Anzeige des aktuellen Datums in der ersten Position für aufeinanderfolgende 3 Monate wie (aktuell, vorheriges, nächstes) aus einer Liste

Question

Ich möchte das aktuelle Datum als erste Position in einem TextView Formular anzeigen, das 3 Monate in einer Liste als (aktuelle ,Vorherige Nächste). Wie kann ich das machen?

private void CalculateDates() { 

    //to calculate the date I've used this function 
     DateRange = new ArrayList<String>(); 
     boolean loopVal = true; 
     SimpleDateFormat formatter = new SimpleDateFormat(" E ddMMMyyyy"); 
     Calendar calendar = Calendar.getInstance(); 
     calendar.add(Calendar.MONTH, -1); 

    //textView is the TextView view that should display it 
     String StartDate = formatter.format(calendar.getTime()); 
     calendar.add(Calendar.MONTH, 2); 
     String EndDate = formatter.format(calendar.getTime()); 
     DateRange.add(StartDate); 
     Date date = null; 
     try { 
       while (loopVal) { 
        date = formatter.parse(StartDate); 

        Calendar cal = Calendar.getInstance(); 

        cal.setTime(date); 
       } 
     }catch(Exception e){ 

     } 
    } 

Answer 1

Sie können versuchen, wie dies ich für Sie tun.

bearbeiten Like this

public class MainActivity extends ActionBarActivity { 

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

    TextView tView = (TextView) findViewById(R.id.textView1); 

    ArrayList<String> threDate = get3Dates(); 
    //tView.setText(threDate.toString()); 
    String dates = ""; 

    for (int i = 0; i < threDate.size(); i++) { 
     dates+= threDate.get(i).toString()+" "; 
    } 

    tView.setText(dates); 
} 


private ArrayList<String> get3Dates(){ 

    SimpleDateFormat formatter = new SimpleDateFormat(" E dd MMM yyyy"); 

    ArrayList<String> three_date = new ArrayList<String>(); 
    Calendar calendar = Calendar.getInstance(); 

    //Current Date 
    String current_date = formatter.format(calendar.getTime()); 
    three_date.add(current_date);//only date 
    //three_date.add("Present Date: "+current_date);//or with label 

    //Previous Date 
    calendar.add(Calendar.MONTH, -1); 
    String previous_date = formatter.format(calendar.getTime()); 
    three_date.add(previous_date);//only date 
    //three_date.add("Previous Date: "+previous_date);//or with label 

    //Future Date 
    calendar.add(Calendar.MONTH, 2); 
    String future_date = formatter.format(calendar.getTime()); 
    three_date.add(future_date);//only date 
    //three_date.add("Next Date: "+future_date);//or with label 

    return three_date; 
} 

} 

und Plan xml wie diese

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 

<HorizontalScrollView 
    android:id="@+id/horizontalScrollView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" > 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="horizontal" > 
     <TextView 
      android:id="@+id/textView1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentTop="true" 
      android:layout_marginLeft="20dp" 
      android:text="Large Text" 
      android:textAppearance="?android:attr/textAppearanceLarge" /> 
    </LinearLayout> 
    </HorizontalScrollView> 
</LinearLayout> 

ich Ihnen ein anderes Beispiel zu tun. Hier können Sie auf Weiter klicken, um das nächste und vorherige Datum zu erhalten. Layout xml wie unten

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 

<TextView 
    android:id="@+id/textView3" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Navigable(Next-Priv) Example" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:weightSum="10" > 

    <TextView 
     android:id="@+id/tvPrev" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_weight="1.5" 
     android:gravity="left|center_vertical" 
     android:text="&lt;&lt;" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 

    <TextView 
     android:id="@+id/tvDate" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_weight="7" 
     android:gravity="center_vertical|center_horizontal" 
     android:text="Large Text" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 

    <TextView 
     android:id="@+id/tvNext" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_weight="1.5" 
     android:gravity="right|center_vertical" 
     android:text=">>" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 
</LinearLayout> 

<TextView 
    android:id="@+id/textView2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="30dp" 
    android:text="Simple TextView with Scroll:" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<HorizontalScrollView 
    android:id="@+id/horizontalScrollView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" > 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="horizontal" > 

     <TextView 
      android:id="@+id/textView1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentTop="true" 
      android:layout_marginLeft="20dp" 
      android:text="Large Text" 
      android:textAppearance="?android:attr/textAppearanceLarge" /> 
    </LinearLayout> 
</HorizontalScrollView> 

Java-Code in Aktivitätsklasse

public class MainActivity extends ActionBarActivity { 


TextView tvPriv, tvDate, tvNext; 


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

    tvPriv = (TextView) findViewById(R.id.tvPrev); 
    tvDate = (TextView) findViewById(R.id.tvDate); 
    tvNext = (TextView) findViewById(R.id.tvNext); 

    final SimpleDateFormat formatter = new SimpleDateFormat(" E dd MMM yyyy"); 
    final Calendar calendar = Calendar.getInstance(); 
    String curent_date = formatter.format(calendar.getTime()); 
    tvDate.setText(curent_date); 


    tvPriv.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View v){ 
       calendar.add(Calendar.MONTH, -1); 
       String prev_date = formatter.format(calendar.getTime()); 
       tvDate.setText(prev_date); 
      } 
     }); 



    tvNext.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v){ 
      calendar.add(Calendar.MONTH, +1); 
      String next_date = formatter.format(calendar.getTime()); 
      tvDate.setText(next_date); 
     } 
    }); 



    //Simple textView example 
    TextView tView = (TextView) findViewById(R.id.textView1); 

    ArrayList<String> threDate = get3Dates(); 
    //tView.setText(threDate.toString()); 
    String dates = ""; 

    for (int i = 0; i < threDate.size(); i++) { 
     dates+= threDate.get(i).toString()+" "; 
    } 

    tView.setText(dates); 


    } 



private ArrayList<String> get3Dates(){ 

    SimpleDateFormat formatter = new SimpleDateFormat(" E dd MMM yyyy"); 

    ArrayList<String> three_date = new ArrayList<String>(); 
    Calendar calendar = Calendar.getInstance(); 

    //Current Date 
    String current_date = formatter.format(calendar.getTime()); 
    three_date.add(current_date);//only date 
    //three_date.add("Present Date: "+current_date);//or with label 

    //Previous Date 
    calendar.add(Calendar.MONTH, -1); 
    String previous_date = formatter.format(calendar.getTime()); 
    three_date.add(previous_date);//only date 
    //three_date.add("Previous Date: "+previous_date);//or with label 

    //Future Date 
    calendar.add(Calendar.MONTH, 2); 
    String future_date = formatter.format(calendar.getTime()); 
    three_date.add(future_date);//only date 
    //three_date.add("Next Date: "+future_date);//or with label 

    return three_date; 
} 

}