Android realizes TextView text reflection effect

The key method used here is getDrawingCache() from the View class, which captures the current drawing of the view into a bitmap and allows us to draw it again. This is essential for creating the reflection effect.

Instead of getting stuck in theory, I wanted to build a real-time clock with a reflection effect. First, I created a custom TextView that displays the current time and updates every second. This part is straightforward — we can use a Handler and a separate thread to update the time periodically.

To implement this, I extended the TextView class and added a background thread that runs continuously. Every second, it sends a message to the main thread to update the displayed time. Below 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"));

}

}

This class provides a simple but effective way to display the current time in a custom TextView. Now, the next step is to add the reflection effect using the getDrawingCache() method. We can take the bitmap of the original text and draw it again, flipped vertically to create the illusion of a mirror image below the original text.

By combining this technique with the time-updating functionality, we can create a visually appealing and interactive UI element that reflects the current time in a unique way. This approach not only demonstrates Android's drawing capabilities but also shows how to combine multiple features to build more complex and engaging user interfaces.

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