android 抽屉关闭时的卡顿

摘要: android drawer close avoid stuttering

1.from https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html

DrawerLayout.DrawerListener

can be used to monitor the state and motion of drawer views. Avoid performing expensive operations such as layout during animation as it can cause stuttering; try to perform expensive operations during the

STATE_IDLE

state.

DrawerLayout.SimpleDrawerListener

offers default/no-op implementations of each callback method.

2.具体实现
http://stackoverflow.com/questions/18343018/optimizing-drawer-and-activity-launching-speed
Avoid performing expensive operations such as layout during animation as it can cause stuttering; try to perform expensive operations during the STATE_IDLE state.

Instead of using a

Handler

and hard-coding the time delay, you can override the

onDrawerStateChanged

method of

ActionBarDrawerToggle

(which implements

DrawerLayout.DrawerListener

), so that you can perform the expensive operations when the drawer is fully closed.

Inside MainActivity,

private class SmoothActionBarDrawerToggle extends ActionBarDrawerToggle {

private Runnable runnable;

public SmoothActionBarDrawerToggle(Activity activity, DrawerLayout drawerLayout, Toolbar toolbar, int openDrawerContentDescRes, int closeDrawerContentDescRes) {
super(activity, drawerLayout, toolbar, openDrawerContentDescRes, closeDrawerContentDescRes);
}

@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
invalidateOptionsMenu();
}
@Override
public void onDrawerStateChanged(int newState) {
super.onDrawerStateChanged(newState);
if (runnable != null && newState == DrawerLayout.STATE_IDLE) {
runnable.run();
runnable = null;
}
}

public void runWhenIdle(Runnable runnable) {
this.runnable = runnable;
}
}

Set the

DrawerListener

in

onCreate

:

mDrawerToggle = new SmoothActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open, R.string.close);
mDrawerLayout.setDrawerListener(mDrawerToggle);

Finally,

private void selectItem(int position) {
switch (position) {
case DRAWER_ITEM_SETTINGS: {
mDrawerToggle.runWhenIdle(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
startActivity(intent);
}
});
mDrawerLayout.closeDrawers();
break;
}
case DRAWER_ITEM_HELP: {
mDrawerToggle.runWhenIdle(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(MainActivity.this, HelpActivity.class);
startActivity(intent);
}
});
mDrawerLayout.closeDrawers();
break;
}
}
}