Friday, March 23, 2012

How to make the scrollable TextView in android?



public class MainActivity extends Activity {
/** Called when the activity is first created. */

private TextView mTextView;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.textView1);
mTextView
.setText("this is for testing \nthis is for testing \nthis is for testing \nthis is for testing \nthis is for testing \nthis is for testing \n");

mTextView.setMovementMethod(new ScrollingMovementMethod() {
public void onTakeFocus(TextView widget, Spannable text, int dir) {

}

@Override
public boolean onKeyDown(TextView widget, Spannable buffer,
int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_DOWN:
for (int i = 0, scrollAmount = getScrollAmount(widget); i < scrollAmount; i++) {
down(widget, buffer);
}
return true;
case KeyEvent.KEYCODE_DPAD_UP:
for (int i = 0, scrollAmount = getScrollAmount(widget); i < scrollAmount; i++) {
up(widget, buffer);
}
return true;
default:
return super.onKeyDown(widget, buffer, keyCode, event);
}
}
private int getScrollAmount(TextView widget) {
final int visibleLineCount = (int) ((1f * widget.getHeight()) / widget
.getLineHeight());
int scrollAmount = visibleLineCount - 1;
if (scrollAmount < 1) {
scrollAmount = 1;
}
return scrollAmount;
}
});
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_DOWN:

return true;
case KeyEvent.KEYCODE_DPAD_UP:
mTextView.dispatchKeyEvent(event);
return true;
default:
return super.onKeyDown(keyCode, event);
}
}
}


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