/** 实现放大缩小控件隐藏 */
public static void setZoomControlGone(WebView view) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // 用于判断是否为Android 3.0系统, 然后隐藏缩放控件
view.getSettings().setDisplayZoomControls(false);
} else {
// Android 3.0(11) 以下使用以下方法:
// 利用java的反射机制
Class classType;
Field field;
try {
classType = WebView.class;
field = classType.getDeclaredField("mZoomButtonsController");
field.setAccessible(true);
ZoomButtonsController mZoomButtonsController = new ZoomButtonsController(view);
mZoomButtonsController.getZoomControls().setVisibility(View.GONE);
try {
field.set(view, mZoomButtonsController);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
}
}
void updateZoomControls() {
if (mZoomButtonsController == null) return;
boolean canZoomIn = mContentViewCore.canZoomIn();
boolean canZoomOut = mContentViewCore.canZoomOut();
if (!canZoomIn && !canZoomOut) {
// Hide the zoom in and out buttons if the page cannot zoom
mZoomButtonsController.getZoomControls().setVisibility(View.GONE);
} else {
// Set each one individually, as a page may be able to zoom in or out
mZoomButtonsController.setZoomInEnabled(canZoomIn);
mZoomButtonsController.setZoomOutEnabled(canZoomOut);
}
}
private ZoomButtonsController getControls() {
if (mZoomButtonsController == null) {
mZoomButtonsController = new ZoomButtonsController(mWebView.getWebView());
mZoomButtonsController.setOnZoomListener(new ZoomListener());
// ZoomButtonsController positions the buttons at the bottom, but in
// the middle. Change their layout parameters so they appear on the
// right.
View controls = mZoomButtonsController.getZoomControls();
ViewGroup.LayoutParams params = controls.getLayoutParams();
if (params instanceof FrameLayout.LayoutParams) {
((FrameLayout.LayoutParams) params).gravity = Gravity.RIGHT;
}
}
return mZoomButtonsController;
}
public void setZoomControlGone(View view) {
Class classType;
Field field;
try {
classType = WebView.class;
field = classType.getDeclaredField("mZoomButtonsController");
field.setAccessible(true);
ZoomButtonsController mZoomButtonsController = new ZoomButtonsController(view);
mZoomButtonsController.getZoomControls().setVisibility(View.GONE);
try {
field.set(view, mZoomButtonsController);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
}
// This method is used in tests. It doesn't modify the state of zoom controls.
View getZoomControlsViewForTest() {
return mZoomButtonsController != null ? mZoomButtonsController.getZoomControls() : null;
}
