Android realizes TextView text reflection effect

The key method used here is getDrawingCache() from the View class. This method allows you to capture the current drawing of the view and use it as an image for further manipulation.

Instead of going into too much theory, I wanted to create a real-time clock with a reflection effect. The clock should be dynamic, updating every second. To do this, I first created a custom TextView that displays the time. It’s quite straightforward: retrieve the current time, start a thread that updates the time every second, and then update the TextView accordingly.

To implement this, I created a custom class called TimeView, which extends TextView. This class includes a background thread that runs continuously, sending messages to a handler to update the displayed time.

Here is the code for the TimeView class:

Package com.alex.reflecttextview;

Import java.util.Calendar;

Import android.content.Context;

Import android.os.Handler;

Import android.os.Message;

Import android.text.format.DateFormat;

Import android.util.AttributeSet;

Import android.widget.TextView;

Public class TimeView extends TextView {

Private static final int MESSAGE_TIME = 1;

Public TimeView(Context context, AttributeSet attrs) {

Super(context, attrs);

New TimeThread().start();

}

Public class TimeThread extends Thread {

@Override

Public void run() {

Do {

Try {

Message msg = new Message();

msg.what = MESSAGE_TIME;

mHandler.sendMessage(msg);

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

} while (true);

}

}

Private Handler mHandler = new Handler() {

@Override

Public void handleMessage(Message msg) {

super.handleMessage(msg);

Switch (msg.what) {

Case MESSAGE_TIME:

setTime();

Break;

Default:

Break;

}

}

};

Public void setTime() {

Long sysTime = System.currentTimeMillis();

Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(sysTime);

String sysTimeStr = DateFormat.format("hh:mm", sysTime).toString();

If(calendar.get(Calendar.AM_PM) == 0) {

sysTimeStr += " AM";

} else {

sysTimeStr += " PM";

}

setText(sysTimeStr.replace("1", "1"));

}

}

Once the time is displayed, the next step is to add the reflection effect. This involves capturing the drawing cache of the TextView, flipping it vertically, and drawing it beneath the original text. The reflection can also be made semi-transparent to give it a more realistic look.

This approach gives a smooth and visually appealing effect, especially when combined with animations or transitions. It's a great way to enhance user experience in Android applications by adding subtle visual effects without overcomplicating the UI.

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