Hi to all, i'm new for Android, i want to create a simple application
that move an image to the screen, i read in many forums and i found
the way to do that, i use a custom view in my activity:
private static final String TAG =
DroidzActivity.class.getSimpleName();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
Log.d(TAG, "View added");
}
@Override
protected void onDestroy() {
Log.d(TAG, "Destroying...");
super.onDestroy();
}
@Override
protected void onStop() {
Log.d(TAG, "Stopping...");
super.onStop();
}
public void onClick(View v) {
}
}
the main.xml is:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="1">
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content" android:id="@+id/linearLayout1">
<Button android:text="Restart" android:id="@+id/buttonRestart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
<TextView android:text="-" android:layout_width="wrap_content"
android:id="@+id/textViewPunteggio" android:textAppearance="?
android:attr/textAppearanceLarge"
android:layout_height="wrap_content"></TextView>
</LinearLayout>
<net.obviam.droidz.MainGamePanel
android:layout_height="match_parent" android:id="@+id/mainGamePanel1"
android:layout_width="323dp"></net.obviam.droidz.MainGamePanel>
</LinearLayout>
and my custom view is:
public class MainGamePanel extends SurfaceView implements
SurfaceHolder.Callback {
private static final String TAG =
MainGamePanel.class.getSimpleName();
private MainThread thread;
private Droid droid;
public MainGamePanel(Context context, AttributeSet attr) {
super(context,attr);
// adding the callback (this) to the surface holder to intercept
events
getHolder().addCallback(this);
// create droid and load bitmap
droid = new Droid(BitmapFactory.decodeResource(getResources(),
R.drawable.chicco), 50, 50);
// create the game loop thread
thread = new MainThread(getHolder(), this);
setFocusable(true);
}
public Droid getDroid() {
return droid;
}
public void setDroid(Droid droid) {
this.droid = droid;
}
public void render(Canvas canvas) {
canvas.drawColor(Color.BLACK);
droid.draw(canvas);
}
public void update() {
// check collision with right wall if heading right
if (droid.getSpeed().getxDirection() == Speed.DIRECTION_RIGHT
&& droid.getX() + droid.getBitmap().getWidth()
/ 4 >= getWidth())
{
droid.getSpeed().toggleXDirection();
}
// check collision with left wall if heading left
if (droid.getSpeed().getxDirection() == Speed.DIRECTION_LEFT
&& droid.getX() - droid.getBitmap().getWidth()
/ 4 <= 0) {
droid.getSpeed().toggleXDirection();
}
// check collision with bottom wall if heading down
if (droid.getSpeed().getyDirection() == Speed.DIRECTION_DOWN
&& droid.getY() + droid.getBitmap().getHeight()
/ 4 >=
getHeight()) {
droid.getSpeed().toggleYDirection();
}
// check collision with top wall if heading up
if (droid.getSpeed().getyDirection() == Speed.DIRECTION_UP
&& droid.getY() - droid.getBitmap().getHeight()
/ 4 <= 0) {
droid.getSpeed().toggleYDirection();
}
// Update the lone droid
droid.update();
}
public void surfaceChanged(SurfaceHolder holder, int format, int
width,int height) {
}
public void surfaceCreated(SurfaceHolder holder) {
// at this point the surface is created and
// we can safely start the game loop
thread.setRunning(true);
thread.start();
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.d(TAG, "Surface is being destroyed");
// tell the thread to shut down and wait for it to finish
// this is a clean shutdown
boolean retry = true;
while (retry) {
try {
thread.join();
retry = false;
} catch (InterruptedException e) {
// try again shutting down the thread
}
}
Log.d(TAG, "Thread was shut down cleanly");
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// delegating event handling to the droid
droid.handleActionDown((int) event.getX(), (int)
event.getY());
if (droid.isTouched()) {
score++;
Log.d(TAG, "Punteggio:" + score);
}
}
if (event.getAction() == MotionEvent.ACTION_MOVE) {
// Questo lo utilizzi solo in caso di drag dell dito
(trascina)
// if (droid.isTouched()) {
// droid.setX((int)event.getX());
// droid.setY((int)event.getY());
// }
}
if (event.getAction() == MotionEvent.ACTION_UP) {
// touch was released
if (droid.isTouched()) {
droid.setTouched(false);
}
}
return true;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
@Override
protected void onDraw(Canvas canvas) {
// fills the canvas with black
canvas.drawColor(Color.BLACK);
droid.draw(canvas);
}
}
at this point what is the way to modify the object in main.xml?
es: if i want setText of the label "textViewPunteggio" only when the
image is touched ? i try findViewById(R.id.textViewPunteggio) but it
result null, probably because i am in the subView.
Any help is appreciated.
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