How To Repeatedly Update Android Textview To Simulate Animation

I would like the text in a TextView to constantly change once a button in the menu is pressed. Here is my menu's onOptionsItemSelected: public boolean onOptionsItemSelected(MenuIte

Solution 1:

You can use a Handler and a Runnable for your purpose. I'm sharing an edited code which I currently use just like a purpose of yours.

You can directly copy the class and layout, then try it.

Main idea is using a Handler with its post and postDelayed methods with a Runnable. When you pust the button, it start to change text on every 3 seconds. If you push the button again it resets itself.

Try this code, try to understand it. Handlers can be used for many purpose to change UI. Read more about it.

MainActivity.java:

publicclassMainActivityextendsActivity {

    private Handler handler;
    private TextView textView;

    private TextUpdateRunnable textUpdateRunnable;

    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        handler = newHandler();

        textView = (TextView)findViewById(R.id.textView);

        ButtonstartButton= (Button)findViewById(R.id.button);
        startButton.setOnClickListener(newView.OnClickListener() {

            @OverridepublicvoidonClick(View v) {
                if(textUpdateRunnable != null) {
                 handler.removeCallbacks(textUpdateRunnable);
                }
                TextUpdateRunnablenewTextUpdateRunnable=newTextUpdateRunnable(handler, textView); 
                textUpdateRunnable = newTextUpdateRunnable;
                handler.post(textUpdateRunnable);
            }
        });
    }

    privatestaticclassTextUpdateRunnableimplementsRunnable {
        privatestaticfinalintLIMIT=5;

        privateintcount=0;
        private Handler handler;
        private TextView textView;

        publicTextUpdateRunnable(Handler handler, TextView textView) {
            this.handler = handler;
            this.textView = textView;
        }

        publicvoidrun() {
            if(textView != null) {
                textView.setText("here" + count);
                count++;

                if(handler != null && count < LIMIT) {
                    handler.postDelayed(this, 3000);
                }
            }
        }
    };
}

activity_main.xml:

<LinearLayoutxmlns: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:orientation="vertical" ><Buttonandroid:id="@+id/button"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="BUTTON" /><TextViewandroid:id="@+id/textView"android:layout_width="match_parent"android:layout_height="wrap_content" /></LinearLayout>

Solution 2:

See on this answer https://stackoverflow.com/a/3039718/2319589 how to use the Sleep with the Runnable() and implement your code this way.

Should work.

Good luck :)