我刚开始学习Android开发,我的需求是当应用程序启动时,显示一个空白屏幕。当用户滑动屏幕时,背景颜色应该改变。
我不知道如何实现这个功能。以下是我目前的代码:
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.Menu;
import android.view.MotionEvent;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity implements OnGestureListener {
private LinearLayout main;
private TextView viewA;
private GestureDetector gestureScanner;
@Override
public boolean onTouchEvent(MotionEvent me) {
return gestureScanner.onTouchEvent(me);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public boolean onDown(MotionEvent e) {
viewA.setText("-" + "DOWN" + "-");
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
viewA.setText("-" + "FLING" + "-");
return true;
}
@Override
public void onLongPress(MotionEvent e) {
viewA.setText("-" + "LONG PRESS" + "-");
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
viewA.setText("-" + "SCROLL" + "-");
return true;
}
@Override
public void onShowPress(MotionEvent e) {
viewA.setText("-" + "SHOW PRESS" + "-");
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
viewA.setText("-" + "SINGLE TAP UP" + "-");
return true;
}
public LinearLayout getMain() {
return main;
}
public void setMain(LinearLayout main) {
this.main = main;
}
}