Android控件TextView的实现原理分析
作者：网络转载 发布时间：[ 2013/5/16 10:28:29 ] 推荐标签：
Step 5. ViewRoot.deliverKeyEventToViewHierarchy
[java] view plaincopyprint?
public final class ViewRoot extends Handler implements ViewParent，
View.AttachInfo.Callbacks {
......
private void deliverKeyEventToViewHierarchy(KeyEvent event， boolean sendDone) {
try {
if (mView != null && mAdded) {
final int action = event.getAction();
boolean isDown = (action == KeyEvent.ACTION_DOWN);
......
boolean keyHandled = mView.dispatchKeyEvent(event);
if (!keyHandled && isDown) {
int direction = 0;
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_DPAD_LEFT:
direction = View.FOCUS_LEFT;
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
direction = View.FOCUS_RIGHT;
break;
case KeyEvent.KEYCODE_DPAD_UP:
direction = View.FOCUS_UP;
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
direction = View.FOCUS_DOWN;
break;
}
if (direction != 0) {
View focused = mView != null ? mView.findFocus() : null;
if (focused != null) {
View v = focused.focusSearch(direction);
......
if (v != null && v != focused) {
......
focusPassed = v.requestFocus(direction， mTempRect);
}
......
}
}
}
}
} finally {
if (sendDone) {
finishInputEvent();
}
......
}
}
......
}
public final class ViewRoot extends Handler implements ViewParent，
View.AttachInfo.Callbacks {
......
private void deliverKeyEventToViewHierarchy(KeyEvent event， boolean sendDone) {
try {
if (mView != null && mAdded) {
final int action = event.getAction();
boolean isDown = (action == KeyEvent.ACTION_DOWN);
......
boolean keyHandled = mView.dispatchKeyEvent(event);
if (!keyHandled && isDown) {
int direction = 0;
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_DPAD_LEFT:
direction = View.FOCUS_LEFT;
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
direction = View.FOCUS_RIGHT;
break;
case KeyEvent.KEYCODE_DPAD_UP:
direction = View.FOCUS_UP;
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
direction = View.FOCUS_DOWN;
break;
}
if (direction != 0) {
View focused = mView != null ? mView.findFocus() : null;
if (focused != null) {
View v = focused.focusSearch(direction);
......
if (v != null && v != focused) {
......
focusPassed = v.requestFocus(direction， mTempRect);
}
......
}
}
}
}
} finally {
if (sendDone) {
finishInputEvent();
}
......
}
}
......
}
这个函数定义在文件frameworks/base/core/java/android/view/ViewRoot.java中。
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