Question

我有一个以LinearLayout作为主要布局的活动。在该布局中，有一个按钮可以将View（R.layout.motor_block）添加到主布局（R.id.layout）：

    LayoutInflater inflater =
    (LayoutInflater)this.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
    View iv = inflater.inflate( R.layout.motor_block, null );
    RelativeLayout rl = (RelativeLayout) findViewById(R.id.layout);
    rl.addView(iv);

这很好用，但是当我添加更多视图时，屏幕会被填满，所以我需要一种方法来通过添加平移来“扩展”大小，这样我就可以浏览所有视图。我还想添加缩放。

我尝试使用WebView：

       RelativeLayout rl = (RelativeLayout) findViewById(R.id.layout);
   WebView wv = (WebView) findViewById(R.id.webView1);
   wv.getSettings().setSupportZoom(true);  
   wv.getSettings().setBuiltInZoomControls(true);
   wv.getSettings().setUseWideViewPort(true);
   wv.getSettings().setLoadWithOverviewMode(true);
   wv.getSettings().setDisplayZoomControls(false);
   wv.getSettings().setDefaultZoom(WebSettings.ZoomDensity.FAR);
   wv.addView(iv);

视图被添加到它，并且平移工作。问题是当我缩放时，webView会缩放背景，而视图不会改变大小。

我也尝试过一些自定义视图，但他们不支持带有子视图的视图。

实现这一目标的最佳方法是什么？

Answer 1

只是一个例子。在主容器视图上使用setTranslationX / Y和setScaleX / Y.它的孩子会随之扩展和翻译。

public class MainActivity extends Activity {

    private RelativeLayout mainLayout;
    private ScaleGestureDetector scaleGestureDetector;
    private float scale = 1;
    private PointF touchPoint;
    private PointF pan;

    private boolean isScaling;
    private boolean endScalingNextUp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mainLayout = (RelativeLayout) findViewById(id.main_layout);
        scaleGestureDetector = new ScaleGestureDetector(this, new ExampleScaleGestureListener());
        Button b = ((Button) findViewById(id.btn_reset));
        b.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                reset();
            }
        });
        reset();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        scaleGestureDetector.onTouchEvent(event);

        if (scale != 1 && !isScaling) {
            float x = event.getRawX();
            float y = event.getRawY();
            if (event.getAction() == MotionEvent.ACTION_DOWN) {
                touchPoint = new PointF(x, y);
            } else if (event.getAction() == MotionEvent.ACTION_MOVE && touchPoint != null) {
                pan.x = x - touchPoint.x;
                pan.y = y - touchPoint.y;
                panView();
            }
        }
        if (isScaling && endScalingNextUp) {
            if (event.getAction() == MotionEvent.ACTION_POINTER_UP) {
                endScalingNextUp = false;
                isScaling = false;
            }
        }

        return true;
    }

    private void setPivot(float focusX, float focusY) {
        mainLayout.setPivotX(focusX);
        mainLayout.setPivotY(focusY);
    }

    private void scaleView() {
        mainLayout.setScaleX(scale);
        mainLayout.setScaleY(scale);
    }

    private void panView() {
        mainLayout.setTranslationX(pan.x);
        mainLayout.setTranslationY(pan.y);
    }

    private void reset() {
        setPivot(0, 0);
        scale = 1;
        scaleView();
        pan = new PointF(0, 0);
        panView();
        isScaling = false;
    }

    private class ExampleScaleGestureListener implements OnScaleGestureListener {

        private static final float SCALE_SPEED = .02f;

        @Override
        public void onScaleEnd(ScaleGestureDetector detector) {
            endScalingNextUp = true;
        }

        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {
            float focusX = detector.getFocusX();
            float focusY = detector.getFocusY();
            setPivot(focusX, focusY);
            isScaling = true;
            endScalingNextUp = false;
            return true;
        }

        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            isScaling = true;
            endScalingNextUp = false;
            if (detector.getScaleFactor() < 1) {
                scale -= SCALE_SPEED;
            } else if (detector.getScaleFactor() > 1) {
                scale += SCALE_SPEED;
            }
            scaleView();
            return true;
        }
    }
}


    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:id="@+id/main_layout"
        tools:context=".MainActivity" >

        <TextView
            android:id="@+id/tv"
            android:layout_centerInParent="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/hello_world" />

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@+id/tv"
            android:layout_marginBottom="69dp"
            android:layout_marginRight="29dp"
            android:layout_toLeftOf="@+id/tv"
            android:src="@drawable/ic_launcher" />

        <Button
            android:id="@+id/btn_reset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tv"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="22dp"
            android:text="Reset" />

    </RelativeLayout>

Answer 2

最简单的方法是在ScrollView中添加所有这些视图。然后，您可以将ScrollView添加到HorizontalScrollView中以在两个方向上滚动。有一个用于捏合和缩放手势的手势，并为他们打电话给听众。对于缩放，您可以通过运行循环或可能使用ScaleGestureDetector来增加每个视图的大小这种方法有点不稳定，但有效。请查看以下答案以获取更多信息 - Implementing Pan and Zoom

<强>更新： -

这里有更多的答案 -
How to implement zoom effect for image view in android?
android pinch zoom

捏缩放和平移

2 个答案: