Android编程权威指南（第19章 Android辅助功能）

19.1

1.在真机上开启talkBack服务（虚拟机没有）

19.2.1

1.添加内容描述字符串（res/values/string.xml)

  <string name="crime_photo_button_description">Take photo of crime scene</string>
    <string name="crime_photo_no_image_description">Crime scene photo (not set)</string>
    <string name="crime_photo_image_description">Crime scene photo (set)</string>

2.为ImageButton和ImageView添加内容描述（res/layout/fragment_crime.xml)

android:contentDescription="@string/crime_photo_no_image_description"

android:contentDescription="@string/crime_photo_button_description" />

19.2.2

1.让ImageView可聚焦（res/layout/fragment_crime.xml)

android:focusable="true" />

19.3

1.动态设置内容描述（CrimeFragment.java)

 mPhotoView.setContentDescription(
                    getString(R.string.crime_photo_no_image_description));

   mPhotoView.setContentDescription(
                    getString(R.string.crime_photo_image_description));

2.给EdiText打标签（res/layout/fragment_crime.xml)

 android:labelFor="@+id/crime_title" />