ProgressBar under Action Bar

Question Summary: How can I make a ProgressBar integrated inside the ActionBar, like on the Chrome App?

Details: Look at this screenshot from Chrome:

Chrome for Android screenshot

I want to create an Action Bar just like this. Just under the Action Bar, there's a ProgressBar that fills according to page load. I've seen this example from many apps, like Feedly, but I haven't been able to create my own implementation. I tried using Android's own APIs to create it:

@Override
protected void onCreate(Bundle savedInstanceState) {
//Request Permission to display the Progress Bar...
this.requestWindowFeature(Window.FEATURE_PROGRESS);
this.setWindowContentView(R.layout.activity_main)
super.onCreate(savedInstanceState);


this.setProgressBarIndeterminate(true);
}

But this code only causes the ProgressBar to show over the Action Bar, like so:

My App Screenshot

So, how can I make my ProgressBar appear under the Action Bar, like on the Chrome App?

40751 次浏览
小开

Extend Activities from following class to have a ProgressBar at the top(below ActionBar) of each, and a getProgressBar() method:

Parent class:

public abstract class ProgressActivity extends Activity {
private ProgressBar mProgressBar;


@Override
public void setContentView(View view) {
init().addView(view);
}


@Override
public void setContentView(int layoutResID) {
getLayoutInflater().inflate(layoutResID,init(),true);
}


@Override
public void setContentView(View view, ViewGroup.LayoutParams params) {
init().addView(view,params);
}


private ViewGroup init(){
super.setContentView(R.layout.progress);
mProgressBar = (ProgressBar) findViewById(R.id.activity_bar);
return (ViewGroup) findViewById(R.id.activity_frame);
}


protected ProgressBar getProgressBar(){
return mProgressBar;
}
}

Layout (progress.xml):

<?xml version="1.0" encoding="utf-8"?>


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical"
android:layout_width="match_parent" android:layout_height="match_parent">
<ProgressBar android:id="@+id/activity_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="-8dp"
style="@android:style/Widget.DeviceDefault.ProgressBar.Horizontal"
/>
<FrameLayout android:id="@+id/activity_frame"
android:layout_width="match_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
小开

Well , I did something similar for one of my pet apps and am not sure if that's the only way or the best way to do it , but it definitely works.

To begin with , use an overlay action bar and then set the background drawable to "null" so that the overlay action bar is transparent.

Now in you activity layout , set the top margin for your root view to "actionbar height" You can do it like this.

<RelativeLayout
...
android:layout_marginTop="?android:attr/actionBarSize" />

Now the action is not going to hide any of your activity content.

The next thing you have to do now is - add a header view on top of your root view with height same as the action bar. Set a background color to it. This would now be the color of your action bar and since the action bar aligns perfectly on top pf this header view.

Now you can easily put a progress bar in the header view and align it to the bottom of the header view. To the user this would look as if the progress bar is on the action bar itself , just like chrome ..

小开

Please use below code. just use one default style in progress bar as style="?android:attr/progressBarStyleHorizontal"

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<ProgressBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:indeterminate="true"


/>


</RelativeLayout>
小开

I wasn't fully satisfied with the accepted answer above, so I did some extra research myself.

The trick I believe they used is that they retrieved the top view in the view hierarchy called DecorView and added the progress bar in there. That way, the progress bar displays both over the action bar AND the content area. Note that the S.D.'s answer puts the progress bar into content area and 'steals' space from actual content, what can lead to unexpected results.

Sample screenshots of this implementation:

ProgressBar

ProgressBarIndeterminate

Code

Just put this code into onCreate method of some activity and it should work:

// create new ProgressBar and style it
final ProgressBar progressBar = new ProgressBar(this, null, android.R.attr.progressBarStyleHorizontal);
progressBar.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 24));
progressBar.setProgress(65);


// retrieve the top view of our application
final FrameLayout decorView = (FrameLayout) getWindow().getDecorView();
decorView.addView(progressBar);


// Here we try to position the ProgressBar to the correct position by looking
// at the position where content area starts. But during creating time, sizes
// of the components are not set yet, so we have to wait until the components
// has been laid out
// Also note that doing progressBar.setY(136) will not work, because of different
// screen densities and different sizes of actionBar
ViewTreeObserver observer = progressBar.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
View contentView = decorView.findViewById(android.R.id.content);
progressBar.setY(contentView.getY() - 10);


ViewTreeObserver observer = progressBar.getViewTreeObserver();
observer.removeOnGlobalLayoutListener(this);
}
});

You can play with LayoutParams' height argument to set the progressBar wider or narrower, but you might have to adjust the -10 offset.

Styling

Unfortunately, you can see the ugly gray background of the progress bar. To remove it, simply searching for the background by id and trying to hide it doesn't work. To remove the background, I had to create identical drawble of the system version and remove the background item.

TL;DR: Create file progress_horizontal_holo_no_background_light.xml and paste this drawable:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">


<item android:id="@android:id/secondaryProgress">
<scale android:scaleWidth="100%"
android:drawable="@drawable/progress_secondary_holo_light" />
</item>


<item android:id="@android:id/progress">
<scale android:scaleWidth="100%"
android:drawable="@drawable/progress_primary_holo_light" />
</item>


</layer-list>

Copy appropriate .png drawables from sdk/platforms/android-xx/data/res/drawable-xxx/ to your project and then in the code you can add:

progressBar.setProgressDrawable(getResources().getDrawable(R.drawable.progress_horizontal_holo_no_background_light));

Extra: Indeterminate Progress Bar

Pre-KitKat versions of indeterminate progress bars are pretty ugly and laggy. You can download new smooth progressBar called ButteryProgressBar. Just search for it on google (I cannot post any more links, because I am new here :[ ), add the class into your project and you can simply replace the previous ProgressBar with this code and have crispy indeterminate progress bar:

final ButteryProgressBar progressBar = new ButteryProgressBar(this);
progressBar.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 24));

You might also need to simplify this code:

final TypedArray ta = c.obtainStyledAttributes(attrs, R.styleable.ButteryProgressBar);
try {
mBarColor = ta.getColor(R.styleable.ButteryProgressBar_barColor,
c.getResources().getColor(android.R.color.holo_blue_light));
mSolidBarHeight = ta.getDimensionPixelSize(
R.styleable.ButteryProgressBar_barHeight,
Math.round(DEFAULT_BAR_HEIGHT_DP * mDensity));
mSolidBarDetentWidth = ta.getDimensionPixelSize(
R.styleable.ButteryProgressBar_detentWidth,
Math.round(DEFAULT_DETENT_WIDTH_DP * mDensity));
} finally {
ta.recycle();
}

to this code:

mBarColor = c.getResources().getColor(android.R.color.holo_blue_light);
mSolidBarHeight = Math.round(DEFAULT_BAR_HEIGHT_DP * mDensity);
mSolidBarDetentWidth = Math.round(DEFAULT_DETENT_WIDTH_DP * mDensity);

Hope I helped :)

小开

I have compiled code from this thread as well as other threads on StackOverflow and created a project that can be used to implement ButteryProgessbar as well as "pull down to refresh". https://github.com/pauldmps/Gmail-like-Pull-Down-to-Refresh

Feel free to use the code in your application.

A big thanks to you guys.

小开
最佳答案

This is now a native behavior that can be obtained using SwipeRefreshLayout.

You can wrap your scrollable view with a SwipeRefreshLayout and then you just need to listen to onRefresh events:

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
swipeLayout.setOnRefreshListener(this);
swipeLayout.setColorScheme(android.R.color.holo_blue_bright,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
}




@Override public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override public void run() {
swipeLayout.setRefreshing(false);
}
}, 5000);
}

A nice and simple tutorial can be found in this blog.


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