its possible to moving textview with accelometer? im trying and get forceclose
slidame4.java
public class Slidame4 extends Activity implements SensorEventListener {
private Bitmap bit,bi,bitm;
private TableRow tblrow ;
private ImageView bimg;
private kotak hitam;
private TextView v ;
private List<kotak> tiles = null;
private List<TileView> tileViews = null;
private List<TableRow> tableRow = null;
private TableLayout tbl;
public int ukurangrid;
private SensorManager sensorManager;
private GameBoard coba;
private int lebar;
private Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Resources r = getResources();
tbl = (TableLayout)findViewById(R.id.TableLayout1);
tblrow = new TableRow(this);
v= new TextView(this);
bimg = new ImageView(this);
//sensor
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this,sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_NORMAL);
//lebar
Display display = getWindowManager().getDefaultDisplay();
lebar = (display.getWidth());
setContentView(R.layout.activity_slidame4);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.slidame4, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case R.id.hint:
Toast.makeText(getApplicationContext(), ""+lebar, Toast.LENGTH_SHORT).show();
break;
case R.id.highscore:
Toast.makeText(getApplicationContext(), "HIGH SCORE ", 3).show();
break;
case R.id.grid3:
ukurangrid = 3;
createGameBoard();
item.setChecked(true);
break;
case R.id.grid4:
ukurangrid = 4;
createGameBoard();
item.setChecked(true);
break;
case R.id.grid5:
ukurangrid = 5;
createGameBoard();
item.setChecked(true);
break;
default:
return super.onOptionsItemSelected(item);
}
return false;
}
private final void createGameBoard() {
TableLayout gLayout;
gLayout = (TableLayout) findViewById(R.id.TableLayout1);
gLayout.removeAllViews();
bi = BitmapFactory.decodeResource(getResources(), R.drawable.gambar);
coba = new GameBoard(this, bi, gLayout, lebar,ukurangrid);
bi.recycle();
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float[] values = event.values;
// Movement
int x = (int)values[0];
int y = (int)values[1];
int z = (int)values[2];
coba.gerak(x, y, z);
}
}
protected void onResume() {
super.onResume();
sensorManager.registerListener(this,sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(this);
}
}
gameboard.java
public class GameBoard extends Activity {
private Bitmap bit;
private int layar,lebar_board,grid,x,y,z;
private Context context;
private GamePiece emptyGamePiece;
private SensorManager sensorManager;
private static GameBoard board=null;
private TableLayout gameLayout;
private List<GamePiece> gamePieces = null;
private List<TableRow> tableRow = null;
GameBoard(Context context, Bitmap bit, TableLayout gLayout,int lebar,int grid) {
this.context =context;
this.lebar_board=lebar;
this.bit = Bitmap.createScaledBitmap(bit, this.lebar_board,
this.lebar_board, true);
this.gameLayout = gLayout;
this.grid=grid;
init();
// TODO Auto-generated constructor stub
}
private void init() {
initializeLists();
createGamePieces();
addToGameScreen();
}
private void initializeLists() {
if (gamePieces == null) {
gamePieces = new ArrayList<GamePiece>(grid*grid);
} else {
for (int i = 0; i < gamePieces.size(); i++) {
gamePieces.get(i).getBitmap().recycle();
gamePieces = new ArrayList<GamePiece>(grid*grid);
}
}
tableRow = new ArrayList<TableRow>(grid);
for (int row = 0; row < (grid*grid); row++) {
tableRow.add(new TableRow(context));
}
}
private void createGamePieces() {
int gamePiece_width = bit.getWidth() / grid;
int gamePiece_height = bit.getHeight() / grid;
for (int row = 0; row < grid; row++) {
for (int column = 0; column < grid; column++) {
Bitmap bitm = Bitmap.createBitmap(bit, column
* gamePiece_width, row * gamePiece_height,
gamePiece_width, gamePiece_height);
if ((row == grid - 1) && (column == grid - 1)) {
bitm = Bitmap.createBitmap(gamePiece_width, gamePiece_height,
bitm.getConfig());
bitm.eraseColor(Color.BLACK);
emptyGamePiece = new GamePiece(context, bitm, row, column,row + "-" + column);
gamePieces.add(emptyGamePiece);
} else {
GamePiece tempGamePiece = new GamePiece(context, bitm, row,
column, row + "-" + column);
gamePieces.add(tempGamePiece);
}
} // end column
}// end row
bit.recycle();
}
public void addToGameScreen() {
TextView cek = new TextView(context);
cek.setText(x+" "+y);
Iterator<GamePiece> it = (shuffleGamePieces()).iterator();
for (int row = 0; row < grid; row++) {
for (int column = 0; column < grid; column++) {
tableRow.get(row).addView(it.next());
} // end column
gameLayout.addView(tableRow.get(row));
} // end row
gameLayout.addView(cek);
}
public List<GamePiece> shuffleGamePieces() {
Collections.shuffle(gamePieces);
gamePieces.remove(emptyGamePiece);
gamePieces.add(emptyGamePiece);
for (int row = 0; row < grid; row++) {
for (int column = 0; column < grid; column++) {
gamePieces.get(grid * row + column).setCurrent(row, column);
}
}
//numberOfMoves = 0;
return gamePieces;
}
public static void createGameBoard(Context context, Bitmap bit,
TableLayout gLayout, int lebar, int grid) {
board = new GameBoard(context,bit,gLayout,lebar,grid);
}
public void gerak(int x,int y,int z){
this.x=x;
this.y=y;
this.z=z;
}
}
in this case gerak(x,y,z) is trying to get value of accelometer and i put in gameboard.java
and got forceclose
logcat
05-18 04:22:43.619: E/AndroidRuntime(27662): java.lang.NullPointerException
05-18 04:22:43.619: E/AndroidRuntime(27662): at skripsi.slidame4.Slidame4.onSensorChanged(Slidame4.java:192)
05-18 04:22:43.619: E/AndroidRuntime(27662): at android.hardware.SystemSensorManager$ListenerDelegate$1.handleMessage(SystemSensorManager.java:204)
05-18 04:22:43.619: E/AndroidRuntime(27662): at android.os.Handler.dispatchMessage(Handler.java:99)
05-18 04:22:43.619: E/AndroidRuntime(27662): at android.os.Looper.loop(Looper.java:137)
05-18 04:22:43.619: E/AndroidRuntime(27662): at android.app.ActivityThread.main(ActivityThread.java:4931)
05-18 04:22:43.619: E/AndroidRuntime(27662): at java.lang.reflect.Method.invokeNative(Native Method)
05-18 04:22:43.619: E/AndroidRuntime(27662): at java.lang.reflect.Method.invoke(Method.java:511)
05-18 04:22:43.619: E/AndroidRuntime(27662): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
Look to your coba variable.
You create it only in the createGameBoard(); method.
This method is called only after you press the menu and select some options.
But, you are registering your SensorListener in the OnCreate method.
Look to your OnSensorChanged method:
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float[] values = event.values;
// Movement
int x = (int)values[0];
int y = (int)values[1];
int z = (int)values[2];
coba.gerak(x, y, z); // Look here.
}
}
If you are registering your SensorListener in the OnCreate, you have it before you create your coba variable. So, this method (OnSensorChanged) can be called before your GameBoard creation.
The OnSensorChanged is called almost every millisecond after the listener is registered.
What are you doing?
Activity Creation -> Sensor Listener Registered -> GameBoard creation
What is really happening?
Activity Creation -> Sensor Listener Registered -> OnSensorChanged called -> GameBoard creation
What you can do?
only check if the GameBoard is created or create a variable to indicate if the game is started.
Alt 1:
@Override
public void onSensorChanged(SensorEvent event) {
if (coba != null && event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float[] values = event.values;
// Movement
int x = (int)values[0];
int y = (int)values[1];
int z = (int)values[2];
coba.gerak(x, y, z);
}
}
Alt 2:
private boolean isGameInitialized = false;
private final void createGameBoard() {
TableLayout gLayout;
gLayout = (TableLayout) findViewById(R.id.TableLayout1);
gLayout.removeAllViews();
bi = BitmapFactory.decodeResource(getResources(), R.drawable.gambar);
coba = new GameBoard(this, bi, gLayout, lebar,ukurangrid);
bi.recycle();
this.isGameInitialized = true;
}
@Override
public void onSensorChanged(SensorEvent event) {
if (this.isGameInitialized && event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float[] values = event.values;
// Movement
int x = (int)values[0];
int y = (int)values[1];
int z = (int)values[2];
coba.gerak(x, y, z);
}
}