我在回收站视图中有一个关于多个计时器的问题。我现在已经有了功能性的rv，但我仍然坚持onStop，onPause，onResume方法。我希望我的应用程序在关闭时继续倒计时。请帮我找到解决方案，我对android有点新鲜。
我的代码：
持有人类
public class MyViewHolder extends RecyclerView.ViewHolder {
private long timeCountInMilliSeconds = 1 * 60000;
public long timeLeft = 0;
private enum TimerStatus {
STARTED,
STOPPED
}
public TextView title;
private TimerStatus timerStatus = TimerStatus.STOPPED;
private ProgressBar progressBarCV;
public TextView textViewTimeCV;
private CountDownTimer countDownTimer;
public MyViewHolder(View view) {
super(view);
initViews(view);
}
private void initViews(View view) {
title = (TextView) view.findViewById(R.id.title);
progressBarCV = (ProgressBar) view.findViewById(R.id.progressBarCV);
textViewTimeCV = (TextView) view.findViewById(R.id.textViewTimeCV);
}
public void startStop(String minutes) {
if (timerStatus == TimerStatus.STOPPED) {
// call to initialize the timer values
setTimerValues(minutes);
// call to initialize the progress bar values
setProgressBarValues();
// changing the timer status to started
timerStatus = TimerStatus.STARTED;
// call to start the count down timer
startCountDownTimer();
} else {
// changing the timer status to stopped
timerStatus = TimerStatus.STOPPED;
stopCountDownTimer();
}
}
private void setTimerValues(String minutes) {
int time = 0;
if (!minutes.isEmpty() || Integer.parseInt(minutes) != 0) {
time = Integer.parseInt(minutes);
}
// assigning values after converting to milliseconds
timeCountInMilliSeconds = time * 60 * 1000;
}
private void startCountDownTimer() {
countDownTimer = new CountDownTimer(timeCountInMilliSeconds, 1000) {
@Override
public void onTick(long millisUntilFinished) {
textViewTimeCV.setText(hmsTimeFormatter(millisUntilFinished));
progressBarCV.setProgress((int) (millisUntilFinished / 1000));
timeLeft = millisUntilFinished;
Log.d("timeLeft", String.valueOf(timeLeft));
}
@Override
public void onFinish() {
textViewTimeCV.setText(hmsTimeFormatter(timeCountInMilliSeconds));
// call to initialize the progress bar values
setProgressBarValues();
// changing the timer status to stopped
timerStatus = TimerStatus.STOPPED;
}
}.start();
}
private void stopCountDownTimer() {
countDownTimer.cancel();
}
private void setProgressBarValues() {
progressBarCV.setMax((int) timeCountInMilliSeconds / 1000);
progressBarCV.setProgress((int) timeCountInMilliSeconds / 1000);
}
private String hmsTimeFormatter(long milliSeconds) {
String hms = String.format("%02d:%02d:%02d",
TimeUnit.MILLISECONDS.toHours(milliSeconds),
TimeUnit.MILLISECONDS.toMinutes(milliSeconds) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(milliSeconds)),
TimeUnit.MILLISECONDS.toSeconds(milliSeconds) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(milliSeconds)));
return hms;
}}
模型类
public class Task {
private String title;
private String time;
public Task() {
}
public Task(String title, String description, String time) {
this.title = title;
this.time = time;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}}
适配器
public class TaskAdapter extends RecyclerView.Adapter<MyViewHolder> {
private List<Task> taskList;
public TaskAdapter(List<Task> taskList) {
this.taskList = taskList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.cardview_layout, parent, false);
MyViewHolder holder = new MyViewHolder(itemView);
return holder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Task task = taskList.get(position);
holder.title.setText(task.getTitle());
holder.textViewTimeCV.setText(task.getTime());
holder.startStop(task.getTime());
}
@Override
public int getItemCount() {
return taskList.size();
}}
主要活动（在此处初始化适配器等）
public class MainActivity extends AppCompatActivity {
public static List<Task> taskList = new ArrayList<>();
private RecyclerView recyclerView;
public static TaskAdapter tAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializeDrawer();
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this, SecondActivity.class));
}
});
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setDrawingCacheEnabled(true);
recyclerView.setItemViewCacheSize(50);
tAdapter = new TaskAdapter(taskList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addOnItemTouchListener(new RecyclerViewTouchListener());
recyclerView.setAdapter(tAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onResume() {
super.onResume();
tAdapter.notifyItemChanged(taskList.size()-1);
}
private void initializeDrawer()
{
AccountHeader headerResult = initializeHeader();
PrimaryDrawerItem item1 = new PrimaryDrawerItem().withIdentifier(1).withName(R.string.app_name);
SecondaryDrawerItem item2 = new SecondaryDrawerItem().withIdentifier(2).withName(R.string.slogan_main);
//create the drawer and remember the `Drawer` result object
Drawer result = new DrawerBuilder()
.withActivity(this)
.withAccountHeader(headerResult)
//.withToolbar(toolbar)
.addDrawerItems(
item1,
new DividerDrawerItem(),
item2,
new SecondaryDrawerItem().withName(R.string.material_drawer_close)
)
.withOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
@Override
public boolean onItemClick(View view, int position, IDrawerItem drawerItem) {
// do something with the clicked item :D
return true;
}
})
.build();
}
private AccountHeader initializeHeader()
{
AccountHeader headerResult = new AccountHeaderBuilder()
.withActivity(this)
.withHeaderBackground(R.drawable.drawable_circle_dark_blue)
.addProfiles(
new ProfileDrawerItem().withName("Mike Penz").withEmail("mikepenz@gmail.com").withIcon(getResources().getDrawable(R.drawable.drawable_circle_dark_blue))
)
.withOnAccountHeaderListener(new AccountHeader.OnAccountHeaderListener() {
@Override
public boolean onProfileChanged(View view, IProfile profile, boolean currentProfile) {
return false;
}
})
.build();
return headerResult;}
第二个活动（这里我将值设置到我的列表中，它连接到我的adadpter）
public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
Task task;
private EditText editTextMinute;
private ImageView imageViewStartStop;
private EditText editTextTitle;
private String title;
private String minutes;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
// method call to initialize the views
initViews();
// method call to initialize the listeners
initListeners();
}
/**
* method to initialize the views
*/
private void initViews() {
editTextMinute = (EditText) findViewById(R.id.editTextMinute);
imageViewStartStop = (ImageView) findViewById(R.id.imageViewStartStop);
editTextTitle = (EditText) findViewById(R.id.editTextTitle);
}
/**
* method to initialize the click listeners
*/
private void initListeners() {
imageViewStartStop.setOnClickListener(this);
}
/**
* implemented method to listen clicks
*
* @param view
*/
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.imageViewStartStop:
prepareTaskData(title, null, minutes);
break;
}
}
private void prepareTaskData(String title, String description, String time) {
time = editTextMinute.getText().toString().trim();
// fetching minutes for Task obj
minutes = editTextMinute.getText().toString();
// fetching value from edit text and type cast to string
title = editTextTitle.getText().toString();
// toast message to fill edit text
if(minutes.isEmpty() || minutes == null || minutes == String.valueOf(0) || title.isEmpty() )
{
Toast.makeText(getApplicationContext(), getString(R.string.message_minutes_or_title), Toast.LENGTH_LONG).show();
}
else
{
task = new Task(title, description, time);
taskList.add(task);
tAdapter.notifyItemChanged(taskList.size() - 1);
finish();
}
}}
也许我应该在我的项目中实现Service类？任何信息泄露都对我非常有用
答案 0 :(得分：0)
您需要在RecyclerView的onCreateViewHolder方法中添加倒计时器，因为onCreateViewHolder只会被调用一次。
每次用户向上或向下滚动时都会调用onBindViewHolder
参考this