attrs.xml
文件中声明属性名
比如Theme范围内定义的属性toastFrameBackground(Toast的背景)
<declare-styleable name="Theme">
<!-- Background to use for toasts -->
<attr name="toastFrameBackground" format="reference" />
</declare-styleable>
theme.xml
<style name="Theme">
<!-- Toast attributes -->
<item name="toastFrameBackground">@drawable/toast_frame</item>
在这里定义了该属性的值
</style>
<!-- Theme for a window that looks like a toast. -->
<style name="Theme.Toast" parent="Theme.DeviceDefault.Dialog">
在这里使用了该定义的值
<item name="windowBackground">?attr/toastFrameBackground</item>
<item name="windowAnimationStyle">@style/Animation.Toast</item>
<item name="backgroundDimEnabled">false</item>
<item name="windowCloseOnTouchOutside">false</item>
<item name="windowContentTransitions">false</item>
<item name="windowActivityTransitions">false</item>
</style>
Toast
// 说明我们默认的Toast并没有直接使用这个"Theme.Toast",而是代码中动态设置一些属性,效果是一样的
TN() {
// XXX This should be changed to use a Dialog, with a Theme.Toast
// defined that sets up the layout params appropriately.
final WindowManager.LayoutParams params = mParams;
params.height = WindowManager.LayoutParams.WRAP_CONTENT;
params.width = WindowManager.LayoutParams.WRAP_CONTENT;
params.format = PixelFormat.TRANSLUCENT;
params.windowAnimations = com.android.internal.R.style.Animation_Toast;
params.type = WindowManager.LayoutParams.TYPE_TOAST;
params.setTitle("Toast");
params.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
}
实际中Toast用到的是在他的布局中用到的
transient_notification.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="?android:attr/toastFrameBackground">
<TextView
android:id="@android:id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_horizontal"
android:textAppearance="@style/TextAppearance.Toast"
android:textColor="@color/bright_foreground_dark"
android:shadowColor="#BB000000"
android:shadowRadius="2.75"
/>
</LinearLayout>
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