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我想旋转我的位图 img，它是使用一个加速度计轴的汽车转向。我不知道如何将它与矩阵一起使用或在其他类中调用 sensorchanged 方法。我的应用程序处于横向模式，我有两个类，一个用于传感器，一个用于位图。我完全迷路了。

    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) {

        }
    }
}
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2 回答 2

2

在此链接上寻找实际旋转

旋转位图

因此，在 onSensorChanged 方法中，您将根据需要使用所需的 x 或 y 值进行旋转

于 2012-06-03T00:30:21.263 回答
0 
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);
于 2013-04-15T07:14:32.453 回答