通过文件锁来检测app是否在运行

app/src/main/java/com/xypower/mpapp/MicroPhotoService.java

@@ -65,8 +65,11 @@ import com.xypower.mpapp.v2.Camera2VideoActivity;
 import com.xypower.mpapp.video.RawActivity;
 
 import java.io.File;
+import java.io.FileOutputStream;
+import java.io.RandomAccessFile;
 import java.lang.reflect.Method;
 import java.net.InetAddress;
+import java.nio.channels.FileLock;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashMap;
@@ -147,6 +150,9 @@ public class MicroPhotoService extends Service {
 
     public static boolean isRunning = false;
 
+    FileOutputStream mAppRunningFile;
+    FileLock mAppLock;
+
     private Runnable delayedSleep = new Runnable() {
         @Override
         public void run() {
@@ -202,6 +208,30 @@ public class MicroPhotoService extends Service {
     public void onCreate() {
         super.onCreate();
 
+        try {
+            final String appPath = MicroPhotoContext.buildMpAppDir(this);
+            File lockerFile = new File(appPath);
+            lockerFile = new File(lockerFile, "data/alive/running");
+            mAppRunningFile = new FileOutputStream(lockerFile);
+
+            for (int idx = 0; idx < 3; idx++) {
+                try {
+                    mAppLock = mAppRunningFile.getChannel().tryLock();
+                    if (mAppLock != null && mAppLock.isValid()) {
+                        break;
+                    }
+                    try {
+                        Thread.sleep(16);
+                    } catch (Exception ex) {
+                    }
+                } catch (Exception ex) {
+                    ex.printStackTrace();
+                }
+            }
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+
         mHander = new ServiceHandler();
 
         mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
@@ -272,6 +302,18 @@ public class MicroPhotoService extends Service {
     @Override
     public void onDestroy() {
 
+        try {
+
+            if (mAppLock != null) {
+                mAppLock.close();
+            }
+            if (mAppRunningFile != null) {
+                mAppRunningFile.close();
+            }
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+
         mStateService = STATE_SERVICE.NOT_CONNECTED;
 
         Log.w(TAG, "MicroPhotoService::onDestroy called");

mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java

@@ -45,11 +45,14 @@ import org.json.JSONObject;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.InputStream;
+import java.io.RandomAccessFile;
 import java.lang.reflect.Method;
+import java.nio.channels.FileLock;
 import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
+import java.util.concurrent.ExecutionException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -387,6 +390,51 @@ public class MpMasterService extends Service {
             final Context context = getApplicationContext();
             long ts = System.currentTimeMillis();
 
+            FileOutputStream runningFile = null;
+            FileLock fileLock = null;
+            try {
+                boolean isMpAppRunning = true;
+                String mpappDir = MicroPhotoContext.buildMpAppDir(getApplicationContext());
+                File file = new File(mpappDir);
+                file = new File(file, "data/alive/running");
+                if (file.exists()) {
+                    runningFile = new FileOutputStream(file);
+                    fileLock = runningFile.getChannel().tryLock();
+                    if (fileLock != null && fileLock.isValid()) {
+                        isMpAppRunning = false;
+                    }
+                    try {
+                        if (fileLock != null) {
+                            fileLock.close();
+                            fileLock = null;
+                        }
+                    } catch (Exception ex) {
+                        ex.printStackTrace();
+                    }
+                    FilesUtils.closeFriendly(runningFile);
+                } else {
+                    isMpAppRunning = false;
+                }
+
+                if (!isMpAppRunning) {
+                    // Restart MpApp
+                    MicroPhotoContext.restartMpApp(context, "MpMST Keep Alive Detection: NO Lock");
+                    logger.warning("Restart MpAPP as There is NO Lock");
+                    return;
+                }
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            } finally {
+                try {
+                    if (fileLock != null) {
+                        fileLock.close();
+                    }
+                } catch (Exception ex) {
+                    ex.printStackTrace();
+                }
+                FilesUtils.closeFriendly(runningFile);
+            }
+
             if (mPreviousMpHbTime <= ts && ts - mPreviousMpHbTime > mMpHeartbeatDuration * 2) {
                 // MpApp is not running
                 if (ts - mTimeToStartMpApp >= 30000) {