我创建了具有捏缩放，平移和旋转的简单应用。他们工作得很好，但不是你所在位置的轮换。
我使用过Matrix类。
我的活动代码
public class MainActivity extends AppCompatActivity implements View.OnTouchListener {
Matrix saveMatrix = new Matrix();
private ImageView viewImage;
private Button btnCapture;
private static final int RESULT_LOAD_IMAGE = 1;
private static final int REQUEST_IMAGE_CAPTURE = 2;
Matrix matrix = new Matrix();
private Uri mCapturedImageURI;
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
private float d = 0f;
private float newRot = 0f;
private float[] lastEvent = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnCapture = (Button) findViewById(R.id.btnCapture);
viewImage = (ImageView) findViewById(R.id.viewImage);
viewImage.setOnTouchListener(MainActivity.this);
initListerner();
}
public void initListerner() {
btnCapture.setVisibility(View.VISIBLE);
btnCapture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
btnCapture.setVisibility(View.GONE);
final Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.custom_dialog_box);
dialog.setTitle("Title...");
Button dialogButton = (Button) dialog.findViewById(R.id.btnExit);
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
Button btnChoosePath = (Button) dialog.findViewById(R.id.btnChoosePath);
btnChoosePath.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
activeGallery();
dialog.dismiss();
}
});
Button btnTakePhoto = (Button) dialog.findViewById(R.id.btnTakePhoto);
btnTakePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
activeTakePhoto();
dialog.dismiss();
}
});
dialog.show();
}
});
}
@Override
public void onBackPressed() {
super.onBackPressed();
btnCapture.setVisibility(View.VISIBLE);
}
private void activeTakePhoto() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
String fileName = "temp.jpg";
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, fileName);
mCapturedImageURI = getContentResolver()
.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
values);
takePictureIntent
.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
private void activeGallery() {
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, RESULT_LOAD_IMAGE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_LOAD_IMAGE:
if (requestCode == RESULT_LOAD_IMAGE &&
resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver()
.query(selectedImage, filePathColumn, null, null,
null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
viewImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
case REQUEST_IMAGE_CAPTURE:
if (requestCode == REQUEST_IMAGE_CAPTURE &&
resultCode == RESULT_OK) {
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor =
getContentResolver().query(mCapturedImageURI, projection, null,
null, null);
int column_index_data = cursor.getColumnIndexOrThrow(
MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String picturePath = cursor.getString(column_index_data);
cursor.close();
viewImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
}
}
@Override
public boolean onTouch(View v, MotionEvent motionEvent) {
ImageView view = (ImageView) v;
switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
saveMatrix.set(matrix);
start.set(motionEvent.getX(), motionEvent.getY());
mode = DRAG;
lastEvent = null;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(motionEvent);
if (oldDist > 10f) {
saveMatrix.set(matrix);
midPoint(mid, motionEvent);
mode = ZOOM;
}
lastEvent = new float[4];
lastEvent[0] = motionEvent.getX(0);
lastEvent[1] = motionEvent.getX(1);
lastEvent[2] = motionEvent.getY(0);
lastEvent[3] = motionEvent.getY(1);
d = rotation(motionEvent);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
lastEvent = null;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(saveMatrix);
float dx = motionEvent.getX() - start.x;
float dy = motionEvent.getY() - start.y;
matrix.postTranslate(dx, dy);
} else if (mode == ZOOM) {
float newDist = spacing(motionEvent);
if (newDist > 10f) {
matrix.set(saveMatrix);
float scale = (newDist / oldDist);
matrix.postScale(scale, scale, mid.x, mid.y);
}
if (lastEvent != null && motionEvent.getPointerCount() == 2) {
newRot = rotation(motionEvent);
float r = newRot - d;
float[] values = new float[9];
matrix.getValues(values);
float tx = values[2];
float ty = values[5];
float sx = values[0];
float xc = (view.getWidth() / 2) * sx;
float yc = (view.getHeight() / 2) * sx;
matrix.postRotate(r, tx + xc, ty + yc);
}
}
break;
}
view.setImageMatrix(matrix);
return true;
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
private float rotation(MotionEvent event) {
double delta_x = (event.getX(0) - event.getX(1));
double delta_y = (event.getY(0) - event.getY(1));
double radians = Math.atan2(delta_y, delta_x);
return (float) Math.toDegrees(radians);
}
}