Android 圖片的瀏覽、縮放、拖動和自動居中

大家可以先去了解下Android Matrix基礎+詳解。

 

Touch.java

/**
 * 圖片瀏覽、縮放、拖動、自動居中
 */
public class Touch extends Activity implements OnTouchListener {

    Matrix matrix = new Matrix();
    Matrix savedMatrix = new Matrix();
    DisplayMetrics dm;
    ImageView imgView;
    Bitmap bitmap;

    float minScaleR;// 最小縮放比例
    static final float MAX_SCALE = 4f;// 最大縮放比例

    static final int NONE = 0;// 初始狀態
    static final int DRAG = 1;// 拖動
    static final int ZOOM = 2;// 縮放
    int mode = NONE;

    PointF prev = new PointF();
    PointF mid = new PointF();
    float dist = 1f;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.scale);
        imgView = (ImageView) findViewById(R.id.imag);// 獲取控件
        bitmap = BitmapFactory.decodeResource(getResources(), this.getIntent()
                .getExtras().getInt("IMG"));// 獲取圖片資源
        imgView.setImageBitmap(bitmap);// 填充控件
        imgView.setOnTouchListener(this);// 設置觸屏監聽
        dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);// 獲取分辨率
        minZoom();
        center();
        imgView.setImageMatrix(matrix);
    }

    /**
     * 觸屏監聽
     */
    public boolean onTouch(View v, MotionEvent event) {

        switch (event.getAction() & MotionEvent.ACTION_MASK) {
        // 主點按下
        case MotionEvent.ACTION_DOWN:
            savedMatrix.set(matrix);
            prev.set(event.getX(), event.getY());
            mode = DRAG;
            break;
        // 副點按下
        case MotionEvent.ACTION_POINTER_DOWN:
            dist = spacing(event);
            // 如果連續兩點距離大於10，則判定為多點模式
            if (spacing(event) > 10f) {
                savedMatrix.set(matrix);
                midPoint(mid, event);
                mode = ZOOM;
            }
            break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_POINTER_UP:
            mode = NONE;
            break;
        case MotionEvent.ACTION_MOVE:
            if (mode == DRAG) {
                matrix.set(savedMatrix);
                matrix.postTranslate(event.getX() - prev.x, event.getY()
                        - prev.y);
            } else if (mode == ZOOM) {
                float newDist = spacing(event);
                if (newDist > 10f) {
                    matrix.set(savedMatrix);
                    float tScale = newDist / dist;
                    matrix.postScale(tScale, tScale, mid.x, mid.y);
                }
            }
            break;
        }
        imgView.setImageMatrix(matrix);
        CheckView();
        return true;
    }

    /**
     * 限制最大最小縮放比例，自動居中
     */
    private void CheckView() {
        float p[] = new float[9];
        matrix.getValues(p);
        if (mode == ZOOM) {
            if (p[0] < minScaleR) {
                matrix.setScale(minScaleR, minScaleR);
            }
            if (p[0] > MAX_SCALE) {
                matrix.set(savedMatrix);
            }
        }
        center();
    }

    /**
     * 最小縮放比例，最大為100%
     */
    private void minZoom() {
        minScaleR = Math.min(
                (float) dm.widthPixels / (float) bitmap.getWidth(),
                (float) dm.heightPixels / (float) bitmap.getHeight());
        if (minScaleR < 1.0) {
            matrix.postScale(minScaleR, minScaleR);
        }
    }

    private void center() {
        center(true, true);
    }

    /**
     * 橫向、縱向居中
     */
    protected void center(boolean horizontal, boolean vertical) {

        Matrix m = new Matrix();
        m.set(matrix);
        RectF rect = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());
        m.mapRect(rect);

        float height = rect.height();
        float width = rect.width();

        float deltaX = 0, deltaY = 0;

        if (vertical) {
            // 圖片小於屏幕大小，則居中顯示。大於屏幕，上方留空則往上移，下方留空則往下移
            int screenHeight = dm.heightPixels;
            if (height < screenHeight) {
                deltaY = (screenHeight - height) / 2 - rect.top;
            } else if (rect.top > 0) {
                deltaY = -rect.top;
            } else if (rect.bottom < screenHeight) {
                deltaY = imgView.getHeight() - rect.bottom;
            }
        }

        if (horizontal) {
            int screenWidth = dm.widthPixels;
            if (width < screenWidth) {
                deltaX = (screenWidth - width) / 2 - rect.left;
            } else if (rect.left > 0) {
                deltaX = -rect.left;
            } else if (rect.right < screenWidth) {
                deltaX = screenWidth - rect.right;
            }
        }
        matrix.postTranslate(deltaX, deltaY);
    }

    /**
     * 兩點的距離
     */
    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);
    }

    /**
     * 兩點的中點
     */
    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);
    }
}

 

scale.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center" >

    <ImageView
        android:id="@+id/imag"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:scaleType="matrix" >
    </ImageView>

</FrameLayout>