java - 保留 Android 进度条或恢复它

Question

我想知道如何保持进度条的状态或从中断处恢复。让我解释一下，这是一个带有进度条的计时器，当用户关闭 Activity 或关闭 Activity 时，计时器将作为后台服务启动(计时器正常工作)，我希望当用户关闭 Activity 或关闭 Activity 时应用程序，当他返回时，进度条将恢复到原来的位置。现在发生的情况是，当它返回计时器时，进度条返回到零。这是我的适配器代码，其中发生类(class)和计时器服务

这就是我保存进度条状态的方法

private static SharedPreferences.Editor pref;
private static int saveProgressBarState;
private static SharedPreferences getProgressBarState;

private CountDownTimer countDown(final long time, final ProgressBar lessonProgress, long originalTimerSize) {

        final int timerLengthInSecond = (int) time / 1_000;

        lessonProgress.setMax((int) originalTimerSize / 1_000);

        return new CountDownTimer(time, 1000) {
            @Override
            public void onTick(long l) {

                long secondRemaining = l / 1_000;

                lessonProgress.setProgress((int) (timerLengthInSecond - secondRemaining));

                //Getting progress of progress bar
                saveProgressBarState = lessonProgress.getProgress();

            }

            @Override
            public void onFinish() {

                lessonProgress.setProgress(timerLengthInSecond);
            }
        };

    }

//this method is called when onPause() is called on the activity
public static void runLessonTimerInBackground(Context context) {

        pref = context.getSharedPreferences("LESSONPROGRESS", MODE_PRIVATE).edit();
        pref.putInt("savedprogress", progressBarStateSave);
        pref.apply();

    }

我想获取保存的进度条状态并恢复原来的进度并继续进度

Answer 1

您需要在 onResume() 中添加这些链接，我假设您可以在类(class)的实际进度中进行调整和应用它

int lastProgress = pref.getInt("savedprogress", 0); //0 is default value

lessonProgress.setProgress(lastProgress); //this will set the progress

//here you might also need to do some other stuff related to your code and req
//you can also resume your lesson video from here, etc.

如果您想在 sharePref 中保存多个类(class)进度，我建议您保存进度，例如

String progressPrefName = "savedProgress_" + lessonID; //here lessonID is lesson's unique ID
pref.putInt(progressPrefName, progressBarStateSave); // here pass the name which can be "savedProgress_1" referring to lesson with ID 1

然后你就可以得到它了

String progressPrefName = "savedProgress_" + lessonID; 

int lastProgress = pref.getInt(progressPrefName, 0); //0 is default value

lessonProgress.setProgress(lastProgress); //this will set the progress