RecyclerView 中每个按钮的 TimePicker

Question

我想要完成的事情- recyclerview 有一个应用程序列表，每行都包含一个按钮。当您单击该按钮时，会出现一个时间选择器，您可以在其中选择倒计时的时长。然后选择的时间出现在按钮上。当您点击开始按钮时，倒计时开始，按钮上的时间开始倒计时。

我最初在 AppLimitScreen.java 中创建了一个按钮，并在没有按钮在回收站视图内的情况下完成了上述操作：

public class AppLimitScreen extends AppCompatActivity {

private int numberOfInstalledApps;
private List<ApplicationInfo> apps;
private ArrayList<AppInfo> res;

//for countdown
static Button chooseTime;
static int Chour, Cminute;
static TimePickerDialog timePickerDialog;
DialogFragment dialogFragment;
private CountDownTimer mCountDownTimer;
static ImageView image;

private Button mButtonStart;

private List<AppLimit> appLimitList = new ArrayList<>();
private RecyclerView recyclerView;
private AppLimitAdapter alAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_app_limit_screen);

    numberOfInstalledApps = getPackageManager().getInstalledApplications(0).size();
    apps = getPackageManager().getInstalledApplications(0);
    res = new ArrayList<AppInfo>();

    mButtonStart = findViewById(R.id.startTimes);

    chooseTime = (Button) findViewById(R.id.app_button1);
    image = (ImageView) findViewById(R.id.imageView1);
    image.setVisibility(View.VISIBLE);
    Chour = 0;
    Cminute = 0;

    chooseTime.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialogFragment = new TimePickerclass();
            dialogFragment.show(getSupportFragmentManager(), "Time Picker");
        }
    });


    mButtonStart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startTimer();
        }
    });
    updateCountDownText();

    recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

    alAdapter = new AppLimitAdapter(appLimitList);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.setItemAnimator(new DefaultItemAnimator());

    recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));

    recyclerView.setAdapter(alAdapter);

    prepareAppLimitData();
}

private static long START_TIME_IN_MILLIS = 0;
private static long mTimeLeftInMillis = START_TIME_IN_MILLIS;

public static class TimePickerclass extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState){

        timePickerDialog = new TimePickerDialog(getActivity(),
                AlertDialog.THEME_HOLO_LIGHT,this,Chour,Cminute,true);

        //  timePickerDialog4.setButton(DialogInterface.BUTTON_POSITIVE, "Start", timePickerDialog4);

        return timePickerDialog;
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute){

        chooseTime.setText(hourOfDay + "h " + minute + "m" + " 00s");
        START_TIME_IN_MILLIS = (hourOfDay * 3600000) + (minute * 60000);
        mTimeLeftInMillis = START_TIME_IN_MILLIS;
        image.setVisibility(View.INVISIBLE);
    }
}

private void updateCountDownText() {

    int hours = (int) ((mTimeLeftInMillis / 1000) / 60) / 60;
    int minutes = (int) (mTimeLeftInMillis / 1000) / 60;
    int seconds = (int) (mTimeLeftInMillis / 1000) % 60;
    if (minutes > 59) {
        minutes = (minutes % 60);
        hours += (minutes / 60);
    }

    String timeLeftFormatted = String.format(Locale.getDefault(), "%02dh %02dm %02ds", hours, minutes, seconds);
    chooseTime.setText(timeLeftFormatted);

    if (hours != 0 || minutes != 0 || seconds != 0) {
        image.setVisibility(View.INVISIBLE);
        chooseTime.setClickable(false);
    }
    else {
        image.setVisibility(View.VISIBLE);
        chooseTime.setClickable(true);
        chooseTime.setText("");
    }
}


private void startTimer() {

    mCountDownTimer = new CountDownTimer(mTimeLeftInMillis, 1000) {
        @Override
        public void onTick(long millisUntilFinished) {
            mTimeLeftInMillis = millisUntilFinished;
            updateCountDownText();
        }

        @Override
        public void onFinish() {}
    }.start();

}

private void prepareAppLimitData() {
    AppLimit appLimit;

    for (int i = 0; i < apps.size(); i++) {
        if (getPackageManager().getLaunchIntentForPackage(apps.get(i).packageName) != null) {
            // Non-System App
            ApplicationInfo p = apps.get(i);
            AppInfo newInfo = new AppInfo();
            newInfo.appname = p.loadLabel(getPackageManager()).toString();
            newInfo.icon = p.loadIcon(getPackageManager());
            res.add(newInfo);
            appLimit = new AppLimit(newInfo.appname, newInfo.icon);
            appLimitList.add(appLimit);
        } else {
            // System Apps
        }
    }

    alAdapter.notifyDataSetChanged();
} 
}

然后我创建了 recyclerview 并为每一行添加了一个按钮。 AppLimitAdapter 的代码如下所示：

public class AppLimitAdapter extends RecyclerView.Adapter<AppLimitAdapter.MyViewHolder> {
private List<AppLimit> appLimitList;
private Context context;

public AppLimitAdapter(Context context) {
    this.context = context;
}


public class MyViewHolder extends RecyclerView.ViewHolder { 
    public TextView name;
    public ImageView icon;
    public Button button;
    public ImageView image;


    public MyViewHolder(View view) {
        super(view);

        name = (TextView) view.findViewById(R.id.name);
        icon = (ImageView) view.findViewById(R.id.icon);
        image = (ImageView) view.findViewById(R.id.imageTimer);
        button = (Button) view.findViewById(R.id.button);
    }
}

public AppLimitAdapter(List<AppLimit> appLimitList) {
    this.appLimitList = appLimitList;
}


@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.app_limit_list_row, parent, false);

    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
    AppLimit appLimit = appLimitList.get(position);
    holder.name.setText(appLimit.getName());
    holder.icon.setImageDrawable(appLimit.getIcon());
    holder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // when each button is clicked, action goes here

        }
    });

}


@Override
public int getItemCount() {
    return appLimitList.size();
}

@Override
public int getItemViewType(int position) {
    return position;
}
}

我已经尝试从 AppLimitScreen.java 复制代码并将其放在 onBindViewHolder 中的 onClick 中，但我遇到了错误，我确信有更好的方法可以做到这一点。

我该如何实施？

Answer 1

我想要完成的事情- recyclerview 有一个应用程序列表，每行都包含一个按钮。当您单击该按钮时，会出现一个时间选择器，您可以在其中选择倒计时的时长。然后选择的时间出现在按钮上。当您点击开始按钮时，倒计时开始，按钮上的时间开始倒计时。

RecyclerView 中每个按钮的 TimePicker

TimePicker for each button inside RecyclerView

android-studio

android-recyclerview

timepicker