滚动和缩放Textview之间的冲突

Question

我在使用Textview时遇到了一些问题。我已经为我的应用编写了这段代码。如果有必要，我希望能够捏一下以缩放和滚动Textview。我编写了用于缩放的代码，它可以正常工作，但是如果我为textview的滚动插入代码，则它不起作用，但是滚动可以正常工作。如果删除滚动代码，则可以进行缩放，但是如果文本对于页面而言太长，则无法滚动。我的代码有什么问题？

布局代码：

<TextView
        android:id="@+id/tv_testo_canzone"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="40dp"
        android:layout_marginTop="90dp"
        android:scrollbars="vertical"
        android:text="TextView"
        android:textAlignment="center"
        android:textSize="18sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

主要代码：

tv_testo_canzone = (TextView) findViewById(R.id.tv_testo_canzone);
        tv_titolo = (TextView) findViewById(R.id.tv_titolo_canz);
        tv_artista = (TextView) findViewById(R.id.tv_artista_canz);

        tv_testo_canzone.setMovementMethod(new ScrollingMovementMethod());
linearLayout1 = (RelativeLayout) findViewById(R.id.layout_canzone);

        try {
            reader = new BufferedReader(
                    new InputStreamReader(getAssets().open(nomeTxt)));

            // do reading, usually loop until end of file reading
            String mLine;
            while ((mLine = reader.readLine()) != null) {
                text.append(mLine);
                text.append('\n');
            }
        } catch (IOException e) {
            Toast.makeText(getApplicationContext(),"Error reading file!",Toast.LENGTH_LONG).show();
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    //log the exception
                }
            }

            tv_testo_canzone.setText((CharSequence) text);

        }

Answer 1

代码没有错，使用ScrollView时认为所有子视图都不会收到手势，因为它们都由父ScrollView处理

Answer 2

    description.setOnTouchListener((v, event) -> {
        // TODO Auto-generated method stub
        if (event.getPointerCount() == 1) {
            Log.d("Scroll", "1-pointer touch");
            v.getParent().requestDisallowInterceptTouchEvent(false);

        }
        if (event.getPointerCount() == 2) {
            Log.d("Zoom", "2-pointer touch");
            int action = event.getAction();
            int mainaction = action & MotionEvent.ACTION_MASK;
            if (mainaction == MotionEvent.ACTION_POINTER_DOWN) {
                mBaseDist = getDistance(event);
                mBaseRatio = mRatio;
            } else {
                float scale = (getDistance(event) - mBaseDist) / STEP;
                float factor = (float) Math.pow(2, scale);
                mRatio = Math.min(1024.0f, Math.max(0.1f, mBaseRatio * factor));
                description.setTextSize(mRatio + 15);
            }
            v.getParent().requestDisallowInterceptTouchEvent(true);

        }
        return true;
    });

}

private int getDistance(MotionEvent event) {
    int dx = (int) (event.getX(0) - event.getX(1));
    int dy = (int) (event.getY(0) - event.getY(1));
    return (int) (Math.sqrt(dx * dx + dy * dy));
}