Merge pull request #62 from onlylemi/patch-2

see 10/15 log

utilcode/src/main/java/com/blankj/utilcode/utils/AppUtils.java

@@ -427,17 +427,33 @@ public class AppUtils {
      * @return {@code true}: 是<br>{@code false}: 否
      */
     public static boolean isAppForeground(Context context) {
-        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
-        List<ActivityManager.RunningAppProcessInfo> processInfos = am.getRunningAppProcesses();
-        if (processInfos != null) {
-            for (ActivityManager.RunningAppProcessInfo processInfo : processInfos) {
-                if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND
-                        && Arrays.asList(processInfo.pkgList).contains(context.getPackageName())) {
-                    return true;
-                }
-            }
-        }
-        return false;
+        return ProcessUtils.isAppForeground(context);
+    }
+
+    /**
+     * 判断某个App是否处于前台（系统应用调用）
+     * <p>API < 21，需要添加 {@code <uses-permission android:name="android.permission.GET_TASKS"/>} 权限</p>
+     * <p>API >= 22，需要添加　{@code <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>} 权限</p>
+     *
+     * @param context     上下文
+     * @param packageName 包名
+     * @return {@code true}: 是<br>{@code false}: 否
+     */
+    @Deprecated
+    public static boolean isAppForeground(Context context, String packageName) {
+        return ProcessUtils.isAppForeground(context, packageName);;
+    }
+    
+    /**
+     * 获取前台应用包名（系统应用调用）
+     * <p>API < 21，需要添加 {@code <uses-permission android:name="android.permission.GET_TASKS"/>} 权限</p>
+     * <p>API >= 22，需要添加　{@code <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>} 权限</p>
+     *
+     * @param context 上下文
+     * @return 前台应用包名
+     */
+    public String getForegroundApp(Context context) {
+        return ProcessUtils.getForegroundPackage(context);
     }
 
     /**

utilcode/src/main/java/com/blankj/utilcode/utils/ProcessUtils.java

+package com.blankj.utilcode.utils;
+
+import android.annotation.TargetApi;
+import android.app.ActivityManager;
+import android.app.usage.UsageEvents;
+import android.app.usage.UsageStats;
+import android.app.usage.UsageStatsManager;
+import android.content.Context;
+import android.os.Build;
+import android.text.TextUtils;
+
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * <pre>
+ *     author: onlylemi
+ *     blog  : https://github.com/onlylemi
+ *     time  : 2016/10/14
+ *     desc  : 前台进程信息获取相关
+ * </pre>
+ */
+public class ProcessUtils {
+
+    private static UsageStats recentStats;
+    private static String result;
+
+    private ProcessUtils() {
+    }
+
+    /**
+     * 判断应用是否处于前台
+     *
+     * @param context
+     * @return
+     */
+    public static boolean isAppForeground(Context context) {
+        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        List<ActivityManager.RunningAppProcessInfo> runningAppProcessInfos = manager.getRunningAppProcesses();
+        if (runningAppProcessInfos == null || runningAppProcessInfos.size() == 0) {
+            return false;
+        }
+        for (ActivityManager.RunningAppProcessInfo ra : runningAppProcessInfos) {
+            if (ra.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND
+                    && Arrays.asList(ra.pkgList).contains(context.getPackageName())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * 判断某个应用是否处于前台（系统应用调用）
+     * <p>API < 21，需要添加 {@code <uses-permission android:name="android.permission.GET_TASKS"/>} 权限</p>
+     * <p>API >= 22，需要添加　{@code <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>} 权限</p>
+     *
+     * @param context
+     * @param packageName
+     * @return
+     */
+    public static boolean isAppForeground(Context context, String packageName) {
+        return TextUtils.equals(packageName, getForegroundPackage(context));
+    }
+
+    /**
+     * 获取前台应用包名（系统应用调用）
+     * <p>API < 21，需要添加 {@code <uses-permission android:name="android.permission.GET_TASKS"/>} 权限</p>
+     * <p>API >= 22，需要添加　{@code <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>} 权限</p>
+     *
+     * @param context
+     * @return
+     */
+    public static String getForegroundPackage(Context context) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            return getForegroundPackage1(context);
+        } else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP_MR1) {
+            return getForegroundPackage2(context);
+        } else {
+            return getForegroundPackage3(context);
+        }
+    }
+
+
+    /**
+     * 获取前台应用包名（API < 21，已被遗弃，不能使用）
+     * <p>需要添加　{@code <uses-permission android:name="android.permission.GET_TASKS"/>} 权限</p>
+     *
+     * @param context
+     * @return
+     */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    private static String getForegroundPackage1(Context context) {
+        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
+        if (runningTaskInfos == null || runningTaskInfos.size() == 0
+                || runningTaskInfos.get(0) == null) {
+            return null;
+        }
+
+        return runningTaskInfos.get(0).topActivity.getPackageName();
+    }
+
+    /**
+     * 获取前台应用包名（在 API 22 开始仅可以获取自己的应用，其他应用位于前台时获取到为 null，但可以通过此方式判断自己的应用是否处于前台）
+     *
+     * @param context
+     * @return
+     */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1)
+    private static String getForegroundPackage2(Context context) {
+        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        List<ActivityManager.RunningAppProcessInfo> runningAppProcessInfos = manager.getRunningAppProcesses();
+        if (runningAppProcessInfos == null || runningAppProcessInfos.size() == 0) {
+            return null;
+        }
+        for (ActivityManager.RunningAppProcessInfo ra : runningAppProcessInfos) {
+            if (ra.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
+                return ra.processName;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 获取前台应用包名（API >= 22）
+     * <p>需要添加　{@code <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>} 权限</p>
+     *
+     * @param context
+     * @return
+     */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1)
+    public static String getForegroundPackage3(Context context) {
+        UsageStatsManager usageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
+
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(new Date());
+        long endTime = calendar.getTimeInMillis();// 结束时间
+        calendar.add(Calendar.DAY_OF_MONTH, -1);// 时间间隔为一个月
+        long beginTime = calendar.getTimeInMillis();// 开始时间
+        // 获取一个月内的信息
+        List<UsageStats> usageStatses = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_MONTHLY, beginTime, endTime);
+        if (usageStatses == null || usageStatses.size() == 0) {
+            return null;
+        }
+        for (UsageStats usageStats : usageStatses) {
+            if (recentStats == null || usageStats.getLastTimeUsed() > recentStats.getLastTimeUsed()) {
+                recentStats = usageStats;
+            }
+        }
+
+        return recentStats.getPackageName();
+    }
+
+    /**
+     * 获取前台应用包名（API >= 22）
+     * <p>需要添加　{@code <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>} 权限</p>
+     *
+     * @param context
+     * @return
+     */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1)
+    private static String getForegroundPackage4(Context context) {
+        UsageStatsManager usageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
+
+        long endTime = System.currentTimeMillis();
+        long beginTime = endTime - 10 * 1000;
+        UsageEvents.Event event = new UsageEvents.Event();
+        UsageEvents usageEvents = usageStatsManager.queryEvents(beginTime, endTime);
+        while (usageEvents.hasNextEvent()) {
+            usageEvents.getNextEvent(event);
+            if (event.getEventType() == UsageEvents.Event.MOVE_TO_FOREGROUND) {
+                result = event.getPackageName();
+            }
+        }
+
+        return result;
+    }
+}
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