* A progress bar can also be made indeterminate. In indeterminate mode, the - * progress bar shows a cyclic animation. This mode is used by applications - * when the length of the task is unknown. + * progress bar shows a cyclic animation without an indication of progress. This mode is used by + * applications when the length of the task is unknown. The indeterminate progress bar can be either + * a spinning wheel or a horizontal bar. *
* *The following code example shows how a progress bar can be used from * a worker thread to update the user interface to notify the user of progress: *
* - *
+ *
* public class MyActivity extends Activity {
* private static final int PROGRESS = 0x1;
*
@@ -91,7 +92,7 @@ import com.android.internal.R;
* // Start lengthy operation in a background thread
* new Thread(new Runnable() {
* public void run() {
- * while (mProgressStatus < 100) {
+ * while (mProgressStatus < 100) {
* mProgressStatus = doWork();
*
* // Update the progress bar
@@ -104,8 +105,61 @@ import com.android.internal.R;
* }
* }).start();
* }
- * }
- *
+ * }
+ *
+ * To add a progress bar to a layout file, you can use the {@code <ProgressBar>} element. + * By default, the progress bar is a spinning wheel (an indeterminate indicator). To change to a + * horizontal progress bar, apply the {@link android.R.style#Widget_ProgressBar_Horizontal + * Widget.ProgressBar.Horizontal} style, like so:
+ * + *+ * <ProgressBar + * style="@android:style/Widget.ProgressBar.Horizontal" + * ... />+ * + *
If you will use the progress bar to show real progress, you must use the horizontal bar. You + * can then increment the progress with {@link #incrementProgressBy incrementProgressBy()} or + * {@link #setProgress setProgress()}. By default, the progress bar is full when it reaches 100. If + * necessary, you can adjust the maximum value (the value for a full bar) using the {@link + * android.R.styleable#ProgressBar_max android:max} attribute. Other attributes available are listed + * below.
+ * + *Another common style to apply to the progress bar is {@link + * android.R.style#Widget_ProgressBar_Small Widget.ProgressBar.Small}, which shows a smaller + * version of the spinning wheel—useful when waiting for content to load. + * For example, you can insert this kind of progress bar into your default layout for + * a view that will be populated by some content fetched from the Internet—the spinning wheel + * appears immediately and when your application receives the content, it replaces the progress bar + * with the loaded content. For example:
+ * + *+ * <LinearLayout + * android:orientation="horizontal" + * ... > + * <ProgressBar + * android:layout_width="wrap_content" + * android:layout_height="wrap_content" + * style="@android:style/Widget.ProgressBar.Small" + * android:layout_marginRight="5dp" /> + * <TextView + * android:layout_width="wrap_content" + * android:layout_height="wrap_content" + * android:text="@string/loading" /> + * </LinearLayout>+ * + *
Other progress bar styles provided by the system include:
+ *The "inverse" styles provide an inverse color scheme for the spinner, which may be necessary + * if your application uses a light colored theme (a white background).
* *XML attributes *
@@ -113,13 +167,21 @@ import com.android.internal.R; * {@link android.R.styleable#View View Attributes} *
* - *Styles - *
- * @attr ref android.R.styleable#Theme_progressBarStyle - * @attr ref android.R.styleable#Theme_progressBarStyleSmall - * @attr ref android.R.styleable#Theme_progressBarStyleLarge - * @attr ref android.R.styleable#Theme_progressBarStyleHorizontal - *
+ * @attr ref android.R.styleable#ProgressBar_animationResolution + * @attr ref android.R.styleable#ProgressBar_indeterminate + * @attr ref android.R.styleable#ProgressBar_indeterminateBehavior + * @attr ref android.R.styleable#ProgressBar_indeterminateDrawable + * @attr ref android.R.styleable#ProgressBar_indeterminateDuration + * @attr ref android.R.styleable#ProgressBar_indeterminateOnly + * @attr ref android.R.styleable#ProgressBar_interpolator + * @attr ref android.R.styleable#ProgressBar_max + * @attr ref android.R.styleable#ProgressBar_maxHeight + * @attr ref android.R.styleable#ProgressBar_maxWidth + * @attr ref android.R.styleable#ProgressBar_minHeight + * @attr ref android.R.styleable#ProgressBar_minWidth + * @attr ref android.R.styleable#ProgressBar_progress + * @attr ref android.R.styleable#ProgressBar_progressDrawable + * @attr ref android.R.styleable#ProgressBar_secondaryProgress */ @RemoteView public class ProgressBar extends View {