ActivityManager exposes launch count API.

import android.os.Handler;

import android.os.Parcel;

import android.os.Parcelable;

import android.os.ServiceManager;

import android.os.SystemProperties;

import android.text.TextUtils;

import android.util.DisplayMetrics;

import android.util.Log;

import com.android.internal.app.IUsageStats;

import com.android.internal.os.PkgUsageStats;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

 * Interact with the overall activities running in the system.

    public static boolean isRunningInTestHarness() {

        return SystemProperties.getBoolean("ro.test_harness", false);

    }

    /**

     * Returns the launch count of each installed package.

     *

     * @hide

     */

    public Map<String, Integer> getAllPackageLaunchCounts() {

        try {

            IUsageStats usageStatsService = IUsageStats.Stub.asInterface(

                    ServiceManager.getService("usagestats"));

            if (usageStatsService == null) {

                return new HashMap<String, Integer>();

            }

            Map<String, Integer> launchCounts = new HashMap<String, Integer>();

            for (PkgUsageStats pkgUsageStats : usageStatsService.getAllPkgUsageStats()) {

                launchCounts.put(pkgUsageStats.packageName, pkgUsageStats.launchCount);

            }

            return launchCounts;

        } catch (RemoteException e) {

            Log.w(TAG, "Could not query launch counts", e);

            return new HashMap<String, Integer>();

        }

    }

}

    <permission android:name="android.permission.PACKAGE_USAGE_STATS"

        android:label="@string/permlab_pkgUsageStats"

        android:description="@string/permdesc_pkgUsageStats"

        android:protectionLevel="signature" />

        android:protectionLevel="signatureOrSystem" />

    <!-- Allows an application to collect battery statistics -->

    <permission android:name="android.permission.BATTERY_STATS"