可以用accelometer移动textview吗？ 即时尝试并获得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;
}
}
在这种情况下gerak(x,y,z)试图获得accelometer的值，我放入gameboard.java
并得到forceclose
logcat的
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)
答案 0 :(得分：0)
查看您的coba变量。
您只能使用createGameBoard();方法创建它。
只有在按下菜单并选择一些选项后才会调用此方法。
但是，您要在SensorListener方法中注册OnCreate。
查看您的OnSensorChanged方法：
@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.
}
}
如果您在OnCreate中注册SensorListener，则在之前创建coba变量。因此，在创建GameBoard之前，可以将此方法（OnSensorChanged）称为 。
在监听器注册后，几乎每毫秒都会调用OnSensorChanged。
你在做什么？
活动创建 - ＆gt;传感器监听器已注册 - ＆gt; GameBoard创作
真正发生了什么？
活动创建 - ＆gt;传感器监听器已注册 - ＆gt; OnSensorChanged名为 - ＆gt; GameBoard创作
你可以做什么？
仅检查是否已创建GameBoard或创建变量以指示游戏是否已启动。
替补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);
}
}
替补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);
}
}