 22:33:20.327 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onResume()
上述结果的原因是：只有在不可见时，才会调用onStop(),借个图说明下
三、在对话框Dialog形式Activity_B时，按Home键后，生命周期是什么样的呢？
05-09 22:52:10.597 9139-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onPause()05-09 22:52:10.597 9139-9139/com.apacherio.jondy.workdemo E/Activity_A: ------------->onStop()05-09 22:52:10.617 9-9139/com.apacherio.jondy.workdemo E/Activity_B: ------------->onStop()
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