implement AlarmManager and JobScheduler

This is needed for the bootstrap job when setting up WhatsApp in
companion device mode.

The implementation is based on `Handler.postDelayed()`, so jobs and
alarms are not persistent for now.

src/api-impl/android/app/ActivityManager.java

@@ -1,12 +1,14 @@
 package android.app;
 
+import android.content.Context;
 import android.content.pm.ConfigurationInfo;
 import android.graphics.Bitmap;
-import android.os.IBinder;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.os.Process;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Collections;
 
@@ -14,6 +16,13 @@ public class ActivityManager {
 
 	public static class RunningAppProcessInfo{
 		public int importance;
+		public int pid;
+		public String processName;
+
+		private RunningAppProcessInfo(int pid, String processName) {
+			this.pid = pid;
+			this.processName = processName;
+		} 
 	}
 
 	public static class TaskDescription {
@@ -21,7 +30,7 @@ public class ActivityManager {
 	}
 
 	public List<RunningAppProcessInfo> getRunningAppProcesses() {
-		return null;
+		return Arrays.asList(new RunningAppProcessInfo(Process.myPid(), Context.this_application.getPackageName()));
 	}
 
 	public boolean isLowRamDevice() {return false;}

src/api-impl/android/app/AlarmManager.java

@@ -1,13 +1,51 @@
 package android.app;
 
+import android.os.Handler;
+import android.os.Looper;
+import android.os.SystemClock;
+import android.text.format.DateUtils;
+import android.util.Slog;
+
 public class AlarmManager {
-	public void cancel(PendingIntent operation) {}
+	private static final String TAG = "AlarmManager";
 
-	public void setInexactRepeating(int type, long triggerTime, long interval, PendingIntent operation) {}
-
-	public void setExact(int type, long triggerTime, PendingIntent operation) {}
-
-	public void set(int type, long triggerTime, PendingIntent operation) {}
-
-	public void setExactAndAllowWhileIdle(int type, long triggerAtMillis, PendingIntent operation) {}
+	public void cancel(PendingIntent operation) {
+		Slog.i(TAG, "cancel(" + operation + ") called");
+	}
+
+	public void setInexactRepeating(int type, long triggerTime, long interval, PendingIntent operation) {
+		Slog.i(TAG, "setInexactRepeating(" + type + ", " + triggerTime + ", " + interval + ", " + operation + ") called");
+		long delay = triggerTime - ((type == 2 || type == 3) ? SystemClock.elapsedRealtime() : System.currentTimeMillis());
+		Slog.i(TAG, "setInexactRepeating() delay: " + DateUtils.formatElapsedTime(delay) + " interval: " + DateUtils.formatElapsedTime(interval));
+		Handler handler = new Handler(Looper.getMainLooper());
+		handler.postDelayed(new Runnable() {
+			@Override
+			public void run() {
+				Slog.i(TAG, "delivering repeating alarm: " + operation);
+				operation.send();
+				handler.postDelayed(this, interval);
+			}
+		}, delay);
+	}
+
+	public void setExact(int type, long triggerTime, PendingIntent operation) {
+		Slog.i(TAG, "setExact(" + type + ", " + triggerTime + ", " + operation + ") called");
+		long delay = triggerTime - ((type == 2 || type == 3) ? SystemClock.elapsedRealtime() : System.currentTimeMillis());
+		Slog.i(TAG, "setExact() delay: " + DateUtils.formatElapsedTime(delay));
+		new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
+			@Override
+			public void run() {
+				Slog.i(TAG, "delivering alarm: " + operation);
+				operation.send();
+			}
+		}, delay);
+	}
+
+	public void set(int type, long triggerTime, PendingIntent operation) {
+		setExact(type, triggerTime, operation);
+	}
+
+	public void setExactAndAllowWhileIdle(int type, long triggerAtMillis, PendingIntent operation) {
+		setExact(type, triggerAtMillis, operation);
+	}
 }

src/api-impl/android/app/job/JobInfo.java

@@ -5,20 +5,63 @@ import android.os.PersistableBundle;
 
 public class JobInfo {
 
+	private ComponentName service;
+	long initialBackoffMillis;
+	int backoffPolicy;
+	private PersistableBundle extras;
+	long periodicMillis;
+	private int id;
+	boolean running;
+	long minLatencyMillis;
+
 	public JobInfo() {}
 
+	public ComponentName getService() {
+		return service;
+	}
+
+	public PersistableBundle getExtras() {
+		return extras;
+	}
+
+	public int getId() {
+		return id;
+	}
+
+	public String toString() {
+		return "JobInfo{"
+				+ "jobService=" + service
+				+ ", initialBackoffMillis=" + initialBackoffMillis
+				+ ", backoffPolicy=" + backoffPolicy
+				+ ", extras=" + extras
+				+ ", periodicMillis=" + periodicMillis
+				+ ", id=" + id
+				+ '}';
+	}
+
 	public static final class Builder {
-		public Builder(int jobId, ComponentName jobService) {}
+
+		private JobInfo jobInfo;
+
+		public Builder(int jobId, ComponentName jobService) {
+			jobInfo = new JobInfo();
+			jobInfo.id = jobId;
+			jobInfo.service = jobService;
+		}
 
 		public Builder setBackoffCriteria(long initialBackoffMillis, int backoffPolicy) {
+			jobInfo.initialBackoffMillis = initialBackoffMillis;
+			jobInfo.backoffPolicy = backoffPolicy;
 			return this;
 		}
 
 		public Builder setExtras(PersistableBundle extras) {
+			jobInfo.extras = extras;
 			return this;
 		}
 
 		public Builder setMinimumLatency(long minLatencyMillis) {
+			jobInfo.minLatencyMillis = minLatencyMillis;
 			return this;
 		}
 
@@ -27,6 +70,7 @@ public class JobInfo {
 		}
 
 		public Builder setPeriodic(long dummy) {
+			jobInfo.periodicMillis = dummy;
 			return this;
 		}
 
@@ -55,7 +99,7 @@ public class JobInfo {
 		}
 
 		public JobInfo build() {
-			return new JobInfo();
+			return jobInfo;
 		}
 	}
 }

src/api-impl/android/app/job/JobParameters.java

@@ -0,0 +1,16 @@
+package android.app.job;
+
+import android.os.PersistableBundle;
+
+public class JobParameters {
+
+	JobInfo jobInfo;
+
+	JobParameters(JobInfo jobInfo) {
+		this.jobInfo = jobInfo;
+	}
+
+	public PersistableBundle getExtras() {
+		return jobInfo.getExtras();
+	}
+}

src/api-impl/android/app/job/JobScheduler.java

@@ -1,9 +1,21 @@
 package android.app.job;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Slog;
 
 public class JobScheduler {
+	private static final String TAG = "JobScheduler";
+
+	static Map<Integer,JobInfo> pendingJobs = new HashMap<>();
+	private static Map<Class<? extends JobService>, JobService> runningServices = new HashMap<>();
+
 	/**
 	 * Retrieve all jobs that have been scheduled by the calling application.
 	 *
@@ -11,7 +23,7 @@ public class JobScheduler {
 	 *     currently started as well as those that are still waiting to run.
 	 */
 	public List<JobInfo> getAllPendingJobs() {
-		return new ArrayList<JobInfo>();
+		return new ArrayList<>(pendingJobs.values());
 	};
 
 	public int enqueue(JobInfo job, JobWorkItem work) {
@@ -19,9 +31,47 @@ public class JobScheduler {
 	}
 
 	public int schedule(JobInfo job) {
+		Slog.i(TAG, "JobScheduler.schedule() called with job: " + job);
+		if (pendingJobs.containsKey(job.getId()))
+			return 1; //RESULT_SUCCESS
+		pendingJobs.put(job.getId(), job);
+		new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					String className = job.getService().getClassName();
+					Class <? extends JobService> cls = Class.forName(className).asSubclass(JobService.class);
+					if (!runningServices.containsKey(cls)) {
+						JobService service = cls.getConstructor().newInstance();
+						service.attachBaseContext(new Context());
+						service.onCreate();
+						runningServices.put(cls, service);
+					}
+					job.running = true;
+					boolean result = runningServices.get(cls).onStartJob(new JobParameters(job));
+					Slog.i(TAG, "onStartJob() returned " + result);
+				} catch (ReflectiveOperationException e) {
+					e.printStackTrace();
+				}
+			}
+		}, job.minLatencyMillis);
 		return 1; //RESULT_SUCCESS
 	}
 
-	public void cancel(int dummy) {
+	public void cancel(int id) {
+		JobInfo job = pendingJobs.remove(id);
+		if (job != null && job.running) {
+			new Handler(Looper.getMainLooper()).post(new Runnable() {
+				@Override
+				public void run() {
+					JobService service = runningServices.get(job.getService().getClass());
+					if (service != null) {
+						JobParameters params = new JobParameters(job);
+						service.onStopJob(params);
+						job.running = false;
+					}
+				}
+			});
+		}
 	}
 }

src/api-impl/android/app/job/JobService.java

@@ -1,4 +1,31 @@
 package android.app.job;
 
-public class JobService {
+import android.app.Service;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Slog;
+
+public abstract class JobService extends Service {
+	private static final String TAG = "JobService";
+
+	public abstract boolean onStartJob(JobParameters params);
+
+	public abstract boolean onStopJob(JobParameters params);
+
+	public void jobFinished(JobParameters params, boolean needsReschedule) {
+		Slog.i(TAG, "jobFinished(" + params + ", " + needsReschedule + ") called");
+		params.jobInfo.running = false;
+		if (needsReschedule || params.jobInfo.periodicMillis != 0) {
+			new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
+				@Override
+				public void run() {
+					params.jobInfo.running = true;
+					boolean result = onStartJob(params);
+					Slog.i(TAG, "onStartJob() returned " + result);
+				}
+			}, needsReschedule ? params.jobInfo.initialBackoffMillis : params.jobInfo.periodicMillis);
+		} else {
+			JobScheduler.pendingJobs.remove(params.jobInfo.getId());
+		}
+	}
 }

src/api-impl/android/content/Intent.java

@@ -26,6 +26,7 @@ public class Intent implements Parcelable {
 	private int flags;
 	private String type;
 	private String packageName;
+	private Intent selector;
 
 	public Intent() {}
 	public Intent(Intent o) {
@@ -402,11 +403,17 @@ public class Intent implements Parcelable {
 		return null;
 	}
 
-	public void setSelector(Intent selector) {}
+	public void setSelector(Intent selector) {
+		this.selector = selector;
+	}
 
 	public void setClipData(ClipData clip) {}
 
 	public String resolveType(Context context) {
 		return type;
 	}
+
+	public Intent getSelector() {
+		return selector;
+	}
 }

src/api-impl/android/os/PersistableBundle.java

@@ -1,4 +1,9 @@
 package android.os;
 
 public class PersistableBundle extends BaseBundle {
+
+	@Override
+	public synchronized String toString() {
+		return "PersistableBundle[" + mMap.toString() + "]";
+	}
 }

src/api-impl/android/security/keystore/AndroidKeyStore.java

@@ -94,13 +94,13 @@ public class AndroidKeyStore extends KeyStoreSpi {
 	@Override
 	public boolean engineIsKeyEntry(String alias) {
 		// TODO Auto-generated method stub
-		throw new UnsupportedOperationException("Unimplemented method 'engineIsKeyEntry'");
+		return map.containsKey(alias);
 	}
 
 	@Override
 	public boolean engineIsCertificateEntry(String alias) {
 		// TODO Auto-generated method stub
-		throw new UnsupportedOperationException("Unimplemented method 'engineIsCertificateEntry'");
+		return false;
 	}
 
 	@Override

src/api-impl/android/view/View.java

@@ -2221,4 +2221,6 @@ public class View implements Drawable.Callback {
 	public WindowInsets computeSystemWindowInsets(WindowInsets insets, Rect contentInsets) { return insets; }
 
 	public boolean isDuplicateParentStateEnabled() { return false; }
+
+	public void setBackgroundTintMode(PorterDuff.Mode tintMode) {}
 }

src/api-impl/android/widget/TimePicker.java

@@ -0,0 +1,17 @@
+package android.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+
+public class TimePicker extends View {
+
+	public TimePicker(Context context) {
+		super(context);
+	}
+
+	public TimePicker(Context context, AttributeSet attributeSet) {
+		super(context, attributeSet);
+	}
+
+}

src/api-impl/meson.build

@@ -64,6 +64,7 @@ srcs = [
 	'android/app/backup/BackupAgentHelper.java',
 	'android/app/backup/BackupManager.java',
 	'android/app/job/JobInfo.java',
+	'android/app/job/JobParameters.java',
 	'android/app/job/JobScheduler.java',
 	'android/app/job/JobService.java',
 	'android/app/job/JobWorkItem.java',
@@ -644,6 +645,7 @@ srcs = [
 	'android/widget/TableRow.java',
 	'android/widget/TextSwitcher.java',
 	'android/widget/TextView.java',
+	'android/widget/TimePicker.java',
 	'android/widget/Toast.java',
 	'android/widget/ToggleButton.java',
 	'android/widget/Toolbar.java',