Question

我想使用一个加速度计轴旋转我的位图img，这是一个汽车转向。我不知道如何在矩阵中使用它或在其他类中调用sensorchanged方法。我的应用程序处于横向模式，我有两个类用于传感器，一个用于位图。我完全迷失了。

    public class CustomDrawableView extends View {

    AnimationSteeringActivity sens = new AnimationSteeringActivity();

    public CustomDrawableView(Context context) {
        // TODO Auto-generated constructor stub

        super(context);

    }

    @Override
    public void onDraw(Canvas canvas) {
        Bitmap bmp = BitmapFactory.decodeResource(getResources(),
                R.drawable.steering);

        int canvasWidth = canvas.getWidth();
        int canvasHeight = canvas.getHeight();
        int bitmapWidth = bmp.getWidth();
        int bitmapHeight = bmp.getHeight();

        int centreX = (canvasWidth - bitmapWidth) / 2;

        int centreY = (canvasWidth - bitmapHeight) / 2;

        canvas.drawColor(Color.WHITE);


        canvas.drawBitmap(bmp, centreX, centreY, null);

和

public class AnimationSteeringActivity extends Activity implements
    SensorEventListener {
/** Called when the activity is first created. */

/** Called when the activity is first created. */
CustomDrawableView mCustomDrawableView = null;
ShapeDrawable mDrawable = new ShapeDrawable();
public static int x;
public static int y;

private SensorManager sensorManager = null;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    // Get a reference to a SensorManager
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    mCustomDrawableView = new CustomDrawableView(this);
    setContentView(mCustomDrawableView);
    // setContentView(R.layout.main);

}

// This method will update the UI on new sensor events
public void onSensorChanged(SensorEvent sensorEvent) {
    {
        if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            // the values you were calculating originally here were over
            // 10000!
            x = (int) Math.pow(sensorEvent.values[1], 2);
            y = (int) Math.pow(sensorEvent.values[2], 2);

        }

        if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) {

        }
    }
}

Answer 1

在此链接中查找实际轮换

rotating a bitmap

所以在onSensorChanged方法中，你将根据你想要的颜色旋转想要的x或y值

Answer 2

Bitmap myBitmap = BitmapFactory.decodeStream(downloadImageFromWeb());

Bitmap myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.android1);

Display d = getWindowManager().getDefaultDisplay();

int x = d.getWidth();

int y = d.getHeight();

ImageView img1 = (ImageView)findViewById(R.id.img1);

Bitmap scaledBitmap = Bitmap.createScaledBitmap(myBitmap, y, x, true);

Matrix matrix = new Matrix();

matrix.postRotate(-90);

Bitmap rotatedBitmap = Bitmap.createBitmap(scaledBitmap , 0, 0, scaledBitmap .getWidth(), scaledBitmap .getHeight(), matrix, true);


img1.setImageBitmap(rotatedBitmap);

Android：如何使用加速度计旋转我的位图？

2 个答案: