java - 关于Android App Lock服务的问题

Question

我在 App Locker 工作。我已经制作了可以检查锁定的应用程序并显示“锁定应用程序屏幕”的服务，以便用户可以输入密码。当锁定应用程序打开时，我的代码直到这个阶段都工作正常。

我需要停止我的服务，因为我的服务正在持续运行？当用户已经输入正确的凭据时，它会一次又一次地显示我的登录 Activity 。我怎样才能阻止这个问题？代码:服务:

public class ProcessService extends Service {

private Set<String> mLockedApps = new HashSet<String>();
private long lastModified = 0;
private BroadcastReceiver mScreenStateReceiver;
private File mLockedAppsFile;
ArrayList<String> packagezList;
SharedPreferences sharedPrefs;
Map<String, ?> allEntries;
SharedPreferences sharedPrefsapp;
Object obj;
private String prefix;
private Handler handler;
private DbAccess dbAccess;
@Override
public IBinder onBind(Intent arg0) {
    return null;
}


@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    startService(new Intent(this, ProcessService.class));
     dbAccess=new DbAccess(this);

    if (TIMER == null) {

        TIMER = new Timer(true);
        TIMER.scheduleAtFixedRate(new LockAppsTimerTask(), 3000, 750);
        mScreenStateReceiver = new BroadcastReceiver() {

            private boolean screenOff;

            @Override
            public void onReceive(Context context, Intent intent) {



                if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                    screenOff = true;
                } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                    screenOff = false;
                }

                if (screenOff) {
                    //Log.i(TAG, "Cancel Timer");
                    TIMER.cancel();
                } else {
                    // Log.i(TAG, "Restart Timer");
                    TIMER = new Timer(true);
                    TIMER.scheduleAtFixedRate(new LockAppsTimerTask(), 1000, 250);
                }
            }
        };

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
            registerReceiver(mScreenStateReceiver, filter);

    }
    // this.stopSelf();
    //startforeground goes here
    return START_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
    startService(new Intent(this, ProcessService.class));
}

private class LockAppsTimerTask extends TimerTask {

    @Override
    public void run() {


        sharedPrefs = getApplicationContext().getSharedPreferences(getApplicationContext().getPackageName(), Context.MODE_PRIVATE);
        sharedPrefsapp = getApplicationContext().getSharedPreferences("appdb", Context.MODE_PRIVATE);
        allEntries= null;
        allEntries = sharedPrefsapp.getAll();

        //prefix = "m";
        packagezList= null;
        packagezList = new ArrayList<String>();
        for (Map.Entry<String, ?> entry : allEntries.entrySet()) {

            Log.e("right key: ", entry.getKey().toString() + "right value: " + entry.getValue().toString());


            packagezList.add(entry.getKey());
        }

        for(Object object: packagezList){
            Log.e("Object!", (String) object);
        //    Log.e("Package",""+packagezList.get(0));
        }


        ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);

        try {
            //List<RecentTaskInfo> recentTasks = activityManager.getRecentTasks(1, ActivityManager.RECENT_IGNORE_UNAVAILABLE);
            ActivityManager mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
            List<ActivityManager.RunningTaskInfo> RunningTask = mActivityManager
                    .getRunningTasks(1);
            ActivityManager.RunningTaskInfo ar = RunningTask.get(0);
            String activityOnTop = ar.topActivity.getPackageName();

            Log.e("activity on Top", "" + activityOnTop);
            Log.e(" My package name", "" + getApplicationContext().getPackageName());
            //for (Object data : newArrayList) {

            for(Object object: packagezList){
                Log.e("My Object!", (String)object);



                if(activityOnTop.equals("com.android.settings"))
                {  // you have to make this check even better
                    Intent i = new Intent(getApplicationContext(), MainActivity.class);
                    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NO_USER_ACTION);
                    i.putExtra("callFromService",true);
                    i.putExtra("ApppakageName", "com.android.settings" );
                    startActivity(i);
                }

            }
        } catch (Exception e) {
            Log.e("Foreground App", e.getMessage(), e);
        }
    }



}

}

锁屏 Activity :

public class SeconActivity extends Activity {

    public static final String TAG = "AppLock-Abhishek";
    private String oldPasscode = null;
    protected EditText codeField1 = null;
    protected EditText codeField2 = null;
    protected EditText codeField3 = null;
    protected EditText codeField4 = null;
    protected TextView tvMessage = null;
    protected InputFilter[] filters = null;
    private String str1,str2,str3,str4;
    private ProgressDialog dialog;
    Map<String, ?> allEntries;
    SharedPreferences sharedPrefsapp;
    ArrayList<String> packagezList;
    private DbAccess dbAccess;
    private ActionBar actionBar;

    private int type=0;
    private String confirmPass=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        dbAccess=new DbAccess(this);
        dialog=new ProgressDialog(this);
        setContentView(R.layout.page_passcode);
        Cursor c;
        c=dbAccess.getType();
        if(c.moveToNext())
        type=c.getInt(c.getColumnIndex("type"));
        Cursor cursor;
        cursor=dbAccess.getPasssword();
        if (cursor.moveToNext()) {
            confirmPass = cursor.getString(cursor.getColumnIndex("password"));
        }
            tvMessage = (TextView) findViewById(R.id.tv_message);
        tvMessage.setText(R.string.reenter_passcode);
        //editcodeFields
        filters = new InputFilter[2];
        filters[0] = new InputFilter.LengthFilter(1);
        filters[1] = numberFilter;

        codeField1 = (EditText) findViewById(R.id.passcode_1);
        setupEditText(codeField1);

        codeField2 = (EditText) findViewById(R.id.passcode_2);
        setupEditText(codeField2);

        codeField3 = (EditText) findViewById(R.id.passcode_3);
        setupEditText(codeField3);

        codeField4 = (EditText) findViewById(R.id.passcode_4);
        setupEditText(codeField4);

        // setup the keyboard
        ((Button) findViewById(R.id.button0)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button1)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button2)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button3)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button4)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button5)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button6)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button7)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button8)).setOnClickListener(btnListener);
        ((Button) findViewById(R.id.button9)).setOnClickListener(btnListener);

        ((Button) findViewById(R.id.button_clear))
                .setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        clearFields();
                    }
                });

        ((Button) findViewById(R.id.button_erase))
                .setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        onDeleteKey();
                    }
                });
    }


    private InputFilter numberFilter = new InputFilter() {
        @Override
        public CharSequence filter(CharSequence source, int start, int end,
                                   Spanned dest, int dstart, int dend) {

            if (source.length() > 1) {
                return "";
            }

            if (source.length() == 0) // erase
            {
                return null;
            }

            try {
                int number = Integer.parseInt(source.toString());
                if ((number >= 0) && (number <= 9))
                    return String.valueOf(number);
                else
                    return "";
            } catch (NumberFormatException e) {
                return "";
            }
        }
    };

    protected  void reEnterePass()

    {
        codeField1.setText("");
        codeField2.setText("");
        codeField3.setText("");
        codeField4.setText("");
        codeField1.requestFocus();


        // set the value and move the focus
    }

    protected void onPasscodeError() {
        Toast toast = Toast.makeText(this, getString(R.string.passcode_wrong),
                Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 30);
        toast.show();

        Thread thread = new Thread() {
            public void run() {
                Animation animation = AnimationUtils.loadAnimation(
                        SeconActivity.this, R.anim.shake);
                findViewById(R.id.ll_applock).startAnimation(animation);
                codeField1.setText("");
                codeField2.setText("");
                codeField3.setText("");
                codeField4.setText("");
                codeField1.requestFocus();
            }
        };
        runOnUiThread(thread);
    }
    protected void setupEditText(EditText editText) {
        editText.setInputType(InputType.TYPE_NULL);
        editText.setFilters(filters);
        editText.setOnTouchListener(touchListener);
        editText.setTransformationMethod(PasswordTransformationMethod
                .getInstance());
    }


    private View.OnTouchListener touchListener = new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            v.performClick();
            clearFields();
            return false;
        }
    };

    private void clearFields() {
        codeField1.setText("");
        codeField2.setText("");
        codeField3.setText("");
        codeField4.setText("");
        codeField1.postDelayed(new Runnable() {

            @Override
            public void run() {
                codeField1.requestFocus();
            }
        }, 200);
    }

    private View.OnClickListener btnListener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            int currentValue = -1;
            int id = view.getId();
            if (id == R.id.button0) {
                currentValue = 0;
            } else if (id == R.id.button1) {
                currentValue = 1;
            } else if (id == R.id.button2) {
                currentValue = 2;
            } else if (id == R.id.button3) {
                currentValue = 3;
            } else if (id == R.id.button4) {
                currentValue = 4;
            } else if (id == R.id.button5) {
                currentValue = 5;
            } else if (id == R.id.button6) {
                currentValue = 6;
            } else if (id == R.id.button7) {
                currentValue = 7;
            } else if (id == R.id.button8) {
                currentValue = 8;
            } else if (id == R.id.button9) {
                currentValue = 9;
            } else {
            }

            // set the value and move the focus
            String currentValueString = String.valueOf(currentValue);
            if (codeField1.isFocused()) {
                codeField1.setText(currentValueString);
                str1=currentValueString;
                codeField2.requestFocus();
                codeField2.setText("");

            } else if (codeField2.isFocused()) {
                codeField2.setText(currentValueString);
                str2=currentValueString;
                codeField3.requestFocus();
                codeField3.setText("");
            } else if (codeField3.isFocused()) {
                codeField3.setText(currentValueString);
                str3=currentValueString;
                codeField4.requestFocus();
                codeField4.setText("");

            } else if (codeField4.isFocused()) {
                codeField4.setText(currentValueString);
                str4=currentValueString;
            }
            if (codeField4.getText().toString().length() > 0
                    && codeField3.getText().toString().length() > 0
                    && codeField2.getText().toString().length() > 0
                    && codeField1.getText().toString().length() > 0) {
                Log.e(TAG, str1 + str2 + str3 + str4);
                String passCode=(str1+str2+str3+str4).trim();
                switch (type){

                    case 1:
                            if (passCode.equals(confirmPass)){
                                startActivity(new Intent(getApplicationContext(),LockScreenActivity.class));
                            }else
                            {
                                onPasscodeError();
                            }


                        break;
                    case 2:

                        if(passCode.equalsIgnoreCase(confirmPass)){

                            finish();

                        }else
                        {
                            Intent startHomescreen=new Intent(Intent.ACTION_MAIN);
                            startHomescreen.addCategory(Intent.CATEGORY_HOME);
                            startHomescreen.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                            startActivity(startHomescreen);
                        }
                        break;
                    default:
                        break;
                }
            }
        }
    };

    private void onDeleteKey() {
        if (codeField1.isFocused()) {

        } else if (codeField2.isFocused()) {
            codeField1.requestFocus();
            codeField1.setText("");
        } else if (codeField3.isFocused()) {
            codeField2.requestFocus();
            codeField2.setText("");
        } else if (codeField4.isFocused()) {
            codeField3.requestFocus();
            codeField3.setText("");
        }
    }
}//end of class

Answer 1

首先我想告诉你，你不应该依赖定时器来让你的代码重复运行，因为定时器在一段时间后会被系统销毁，我希望你已经意识到这个错误。对于您的问题，您应该创建一个 HashMap 来通过验证密码来了解用户是否已经访问了前台 Activity 。