Carson带你学Android：完美解决ScrollView与嵌套EditText的滑动冲突

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity">

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

            <EditText
                android:id="@+id/mEditText"
                android:layout_width="300dp"
                android:layout_height="300dp"
                android:maxLines="8"
                android:scrollbars="vertical"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="500dp"
                android:text="Android"
                android:textAppearance="?android:attr/textAppearanceLarge" />
        </LinearLayout>
    </ScrollView>
</LinearLayout>

public class MainActivity extends AppCompatActivity {

    ScrollView mScrollView;
    EditText mEditText;

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

        mScrollView = findViewById(R.id.scrollView);
        mEditText = findViewById(R.id.mEditText);
}

public class MainActivity extends AppCompatActivity {

    ScrollView mScrollView;
    EditText mEditText;

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

        mScrollView = findViewById(R.id.scrollView);
        mEditText = findViewById(R.id.mEditText);

        // 复写EditText的onTouch方法
        mEditText.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // 当触摸的是EditText & 当前EditText可滚动时，则将事件交给EditText处理；
                if ((v.getId() == R.id.mEditText && canVerticalScroll(mEditText))) {
                    v.getParent().requestDisallowInterceptTouchEvent(true);
                    // 否则将事件交由其父类处理
                    if (event.getAction() == MotionEvent.ACTION_UP) {
                        v.getParent().requestDisallowInterceptTouchEvent(false);
                    }
                }
                return false;
            }
        });
    }

    // 判断当前EditText是否可滚动
    private boolean canVerticalScroll(EditText editText) {

        if (editText.getLineCount() > editText.getMaxLines()) {
            return true;
        }
        return false;
    }
}