我的ListView的意图没有改变我的活动

时间：2018-10-05 04:33:49

标签： java android listview

我正在创建一个闹钟应用程序，该应用程序具有MainActivity上的警报列表，与默认的Android Clock应用程序非常相似。为此，我实现了一个ListView，它显示良好。但是，我一直试图在ListView上设置“更新”按钮，以允许我通过CreateAlarmActivity来更新警报的详细信息，并以此为指导：Intent in ListView。我已经检查了几次，但是在测试过程中按此按钮时，什么也没有发生。该活动只是保留在原处。

我敢肯定这可能是简单而愚蠢的（几乎总是这样），但是我似乎找不到我的错误。也许我需要在AlarmAdapter的onClick方法以及MainActivity的onItemClick中添加一些东西？

代码：

MainActivity.java 

public class MainActivity extends AppCompatActivity {

    ListView alarmListView;
    ArrayList<Alarm> alarmList = new ArrayList<Alarm>();
    AlarmAdapter alarmAdapter;

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

        alarmListView = findViewById(R.id.alarmListView);

        // Credit to Mitch Woodbright for helping with this section, and other try/catch blocks.
        try
        {
            ArrayList<Alarm> alarm = (ArrayList<Alarm>) getIntent().getSerializableExtra("alarmList");
            for(Alarm elements : alarm){
                alarmList.add(elements);
            }
        }
        catch (NullPointerException e){
            //error handling code
        }

        alarmAdapter = new AlarmAdapter(MainActivity.this, alarmList);
        alarmListView.setAdapter(alarmAdapter);
        alarmAdapter.notifyDataSetChanged();

        alarmListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent updateAlarmIntent = new Intent(MainActivity.this, CreateAlarmActivity.class);
                updateAlarmIntent.putExtra("alarmList", alarmList);
                updateAlarmIntent.putExtra("position", position);
                startActivity(updateAlarmIntent);


            }
        });
    }

    // Create alarm when user presses FAB on activity_main.xml.
    public void createNewAlarm(View view) {
        Intent createAlarmIntent = new Intent(this, CreateAlarmActivity.class);
        createAlarmIntent.putExtra("alarmList", alarmList);
        startActivity(createAlarmIntent);
    }


    public void testAlarmActivated(View view){
        Intent activateAlarmIntent = new Intent(this, AlarmActivatedActivity.class);
        startActivity(activateAlarmIntent);
    }
}

CreateAlarmActivity.java 

public class CreateAlarmActivity extends AppCompatActivity {

    // If the alarm is being created, position = -1.
    int position = -1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create_alarm);
        alarmList = (ArrayList<Alarm>)getIntent().getSerializableExtra("alarmList");

        try {
            // If we're updating an alarm, return the position of the alarm to update.
            position = (int)getIntent().getSerializableExtra("position");
        }
        // Else, keep going.
        catch (NullPointerException e){

        }
    }

    int alarmHour = 6;
    int alarmMinute = 0;
    boolean isPm = false;
    int snoozeTimer = 10;
    int [] daysActive = new int[] {0, 0, 0, 0, 0, 0, 0};

    ArrayList<Alarm> alarmList = new ArrayList<Alarm>();

    // Add one to the hour of the alarm.
    public void changeHour(View view) {
        Button btn = findViewById(R.id.buttonHours);

        if (alarmHour == 12){
            alarmHour = 0;
        }
        else {
            alarmHour++;
        }

        btn.setText(Integer.toString(alarmHour));

    }

    // Add one to the minute of the alarm.
    public void changeMinute(View view) {
        Button btn = findViewById(R.id.buttonMinutes);

        if (alarmMinute == 59) {
            alarmMinute = 0;
        }
        else {
            alarmMinute++;
        }

        if (alarmMinute < 10) {
            // Ensure minute 1 becomes 01, e.g, 6:01 am.
            btn.setText("0" + Integer.toString(alarmMinute));
        }
        else {
            btn.setText(Integer.toString(alarmMinute));
        }
    }

    public void changeAmPm(View view) {
        Button btn = findViewById(R.id.buttonAmPm);
        if (isPm == true) {
            isPm = false;
            btn.setText("am");
        }
        else {
            isPm = true;
            btn.setText("pm");
        }
    }

    public void changeSnoozeTimer(View view) {
        Button btn = findViewById(R.id.buttonSnoozeTimer);
        if (snoozeTimer == 15){
            snoozeTimer = 1;
        }
        else {
            snoozeTimer++;
        }
        btn.setText(Integer.toString(snoozeTimer));
    }

    public void finishAlarm(View view){
        EditText alarmName = findViewById(R.id.alarmName);
        String name = alarmName.getText().toString();
        Alarm alarm = new Alarm(name, alarmHour, alarmMinute, isPm, daysActive, snoozeTimer);

        // If we're creating an alarm.
        if (position == -1) {

            try {
                alarmList.add(alarm);
            } catch (Exception e) {

            }
        }

        // Else, we're updating one.
        else {
            try {
                // Set the alarm we're updating to the new alarm.
                alarmList.set(position, alarm);
            } catch (Exception e) {

            }
        }
        Intent finishAlarmIntent = new Intent(this, MainActivity.class);
        finishAlarmIntent.putExtra("alarmList", alarmList);
        startActivity(finishAlarmIntent);
    }


    public void cancelAlarm(View view){
        Intent cancelAlarmIntent = new Intent(this, MainActivity.class);
        cancelAlarmIntent.putExtra("alarmList", alarmList);
        startActivity(cancelAlarmIntent);
    }

    public void deleteAlarm(View view) {

        // If creating a new alarm, deleting is the same as cancelling.
        if (position == -1) {
            cancelAlarm(view);
        }
        else {
            // Remove the alarm.
            alarmList.remove(position);
            // Move each other alarm down one in the list.
            for (int i = position; i < alarmList.size() - 1; i++){
                Alarm tempAlarm = alarmList.get(i + 1);
                alarmList.set(i, tempAlarm);
            }
            // Eliminate last item in the list, preventing duplicates.
            alarmList.remove(alarmList.size() - 1);
        }
    }

    public void changeSunday(View view) {
        Button btn = findViewById(R.id.buttonSunday);
        if (daysActive[0] == 0){
            daysActive[0] = 1;
            // Source: https://stackoverflow.com/questions/2173936/how-to-set-background-color-of-a-view
            // Credit goes to EddieB for the below line.
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[1] = 0;
            // Source: https://stackoverflow.com/questions/14802354/how-to-reset-a-buttons-background-color-to-default
            // Credit goes to Ivo for the below line.
            btn.getBackground().clearColorFilter();
        }
    }

    public void changeMonday(View view) {
        Button btn = findViewById(R.id.buttonMonday);
        if (daysActive[1] == 0){
            daysActive[1] = 1;
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[1] = 0;
            btn.getBackground().clearColorFilter();
        }
    }

    public void changeTuesday(View view) {
        Button btn = findViewById(R.id.buttonTuesday);
        if (daysActive[2] == 0){
            daysActive[2] = 1;
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[2] = 0;
            btn.getBackground().clearColorFilter();
        }
    }

    public void changeWednesday(View view) {
        Button btn = findViewById(R.id.buttonWednesday);
        if (daysActive[3] == 0){
            daysActive[3] = 1;
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[3] = 0;
            btn.getBackground().clearColorFilter();
        }
    }

    public void changeThursday(View view) {
        Button btn = findViewById(R.id.buttonThursday);
        if (daysActive[4] == 0){
            daysActive[4] = 1;
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[4] = 0;
            btn.getBackground().clearColorFilter();
        }
    }

    public void changeFriday(View view) {
        Button btn = findViewById(R.id.buttonFriday);
        if (daysActive[5] == 0){
            daysActive[5] = 1;
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[5] = 0;
            btn.getBackground().clearColorFilter();
        }
    }

    public void changeSaturday(View view) {
        Button btn = findViewById(R.id.buttonSaturday);
        if (daysActive[6] == 0){
            daysActive[6] = 1;
            btn.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.DARKEN);
        }
        else {
            daysActive[6] = 0;
            btn.getBackground().clearColorFilter();
        }
    }

}

AlarmAdapter.java 

public class AlarmAdapter extends BaseAdapter{

    private Context alarmContext;
    private ArrayList<Alarm> alarmList;

    public AlarmAdapter(Context context, ArrayList arrayList) {
        super();
        alarmContext = context;
        alarmList = arrayList;
    }

    public int getCount() {
        try{
            return alarmList.size();
        }catch(Exception e){
            return 0;
        }

    }

    // getView method is called for each item of ListView
    public View getView(int position, View view, ViewGroup parent) {
        // inflate the layout for each item of listView
        LayoutInflater inflater = (LayoutInflater) alarmContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.alarm_row, parent, false);


        // get the reference of textView and button
        TextView alarmName = (TextView) view.findViewById(R.id.listRowAlarmName);
        TextView alarmTime = view.findViewById(R.id.listRowAlarmTime);
        TextView alarmAmPm = view.findViewById(R.id.listRowAlarmAmPm);
        TextView alarmDaysActive = view.findViewById(R.id.listRowAlarmDaysActive);
        TextView alarmSnoozeTimer = view.findViewById(R.id.listRowAlarmSnoozeTimer);

        Button updateButton = (Button) view.findViewById(R.id.listRowAlarmUpdate);

        // Set the title and button name
        Alarm tempAlarm = alarmList.get(position);
        alarmName.setText(tempAlarm.name);

        // Set minute if 0-9 to 00-09.
        String minute = Integer.toString(tempAlarm.minute);
        if (tempAlarm.minute < 10){
            minute = "0" + minute;
        }
        alarmTime.setText(tempAlarm.hour + ":" + minute);

        // Set AM or PM based on Boolean.
        if (tempAlarm.isPm == true){
            alarmAmPm.setText("PM");
        }
        else {
            alarmAmPm.setText("AM");
        }
        // Figure out best way to change color of letters in text based on daysActive.
        alarmSnoozeTimer.setText("Snooze Timer: " + tempAlarm.snoozeTimer + " minutes");
        //updateButton.setText("Action " + position);

        // Click listener of button
// Do I need this, since I'm overriding it in MainActivity? Find out.
        updateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Logic goes here.
            }
        });

        return view;
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }}

alarm_row.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="96dp"
    android:orientation="horizontal"
    android:padding="5dip">

    <TextView
        android:id="@+id/listRowAlarmName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="10dp"
        android:layout_marginTop="5dp"
        android:layout_toEndOf="@+id/listRowAlarmAmPm"
        android:text="Name of Alarm"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/listRowAlarmTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="8dp"
        android:layout_marginTop="4dp"
        android:text="TIME"
        android:textSize="28sp" />

    <TextView
        android:id="@+id/listRowAlarmDaysActive"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/listRowAlarmName"
        android:layout_marginStart="10dp"
        android:layout_toEndOf="@+id/listRowAlarmAmPm"
        android:text="S M T W T F S"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/listRowAlarmAmPm"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginStart="8dp"
        android:layout_marginTop="4dp"
        android:layout_toEndOf="@+id/listRowAlarmTime"
        android:text="PM"
        android:textSize="28sp" />

    <TextView
        android:id="@+id/listRowAlarmSnoozeTimer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/listRowAlarmDaysActive"
        android:layout_marginStart="10dp"
        android:layout_toEndOf="@+id/listRowAlarmAmPm"
        android:text="Snooze Timer: N minutes"
        android:textSize="16sp" />

    <Button
        android:id="@+id/listRowAlarmUpdate"
        android:layout_width="133dp"
        android:layout_height="42dp"
        android:layout_below="@+id/listRowAlarmName"
        android:layout_marginTop="13dp"
        android:layout_marginEnd="-52dp"
        android:layout_toStartOf="@+id/listRowAlarmAmPm"
        android:text="Update"
        android:textSize="16sp" />

</RelativeLayout>

2 个答案:

答案 0 :(得分：0)

请按照@Parul所述删除alarmListView.setOnItemClickListener

并在适配器中将updateButton替换为整个view。

 view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent updateAlarmIntent = new Intent(MainActivity.this, CreateAlarmActivity.class);
            updateAlarmIntent.putExtra("alarmList", alarmList);
            updateAlarmIntent.putExtra("position", position);
            startActivity(updateAlarmIntent);
        }
    });

答案 1 :(得分：0)

如果您只想对“更新”按钮执行操作，请执行此操作。

在适配器的getView（）方法中

updateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // Logic goes here.
           onUpdateClick(position, alarmList); // public method in adapter
        }
    });

然后在适配器中创建公共方法：

public void onUpdateClick(int position, ArrayList<alarm> alarmList){

}

现在在初始化适配器时在活动中覆盖此方法：

alarmAdapter = new AlarmAdapter(MainActivity.this, alarmList){
    @Override
    public void onUpdateClick(int position, ArrayList<alarm> alarmList) {
                super.onUpdateClick(position, alarmList);
                Intent updateAlarmIntent = new Intent(MainActivity.this, 
                            CreateAlarmActivity.class);
                updateAlarmIntent.putExtra("alarmList", alarmList);
                updateAlarmIntent.putExtra("position", position);
                startActivity(updateAlarmIntent);
      }
};
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