我目前正在更新面向片段的应用程序(我有一个Activity,其FrameLayout容器作为我所有片段的主机)到Material Design.我想在更换片段时将汉堡图标设置为后箭头的动画.
基本上,如果这还不够清楚,here就是我想要实现的目标.我不想使用this library (MaterialMenu),我想使用官方的AppCompat lib来扩展可能.
由于this solution,我实现了这个效果,但是当更换片段时,我无法弄清楚如何将ActionBarDrawerToggle作为后退按钮.
所以我的问题是：如果后箭头图标仍然是ActionBarDrawerToggleonce,Fragement已被替换？在这种情况下,我如何覆盖它,以便它像onBackPressed(),而不是打开抽屉？我已经尝试了这个,但它不起作用：
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case android.R.id.home:
getActivity().onBackPressed();
return true;
}
return false;
}
提前致谢.
解决方法
如果你手动打开它,我认为在抽屉里面跟踪更清洁.这就是我最终做的事情：
public class ManualActionBarDrawerToggle extends ActionBarDrawerToggle {
private static final float MENU_POSITION = 0f;
private static final float ARROW_POSITION = 1.0f;
private final int animationLength;
private final DrawerLayout drawerLayout;
private final Activity activity;
private State currentState;
private enum State { UP_ARROW,MENU }
public ManualActionBarDrawerToggle(Activity activity,DrawerLayout drawerLayout,int openDrawerContentDescriptionResource,int closeDrawerContentDescriptionResource) {
super(activity,drawerLayout,openDrawerContentDescriptionResource,closeDrawerContentDescriptionResource);
animationLength = activity.getResources().getInteger(android.R.integer.config_shortAnimTime);
this.drawerLayout = drawerLayout;
this.activity = activity;
currentState = State.MENU;
}
public void animateToBackArrow() {
ValueAnimator anim = ValueAnimator.ofFloat(MENU_POSITION,ARROW_POSITION);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float slideOffset = (Float) valueAnimator.getAnimatedValue();
onDrawerSlide(drawerLayout,slideOffset);
}
});
anim.setInterpolator(new DecelerateInterpolator());
anim.setDuration(animationLength);
anim.start();
currentState = State.UP_ARROW;
}
public void animateToMenu() {
ValueAnimator anim = ValueAnimator.ofFloat(ARROW_POSITION,MENU_POSITION);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float slideOffset = (Float) valueAnimator.getAnimatedValue();
onDrawerSlide(drawerLayout,slideOffset);
}
});
anim.setInterpolator(new DecelerateInterpolator());
anim.setDuration(animationLength);
anim.start();
currentState = State.MENU;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case (android.R.id.home):
if (currentState == State.UP_ARROW) {
activity.onBackPressed();
return true;
}
}
return super.onOptionsItemSelected(item);
}
}
