Question

我想通过使用搜索条和＆amp ;;创建放大输入效果。我也希望这个效果使用触摸...触摸放大输入功能工作正常，但我怎么能使用搜索栏实现这种效果...提前感谢...这里我的代码是...

public class MainActivity extends ActionBarActivity implements OnTouchListener {
private static final String TAG = "Touch";
@SuppressWarnings("unused")
private static final float MIN_ZOOM = 1f, MAX_ZOOM = 1f;
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
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;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ImageView view = (ImageView) findViewById(R.id.textImage);
    view.setOnTouchListener(this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    ImageView view = (ImageView) v;
    view.setScaleType(ImageView.ScaleType.MATRIX);
    float scale;
    dumpEvent(event);
    // Handle touch events here...

    switch (event.getAction() & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: // first finger down only
        savedMatrix.set(matrix);
        start.set(event.getX(), event.getY());
        Log.d(TAG, "mode=DRAG"); // write to LogCat
        mode = DRAG;
        break;

    case MotionEvent.ACTION_UP: // first finger lifted

    case MotionEvent.ACTION_POINTER_UP: // second finger lifted

        mode = NONE;
        Log.d(TAG, "mode=NONE");
        break;

    case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down

        oldDist = spacing(event);
        Log.d(TAG, "oldDist=" + oldDist);
        if (oldDist > 5f) {
            savedMatrix.set(matrix);
            midPoint(mid, event);
            mode = ZOOM;
            Log.d(TAG, "mode=ZOOM");
        }
        break;

    case MotionEvent.ACTION_MOVE:

        if (mode == DRAG) {
            matrix.set(savedMatrix);
            matrix.postTranslate(event.getX() - start.x, event.getY()
                    - start.y); // create the transformation in the matrix
                                // of points
        } else if (mode == ZOOM) {
            // pinch zooming
            float newDist = spacing(event);
            Log.d(TAG, "newDist=" + newDist);
            if (newDist > 5f) {
                matrix.set(savedMatrix);
                scale = newDist / oldDist; // setting the scaling of the
                                            // matrix...if scale > 1 means
                                            // zoom in...if scale < 1 means
                                            // zoom out
                matrix.postScale(scale, scale, mid.x, mid.y);
            }
        }
        break;
    }

    view.setImageMatrix(matrix); // display the transformation on screen

    return true; // indicate event was handled

}

private float spacing(MotionEvent event) {
    float x = event.getX(0) - event.getX(1);
    float y = event.getY(0) - event.getY(1);
    return FloatMath.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 void dumpEvent(MotionEvent event) {
    String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
            "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
    StringBuilder sb = new StringBuilder();
    int action = event.getAction();
    int actionCode = action & MotionEvent.ACTION_MASK;
    sb.append("event ACTION_").append(names[actionCode]);

    if (actionCode == MotionEvent.ACTION_POINTER_DOWN
            || actionCode == MotionEvent.ACTION_POINTER_UP) {
        sb.append("(pid ").append(
                action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
        sb.append(")");
    }

    sb.append("[");
    for (int i = 0; i < event.getPointerCount(); i++) {
        sb.append("#").append(i);
        sb.append("(pid ").append(event.getPointerId(i));
        sb.append(")=").append((int) event.getX(i));
        sb.append(",").append((int) event.getY(i));
        if (i + 1 < event.getPointerCount())
            sb.append(";");
    }

    sb.append("]");
    Log.d("Touch Events ---------", sb.toString());
}

}

Answer 1

请检查我的代码。它会对你有所帮助。矩阵矩阵;

Matrix matrix;       
seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar arg0) {
            // TODO Auto-generated method stub


            }


        }

        @Override
        public void onStartTrackingTouch(SeekBar arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProgressChanged(SeekBar arg0, int dis, boolean arg2) {
            // TODO Auto-generated method stub

           matrix.postScale(scale, scale, mid.x, mid.y);
            view.setImageMatrix(matrix); 
        }
    });

Answer 2

我有一个很好的代码，可以帮助您使用搜索栏进行放大和缩小

您需要在初始化seekbar之后将其添加到seekbar

  simpleSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                                      boolean fromUser) {
            // TODO Auto-generated method stub
            Log.d(TAG, "progress:" + progress);
            if (camera.getParameters().isZoomSupported()) {
                Camera.Parameters params = camera.getParameters();
                int maxZoom = params.getMaxZoom();
                int zoom = params.getZoom();
                simpleSeekBar.setMax(maxZoom);
                //zoom in
                if (zoom < maxZoom)
                    zoom++;
                //zoom out
                if (zoom > 0)
                    zoom--;
                params.setZoom(progress);
                camera.setParameters(params);
            }
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
            Log.d(TAG, "onStartTrackingTouch");
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
            Log.d(TAG, "onStartTrackingTouch");
        }

    });

我希望它将帮助您享受生活

放大缩小效果在android中使用搜索栏

2 个答案: