我知道这个问题被问了好几次，但我似乎无法用提供的任何答案来回答。我只想点击一个按钮，结束我目前正在进行的活动，然后转到另一个活动。我也想从后堆栈中删除它，所以我在警报对话框中做了以下操作：
private void AlertMessage()
{
AlertDialog alertDialog = new AlertDialog.Builder(this, android.R.style.Widget_Material_ButtonBar_AlertDialog)
//set icon
.setIcon(android.R.drawable.ic_dialog_alert)
//set title
.setTitle("YOU ARE ABOUT TO EXIT!!!")
//set message
.setMessage("Exiting will cancel this process")
//set positive button
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//set what would happen when positive button is clicked
//RESETTING FIRST THEN RETURN TO MAIN MENU
if (Build.VERSION.SDK_INT >= 26)
{
// recreate();
// pb.setProgress(0);
Toast.makeText(tool1mode1.this, "Exit", Toast.LENGTH_SHORT).show();
Intent goingback = new Intent(tool1mode1.this, Settings.class);
goingback.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NO_HISTORY);
finishAffinity();
tool1mode1.this.finish();
overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right);
startActivity(goingback);
}
}
})
//set negative button
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//set what should happen when negative button is clicked
Toast.makeText(getApplicationContext(),"Cancelled",Toast.LENGTH_LONG).show();
}
})
.show();
}
然而，当我在以为我结束了我参加的活动后去参加另一项活动时，我仍然从本该结束的活动中得到了一些东西。我的振动和祝酒词信息是在我参加的活动中触发的，尽管活动本应结束，但它们仍不断出现。
那么我需要做什么呢？顺便说一句，这个应用程序是一个可穿戴的应用程序，以防它的工作方式与手机不同
简而言之，我想一劳永逸地结束这个活动，并将其从后堆栈中清除。
编辑：关于系统服务，我确实在倒计时的不同时间触发振动
private void startTimer() {
Log.println(Log.ASSERT, "CHECK","Entered startTimer() method");
millisInFuture = mTimeLeftInMillis;
mCountDownTimer = new CountDownTimer(mTimeLeftInMillis, 1000) {
@Override
public void onTick(long millisUntilFinished) {
mTimeLeftInMillis = millisUntilFinished;
updateCountDownText();
millisPassed = millisInFuture - mTimeLeftInMillis;
progress = (int) ((millisPassed * 100 / millisInFuture));
pb.setProgress(progress);
// pb2.setProgress(0);
// pb3.setProgress(0);
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//Key: 60 sec
if (millisInFuture == 480000) {
if (millisPassed <= 60000 || (millisPassed > 180000 && millisPassed <= 240000) || (millisPassed > 300000 && millisPassed <= 360000 || (millisPassed > 420000 && millisPassed <= 480000))) {
// Animation animation = AnimationUtils.loadAnimation(tool1mode1.this, R.anim.fade_in);
// stepupimage.setAnimation(animation);
Log.println(Log.ASSERT,"CHECK","Check that the first if statement of key 60 is entered");
statusIfUp();
time_of_stage = (millisInFuture - millisPassed) % 60000;
// progress2 = (int) (time_of_stage*100 / 60000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress2= "+progress2);
// pb2.setProgress(progress2);
updateStageUpCount();
upArrowAnimation();
setflowrate();
} else if ((millisPassed > 60000 && millisPassed <= 180000)) {
// Animation animation = AnimationUtils.loadAnimation(tool1mode1.this, R.anim.fade_in);
// stepdownimage.setAnimation(animation);
Log.println(Log.ASSERT,"CHECK","Check that the second if statement of key 60 is entered");
statusIfDown();
time_of_stage = (millisInFuture - (millisPassed+60000)) % 120000; //CREDIT GOES TO BASHMOHNDES AMIN
// progress3 = (int) (time_of_stage*100 / 120000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
} else if ((millisPassed > 240000 && millisPassed <= 300000) || (millisPassed > 360000 && millisPassed <= 420000)){
// Animation animation = AnimationUtils.loadAnimation(tool1mode1.this, R.anim.fade_in);
// stepdownimage.setAnimation(animation);
Log.println(Log.ASSERT,"CHECK","Check that the first if statement of key 60 is entered");
statusIfDown();
time_of_stage = (millisInFuture - millisPassed) % 60000;
// progress3 = (int) (time_of_stage*100 / 60000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
}
}
//key:90 sec ----> 01:30
else if (millisInFuture == 720000) {
if ((millisPassed <= 90000) || (millisPassed > 270000 && millisPassed <= 360000)
|| (millisPassed > 450000 && millisPassed <= 540000)
|| (millisPassed > 630000 && millisPassed <= 720000)) {
// Animation animation = AnimationUtils.loadAnimation(tool1mode1.this, R.anim.fade_in);
// stepupimage.setAnimation(animation);
statusIfUp();
time_of_stage = (millisInFuture - millisPassed) % 90000;
// progress2 = (int) (time_of_stage*100 / 90000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress2= "+progress2);
// pb2.setProgress(progress2);
updateStageUpCount();
upArrowAnimation();
setflowrate();
} else if ((millisPassed > 90000 && millisPassed <= 270000)) {
statusIfDown();
time_of_stage = ((millisInFuture+90000) - millisPassed) % 180000;
// progress3= (int) (time_of_stage*100 / 180000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
} else if ((millisPassed > 360000 && millisPassed <= 450000) || (millisPassed > 540000 && millisPassed <= 630000)) {
// Animation animation = AnimationUtils.loadAnimation(tool1mode1.this, R.anim.fade_in);
// stepdownimage.setAnimation(animation);
statusIfDown();
time_of_stage = (millisInFuture - millisPassed) % 90000;
// progress3= (int) (time_of_stage*100 / 90000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
}
}
//key:120 sec ----> 02:00
else if (millisInFuture == 960000) {
if (millisPassed <= 120000 || millisPassed > 360000 && millisPassed <= 480000 || millisPassed > 600000 && millisPassed <= 720000 || millisPassed > 840000 && millisPassed <= 960000) {
statusIfUp();
time_of_stage = (millisInFuture - millisPassed) % 120000;
// progress2 = (int) (time_of_stage*100 / 120000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress2= "+progress2);
// pb2.setProgress(progress2);
updateStageUpCount();
upArrowAnimation();
setflowrate();
} else if (millisPassed > 120000 && millisPassed <= 360000) {
statusIfDown();
time_of_stage = ((millisInFuture+120000) - millisPassed) % 240000;
// progress3= (int) (time_of_stage*100 / 240000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
} else if (millisPassed > 480000 && millisPassed <= 600000 || millisPassed > 720000 && millisPassed <= 840000) {
statusIfDown();
time_of_stage = (millisInFuture - millisPassed) % 120000;
// progress3= (int) (time_of_stage*100 / 120000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
}
}
//key:20 sec ----> 00:20
else if (millisInFuture == 160000) {
if (millisPassed <= 20000 || millisPassed > 60000 && millisPassed <= 80000 || millisPassed > 100000 && millisPassed <= 120000 || millisPassed > 140000 && millisPassed <= 160000) {
statusIfUp();
time_of_stage = (millisInFuture - millisPassed) % 20000;
// progress2 = (int) (time_of_stage*100 / 20000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress2= "+progress2);
// pb2.setProgress(progress2);
updateStageUpCount();
upArrowAnimation();
setflowrate();
} else if (millisPassed > 20000 && millisPassed <= 60000) {
statusIfDown();
time_of_stage = ((millisInFuture+20000) - millisPassed) % 40000;
// progress3 = (int) (time_of_stage*100 / 40000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress2= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
} else if (millisPassed > 80000 && millisPassed <= 100000 || millisPassed > 120000 && millisPassed <= 140000) {
statusIfDown();
time_of_stage = (millisInFuture - millisPassed) % 20000;
progress3 = (int) (time_of_stage*100 / 20000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
}
}
//key:30 sec ----> 00:30
else if (millisInFuture == 240000) {
if (millisPassed <= 30000 || millisPassed > 90000 && millisPassed <= 120000 || millisPassed > 150000 && millisPassed <= 180000 || millisPassed > 210000 && millisPassed <= 240000) {
statusIfUp();
time_of_stage = (millisInFuture - millisPassed) % 30000;
// progress2 = (int) (time_of_stage*100 / 30000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress2= "+progress2);
// pb2.setProgress(progress2);
updateStageUpCount();
upArrowAnimation();
setflowrate();
} else if (millisPassed > 30000 && millisPassed <= 90000) {
statusIfDown();
time_of_stage = ((millisInFuture + 30000) - millisPassed) % 60000;
// progress3 = (int) (time_of_stage*100 / 60000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
} else if (millisPassed > 120000 && millisPassed <= 150000 || millisPassed > 180000 && millisPassed <= 210000) {
statusIfDown();
time_of_stage = (millisInFuture - millisPassed) % 30000;
progress3 = (int) (time_of_stage*100 / 30000);
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
// Log.println(Log.VERBOSE,"CHECK","progress3= "+progress3);
// pb3.setProgress(progress3);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
}
}
//key:60 sec ----> 01:00
else if (millisInFuture == 480000) {
if (millisPassed <= 60000 || (millisPassed > 180000 && millisPassed <= 240000) || (millisPassed > 300000 && millisPassed <= 360000 || (millisPassed > 420000 && millisPassed <= 480000))) {
statusIfUp();
time_of_stage = (millisInFuture - millisPassed) % 60000;
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
upArrowAnimation();
setflowrate();
} else if ((millisPassed > 60000 && millisPassed <= 180000)) {
statusIfDown();
time_of_stage = (millisInFuture - (millisPassed+60000)) % 120000; //CREDIT GOES TO BASHMOHNDES AMIN
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
updateStageDownCount();
downArrowAnimation();
setFlowratetozero();
} else if ((millisPassed > 240000 && millisPassed <= 300000) || (millisPassed > 360000 && millisPassed <= 420000)){
statusIfDown();
time_of_stage = (millisInFuture - millisPassed) % 60000; //CREDIT GOES TO BASHMOHNDES AMIN
Log.println(Log.VERBOSE,"CHECK","TIME OF STAGE = "+time_of_stage);
updateStageDownCount();
downArrowAnimation();
setflowrate();
}
}
}
@Override
public void onFinish() {
Toast.makeText(tool1mode1.this, "Done", Toast.LENGTH_SHORT).show();
avd2.stop(); avd3.stop();
try {
pb.setProgress(100);
// pb2.setProgress(0); pb3.setProgress(0);
stage_timer.setVisibility(View.INVISIBLE);
rotateLoading.setTranslationY(60);
rotateLoading.stop();
// progressBar.setVisibility(View.INVISIBLE);
// progressBar2.setVisibility(View.INVISIBLE);
// progressBar.setProgress(0);
// progressBar2.setProgress(0);
// progressBar.setTranslationY(60);
// progressBar2.setTranslationY(60);
flow.setTranslationY(60);
animation1.cancel(); animation2.cancel();
Intent stoppump = new Intent(tool1mode1.this, stop_pump.class);
startActivity(stoppump);
//Vibration
if (Build.VERSION.SDK_INT >= 26) {
((Vibrator) getSystemService(VIBRATOR_SERVICE)).vibrate(VibrationEffect.createOneShot(150, VibrationEffect.DEFAULT_AMPLITUDE));
} else {
((Vibrator) getSystemService(VIBRATOR_SERVICE)).vibrate(VibrationEffect.createWaveform(new long[]{150}, new int[]{VibrationEffect.EFFECT_CLICK}, -1));
}
}
catch (NullPointerException e) {
e.printStackTrace();
}
}
}.start();
这是当倒计时结束时，另一个是在总时间内的不同阶段：
private void stageSwitchVibration()
{
Toast.makeText(tool1mode1.this, "stage switch", Toast.LENGTH_SHORT).show();
//Vibration
if (Build.VERSION.SDK_INT >= 26) {
((Vibrator) getSystemService(VIBRATOR_SERVICE)).vibrate(VibrationEffect.createOneShot(300, VibrationEffect.DEFAULT_AMPLITUDE));
} else {
((Vibrator) getSystemService(VIBRATOR_SERVICE)).vibrate(VibrationEffect.createWaveform(new long[]{150}, new int[]{VibrationEffect.EFFECT_CLICK}, -1));
}
}
您的mCountDownTimer是否链接到您的活动？如果是这样，您可能需要在onDestroy()方法中调用mCountDownTimer.cancel();，即：
@Override
protected void onDestroy() {
super.onDestroy();
mCountDownTimer.cancel();
}
注册的侦听器等与活动无关。如果你有活跃的听众，无论活动是否完成，他们都会保留对活动的引用。如果您没有关闭所有侦听器，那么实际上会造成内存泄漏。
(生命周期感知组件除外，例如ViewModel、LiveData(
这通常也可以通过正确实现MVVM、MVC等模式并了解哪些组件需要初始化/去初始化来避免。
从中得到的主要收获是活动/片段/服务等中的任何代码。不会在完成或停止时突然不再运行。
跟踪侦听器/回调或类似情况，并检查它们是否具有生命周期意识。如果没有，您需要自己注销它们。