如果我尝试在文本视图中捏合，缩放不起作用

Question

我正在尝试实现捏合以缩放文本视图。如果我将内容宽度和高度保留为换行内容，则缩放和滚动工作正常，即当我在文本视图外进行缩放时，捏合缩放工作正常，但如果在文本视图中完成，则无法正常工作。

我想在文本视图中执行此操作。 即当宽度和高度设置为与父级匹配时。

这是我的代码：

活动代码：

public class sukharta extends Activity {
TextView scaleGesture;
RelativeLayout relative;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sukharta);
scaleGesture = (TextView) findViewById(R.id.article);
scaleGesture.setText(R.string.twentyfive);
relative = (RelativeLayout) findViewById(R.id.sv) ;
// ******Set gesture on your TextView******
relative.setOnTouchListener(new simpleOnScaleGestureListener(this));
}

public class simpleOnScaleGestureListener implements View.OnTouchListener,
ScaleGestureDetector.OnScaleGestureListener {
private ScaleGestureDetector relative;
public simpleOnScaleGestureListener(Context context) {
relative = new ScaleGestureDetector(context, this);
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
// TODO Auto-generated method stub
relative = detector;
float size = scaleGesture.getTextSize();
Log.d("TextSizeStart", String.valueOf(size));
float factor = detector.getScaleFactor();
Log.d("Factor", String.valueOf(factor));

float product = size * factor;
Log.d("TextSize", String.valueOf(product));
scaleGesture.setTextSize(TypedValue.COMPLEX_UNIT_PX, product);
size = scaleGesture.getTextSize();
Log.d("TextSizeEnd", String.valueOf(size));
return true;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
}
@Override
public boolean onTouch(View v, MotionEvent event) {
relative.onTouchEvent(event);
return true;
}
}
}

XML代码：

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/sv">
<TextView
android:id="@+id/article"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
</ScrollView>

Answer 1

你需要修改你的手势，现在你的TextView正在抓住完整的可用空间。所以你必须在TextView上设置手势。

public class sukharta extends Activity {
TextView scaleGesture;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
scaleGesture = (TextView) findViewById(R.id.article);
scaleGesture.setText("25");
scaleGesture.setMovementMethod(new ScrollingMovementMethod());
// ******Set gesture on your TextView******
scaleGesture.setOnTouchListener(new simpleOnScaleGestureListener(this));
}

public class simpleOnScaleGestureListener implements View.OnTouchListener,
ScaleGestureDetector.OnScaleGestureListener {
private ScaleGestureDetector gestureScale;
public simpleOnScaleGestureListener(Context context) {
gestureScale = new ScaleGestureDetector(context, this);
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
// TODO Auto-generated method stub
gestureScale = detector;
float size = scaleGesture.getTextSize();
Log.d("TextSizeStart", String.valueOf(size));
float factor = detector.getScaleFactor();
Log.d("Factor", String.valueOf(factor));

float product = size * factor;
Log.d("TextSize", String.valueOf(product));
scaleGesture.setTextSize(TypedValue.COMPLEX_UNIT_PX, product);
size = scaleGesture.getTextSize();
Log.d("TextSizeEnd", String.valueOf(size));
return true;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
}
@Override
public boolean onTouch(View v, MotionEvent event) {
gestureScale.onTouchEvent(event);
return true;
}
}
}

注意 - 小建议，从大写字符开始你的类名，尽量避免内部类，专注于单一职责类设计。