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53 lines
1.3 KiB
53 lines
1.3 KiB
6 years ago
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View 工作原理
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#### 目录
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1. 思维导图
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2. 概述
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3.
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4. 参考
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#### 思维导图
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#### 概述
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1. 初始化 PhoneWindow 和 WindowManager
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2.
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#### 步骤一：初始化 PhoneWindow 和 WindowManager
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在 Activity 的 onCreate、onStart、onResume 等生命周期被调用之前，attach 方法将先会被调用，因此将 attach 方法作为这篇文章主线的开头：
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```java
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// Activity#attach()：
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final void attach(...) {
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attachBaseContext(context);
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//初始化 PhoneWindow
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mWindow = new PhoneWindow(this, window, activityConfigCallback);
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//初始化 WindowManager
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mWindow.setWindowManager(
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(WindowManager)context.getSystemService(Context.WINDOW_SERVICE),
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mToken, mComponent.flattenToString(),
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(info.flags & ActivityInfo.FLAG_HARDWARE_ACCELERATED) != 0);
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mWindowManager = mWindow.getWindowManager();
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}
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// Window#setWindowManager()：
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public void setWindowManager(WindowManager wm, IBinder appToken, String appName,
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boolean hardwareAccelerated) {
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//...
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if (wm == null) {
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wm = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
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}
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mWindowManager = ((WindowManagerImpl)wm).createLocalWindowManager(this);
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}
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```
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#### 参考
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