完美解决EditText和ScrollView的滚动冲突（上）

<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="match_parent">


 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="vertical">

 <TextView
 android:layout_width="match_parent"
 android:layout_height="300dp"
 android:text="Hello World Begin!"/>


 <EditText
 android:id="@+id/edit_text"
 android:hint="EditText"
 android:layout_width="match_parent"
 android:layout_height="200dp"
 android:gravity="top"
 android:background="@drawable/rectangle_shape"/>

 <TextView
 android:layout_width="match_parent"
 android:layout_height="300dp"
 android:text="Hello World End!"/>
 </LinearLayout>

</ScrollView>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
 <solid android:color="#ffffff"/>
 <stroke android:color="#cccccc"
 android:width="1dp"/>

</shape>

public class MainActivity extends Activity implements View.OnTouchListener {

  private EditText mEditText;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mEditText = (EditText) findViewById(R.id.edit_text);
    mEditText.setOnTouchListener(this);
  }

  @Override
  public boolean onTouch(View view, MotionEvent motionEvent) {
    //触摸的是EditText并且当前EditText可以滚动则将事件交给EditText处理；否则将事件交由其父类处理
    if ((view.getId() == R.id.edit_text && canVerticalScroll(mEditText))) {
      view.getParent().requestDisallowInterceptTouchEvent(true);
      if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
        view.getParent().requestDisallowInterceptTouchEvent(false);
      }
    }
    return false;
  }

  /**
   * EditText竖直方向是否可以滚动
   * @param editText 需要判断的EditText
   * @return true：可以滚动  false：不可以滚动
   */
  private boolean canVerticalScroll(EditText editText) {
    //滚动的距离
    int scrollY = editText.getScrollY();
    //控件内容的总高度
    int scrollRange = editText.getLayout().getHeight();
    //控件实际显示的高度
    int scrollExtent = editText.getHeight() - editText.getCompoundPaddingTop() -editText.getCompoundPaddingBottom();
    //控件内容总高度与实际显示高度的差值
    int scrollDifference = scrollRange - scrollExtent;

    if(scrollDifference == 0) {
      return false;
    }

    return (scrollY > 0) || (scrollY < scrollDifference - 1);
  }
}