55-Android之修改Toast的显示时长

平台：SRPD Android10 SC9832E

在系统中，输入法切换的提示，我使用的是Toast的来实现的。

后续客户测试反映，输入法切换的提示显示太慢，要求改进。

我因此针对输入法的Toast的显示，增加了一个Toast.LENGTH_INPUT属性。

frameworks/base/core/java/android/widget/Toast.java

@IntDef(prefix = { "LENGTH_" }, value = {
     		LENGTH_SHORT,
            LENGTH_LONG,
            LENGTH_INPUT // TODO 添加
})
@Retention(RetentionPolicy.SOURCE)
public @interface Duration {}

public static final int LENGTH_INPUT = 2;  // TODO 添加

frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java 

@GuardedBy("mToastQueue")
private void scheduleDurationReachedLocked(ToastRecord r){
    mHandler.removeCallbacksAndMessages(r);
    Message m = Message.obtain(mHandler, MESSAGE_DURATION_REACHED, r);
    // TODO 此处修改 @{
    // int delay = r.duration == Toast.LENGTH_LONG ? LONG_DELAY : SHORT_DELAY;
    int delay = r.duration == Toast.LENGTH_LONG ? LONG_DELAY : (r.duration == Toast.LENGTH_INPUT ? 800 : SHORT_DELAY);
    // @}
    // Accessibility users may need longer timeout duration. This api compares original delay
    // with user's preference and return longer one. It returns original delay if there's no
    // preference.
    delay = mAccessibilityManager.getRecommendedTimeoutMillis(delay,
            AccessibilityManager.FLAG_CONTENT_TEXT);
    mHandler.sendMessageDelayed(m, delay);
}

如果需要修改Toast的Toast.LENGTH_SHORT和Toast. LENGTH_LONG的默认时长，请修改NotificationManagerService中LONG_DELAY和SHORT_DELAY常量的值：

frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java 

static final int LONG_DELAY = PhoneWindowManager.TOAST_WINDOW_TIMEOUT;
static final int SHORT_DELAY = 2000; // 2 seconds，TODO 修改该值


frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

public static final int TOAST_WINDOW_TIMEOUT = 3500; // 3.5 seconds， TODO 修改该值