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11在Application里初始化
this.mRefWatcher = BuildConfig.DEBUG ? LeakCanary.install(this) : RefWatcher.DISABLED;
fragment的onDestroy
public void onDestroy() {
super.onDestroy();
RefWatcher refWatcher = App.getMyApplicationContext().getRefWatcher();
refWatcher.watch(this);
}
简述：install的时候为application注册Application.ActivityLifecycleCallbacks，然后在onActivityDestroyed为当前activity添加弱引用，手动触发gc，收集日志然后报警与否。