深入理解WMS（一）：Window的创建过程

private Activity performLaunchActivity(ActivityClientRecord r, Intent customIntent) {

. . .

Activity activity = null;

try {

java.lang.ClassLoader cl = r.packageInfo.getClassLoader();

// 通过类加载器创建 Activity 的实例对象

activity = mInstrumentation.newActivity(cl, component.getClassName(), r.intent);

. . .

} catch (Exception e) { . . . }

try {

. . .

if (activity != null) {

Context appContext = createBaseContextForActivity(r, activity);

CharSequence title = r.activityInfo.loadLabel(appContext.getPackageManager());

Configuration config = new Configuration(mCompatConfiguration);

if (DEBUG_CONFIGURATION) Slog.v(TAG, ". . . ");

// 调用其 attach 方法为其关联运行过程中所依赖的一系列上下文环境变量

activity.attach(appContext, this, getInstrumentation(), r.token,

r.ident, app, r.intent, r.activityInfo, title, r.parent,