dialog.show() crashes my application, why?
- by user1739462
I'm new in adroid.
I like to do things when the color reach a value. I like (for example) show the alert if r is bigger than 30, but the application go in crash. Thank for very simple answares.
public class MainActivity extends Activity {
private AlertDialog dialog;
private AlertDialog.Builder builder;
private BackgroundColors view;
public class BackgroundColors extends SurfaceView implements Runnable {
public int grand=0;
public int step=0;
private boolean flip=true;
private Thread thread;
private boolean running;
private SurfaceHolder holder;
public BackgroundColors(Context context) {
super(context);
}
Inside this loop while running is true. is impossible to show dialogs ??
public void run() {
int r = 0;
while (running){
if (holder.getSurface().isValid()){
Canvas canvas = holder.lockCanvas();
if (r > 250)
r = 0;
r += 10;
if (r>30 && flip){
flip=false;
// *********************************
dialog.show();
// *********************************
// CRASH !!
}
try {
Thread.sleep(300);
}
catch(InterruptedException e) {
e.printStackTrace();
}
canvas.drawARGB(255, r, 255, 255);
holder.unlockCanvasAndPost(canvas);
}
}
}
public void start() {
running = true;
thread = new Thread(this);
holder = this.getHolder();
thread.start();
}
public void stop() {
running = false;
boolean retry = true;
while (retry){
try {
thread.join();
retry = false;
}
catch(InterruptedException e) {
retry = true;
}
}
}
public boolean onTouchEvent(MotionEvent e){
dialog.show();
return false;
}
protected void onSizeChanged(int xNew, int yNew, int xOld, int yOld){
super.onSizeChanged(xNew, yNew, xOld, yOld);
grand = xNew;
step =grand/15;
}
}
public void onCreate(Bundle b) {
super.onCreate(b);
view = new BackgroundColors(this);
this.setContentView(view);
builder = new AlertDialog.Builder(this);
builder.setMessage("ciao");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.d("Basic", "It worked");
}
});
dialog = builder.create();
}
public void onPause(){
super.onPause();
view.stop();
}
public void onResume(){
super.onResume();
view.start();
}
}
