Android Studio 内存泄漏活动未在线程中完成答案

【问题标题】：Android studio memory leak activity does not finish in a threadAndroid Studio 内存泄漏活动未在线程中完成
【发布时间】：2017-08-08 18:28:11
【问题描述】：

我的活动似乎没有正确完成，因为每次启动和关闭它时都会消耗更多的内存。有人可以建议我一个想法吗？这是代码：

new Thread(new Runnable() {
        @Override
        public void run() {
            Looper.prepare();
            ProgressDialog mProgressDialog = new ProgressDialog(thisActivity);
            mProgressDialog.setTitle("Getting location");
            mProgressDialog.setMessage("Please wait while the device is being located.");
            mProgressDialog.show();
            long startTime = SystemClock.currentThreadTimeMillis();
            long time = SystemClock.currentThreadTimeMillis();
            while (mLastLocation == null)
            {
                if(SystemClock.currentThreadTimeMillis() - startTime >= 5000){
                    mLastLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                }
                if(SystemClock.currentThreadTimeMillis() - time >= 1000) {
                    if (ActivityCompat.checkSelfPermission(thisActivity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(thisActivity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        return;
                    }
                    mLocationManager.requestSingleUpdate(LocationManager.GPS_PROVIDER, mLocationListener, null);
                    time = SystemClock.currentThreadTimeMillis();
                }
            }

            String date = new SimpleDateFormat("dd/MM/yyyy").format(new Date());

            ServiceModel model = new ServiceModel(0, Globals.LoggedUser.Id, ScheduleAdapter.currentToilet.Id, edt_note.getText().toString(), photo, null, reason, date, mLastLocation.getLatitude(), mLastLocation.getLongitude());
            Globals.DomainServiceManager.ServiceRepository.Create(model);
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    photo = null;
                    imv_camera.setImageBitmap(null);
                    ActivityScheduleList.setToolbarPosition(0, DATA_NOT_CAPTURED);
                }
            });
            mProgressDialog.dismiss();
            ActivityNotServeced.this.finish();
        }
    }).start();

【问题讨论】：

看来这个线程正在处理 UI 元素。你不应该这样做

标签： android multithreading android-activity memory-leaks

【解决方案1】：

Android Studio 首先有一个built in support in finding a memory leak。另一种选择是使用Leak Canary。现在，在您的代码中，我看到：mLocationManager。我怀疑这会导致泄漏。您可以使用我之前提到的方法进行验证。构建它时，不要传递活动上下文 - 使用 mActivity.getApplicationContext()。

【讨论】：

【解决方案2】：

在少数情况下您的 ProgressDialog 永远不会被取消，例如

 while (mLastLocation == null)
        {
            if(SystemClock.currentThreadTimeMillis() - startTime >= 5000){
                mLastLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            }
            if(SystemClock.currentThreadTimeMillis() - time >= 1000) {
                if (ActivityCompat.checkSelfPermission(thisActivity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(thisActivity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                mLocationManager.requestSingleUpdate(LocationManager.GPS_PROVIDER, mLocationListener, null);
                time = SystemClock.currentThreadTimeMillis();
            }
        }

您的线程永远无法完成，但它拥有对您的活动的引用（例如在 ProgressDialog 中）。我建议你重构你的代码。例如，您可以在 onStop() 方法中取消（）您的 ProgressDialog。

【讨论】：