Android custom control implements display text functionality _android

Android custom control implements display text functionality

Custom control-– Text display

One Goal, one passion!

Objective:

The effect you want to achieve today. Let's show the text one at a time. On the effect chart:

Implementation principle:

1, get the text you want to display.

2, calculate the rate of text display
Font Display speed v = Total font length/total display time

3, the text is displayed on the control according to the rate.

Custom View:

 public class Printtextview extends TextView {/** * font display time * * Private int DURATION = 8000;
  Public Printtextview {This (context, NULL);
  Public Printtextview (context, AttributeSet attrs) {This (context, attrs, 0); Printtextview (context, AttributeSet attrs, int defstyleattr) {Super (context, attrs, defstyleattr)


  ;  public void printstring (String str) {if (str!= null && str!= "") {//length of string final int


      Lenght = Str.length ();
      Final char[] C = new char[str.length ()];
      Converts a string to a character array for (int i = 0; i < str.length (); i++) {C[i] = Str.charat (i);
      } valueanimator animator = valueanimator.offloat (0, 1); Animator.addupdatelistener (New Valueanimator.animatorupdatelistener () {@Override public void Onanimationu Pdate (Valueanimator animation) {//font display speed v = Total font length/Total display time float v = (float) lenGht/(float) DURATION;
          Animation execution speed Float fraction = (float) animation.getanimatedvalue ();

          The number of different stages of the animation the font should display int s = (int) (v * fraction * DURATION);

        SetText (c, 0, s);
      }
      });
      Animator.setduration (DURATION);
    Animator.start ();

 }


  }


  }

Run up:

 public class Scaleactivity extends Appcompatactivity {


  private printtextview print_text;
  String str = "I kiss you Good-bye, in the street of no one." I Kissed you goodbye in the frantic night. This wave gives you 103 points, "+
      " a more tolerant, more patience, more important is a more than a father love. ";

  @Override
  protected void onCreate (Bundle savedinstancestate) {
    super.oncreate (savedinstancestate);
    Setcontentview (R.layout.activity_scale);
    Initview ();
  }




    Print_text = (Printtextview) Findviewbyid (r.id.print_text);
    Print_text.printstring (str);
  }
  

R.layout.activity_scale Layout file

 <?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= "http://schemas.android.com/  Apk/res/android "
  xmlns:tools=" Http://schemas.android.com/tools "
  android:layout_width=" Match_parent "
  android:layout_height= "match_parent"
  android:layout_margin= "20DP"
  android:orientation= "vertical"
  tools:context= "Com.example.customview.activity.ScaleActivity" >
 < Com.example.customview.view.printTextView
    android:id= "@+id/print_text"
    android:layout_width= "Match_ Parent "
    android:layout_height=" wrap_content "
 />
 </LinearLayout>

Ok. Our text is ready to be printed and displayed to the screen.

Thank you for reading, I hope to help you, thank you for your support for this site!