子控件抢占父控件事件响应

墨蓝 2022-06-08 05:56 484阅读 0赞

### 1.在普通布局中，父控件中含有button、ImageButton、CheckBox、EditText，RatingBar等时，点击事件失效。 ###

例如：列表中的item布局中含有RatingBar子控件。

在item的根布局文件中加入：android:descendantFocusability=”blocksDescendants”

**descendantFocusability属性**

android:descendantFocusability

该属性是当一个为view获取焦点时，定义viewGroup和其子控件两者之间的关系。  
属性的值有三种：  
beforeDescendants：viewgroup会优先其子类控件而获取到焦点  
afterDescendants：viewgroup只有当其子类控件不需要获取焦点时才获取焦点  
blocksDescendants：viewgroup会覆盖子类控件而直接获得焦点

### 2.自定义组合控件中含有button、ImageButton、CheckBox、EditText，RatingBar等时，使自定义的组合控件点击事件失效。而响应子view的事件 ###

在自定义view中重写onInterceptTouchEvent（）方法，它会在事件传给孩子之前被调用。从而实现事件分配不到给子View时就将事件拦截下来。

例如自定义FrameLayout布局，布局中含有一个TextView和一个EditText。通过判断自定义属性isContentFocus来判断是否响EditText的事件。如果传过来的值是true，那么就相应EditText事件不响应自定义布局事件，如果传过来的值是false,那么取消EditText事件响应实现自定义布局的事件响应。

**自定义SettingItemView组合控件继承FrameLayout**

public class SettingItemView extends FrameLayout{ 
        private static final String TAG = "ZCN=SettingItemView";
        private EditText etMsg;
        private TextView tvTitle;
    
        private static final int DEFAULT_TEXT_COLOR = Color.BLACK;
        private static final int DEFAULT_EDIT_COLOR = Color.TRANSPARENT;
        private String titleText;
        private float titleSize;
        private int titleColor;
        private boolean isTitleHide;
        private float contentSize;
        private int contentColor;
        private int contentHintColor;
        private String contentText;
        private boolean isContentFocus;
        private int contentLength;
        private int inputType;
    
        private int DEFAULT_TITLE_SIZE = 16;
        private int DEFAULT_TITLE_COLOR = Color.GRAY;
        private boolean DEFAULT_TITLE_HIDE = false;
        private int DEFAULT_CONTENT_SIZE = 16;
        private int DEFAULT_CONTENT_COLOR = Color.BLACK;
        private int DEFAULT_CONTENT_HINT_COLOR = Color.GRAY;
        private boolean DEFAULT_CONTENT_FOCUS = true;
        private int DEFAULT_CONTENT_LENGTH = 20;
    
        public SettingItemView(Context context, AttributeSet attrs) {
            super(context, attrs);
    
            initAttrs(context, attrs);
    
            initView(context);
        }
    
        private void initAttrs(Context context, AttributeSet attrs) {
            Log.d(TAG,"=====initAttrs=====");
            TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.SettingItemView);
            titleText = typedArray.getString(R.styleable.SettingItemView_title_text);
            titleSize =  typedArray.getDimension(R.styleable.SettingItemView_title_size, DEFAULT_TITLE_SIZE);
            titleColor = typedArray.getColor(R.styleable.SettingItemView_title_color, DEFAULT_TITLE_COLOR);
            isTitleHide = typedArray.getBoolean(R.styleable.SettingItemView_title_hide, DEFAULT_TITLE_HIDE);
            contentText = typedArray.getString(R.styleable.SettingItemView_content_text);
            contentSize =  typedArray.getDimension(R.styleable.SettingItemView_content_size, DEFAULT_CONTENT_SIZE);
            contentColor = typedArray.getColor(R.styleable.SettingItemView_content_color, DEFAULT_CONTENT_COLOR);
            contentHintColor = typedArray.getColor(R.styleable.SettingItemView_content_hint_color, DEFAULT_CONTENT_HINT_COLOR);
            isContentFocus = typedArray.getBoolean(R.styleable.SettingItemView_content_focus, DEFAULT_CONTENT_FOCUS);
            contentLength = typedArray.getInteger(R.styleable.SettingItemView_content_length,DEFAULT_CONTENT_LENGTH);
            inputType = typedArray.getInteger(R.styleable.SettingItemView_content_input_type,1);
            typedArray.recycle();
        }
    
        private void initView(Context context) {
            Log.d(TAG,"=====initView=====");
            LayoutInflater.from(context).inflate(R.layout.view_setting_item, this);// 加载布局
            etMsg = (EditText) findViewById(R.id.et_setting_item);// 获取控件
            tvTitle = (TextView) findViewById(R.id.tv_setting_item);
    
            tvTitle.setText(titleText);
            tvTitle.setTextSize(TypedValue.COMPLEX_UNIT_SP,titleSize);
            //如果不设置这个文字会变得非常大
            tvTitle.getPaint().setTextSize(titleSize);
            tvTitle.setTextColor(titleColor);
            if(isTitleHide){
                tvTitle.setVisibility(GONE);
            }
    
            etMsg.setText(contentText);
            etMsg.setTextSize(TypedValue.COMPLEX_UNIT_SP,contentSize);
            //如果不设置这个文字会变得非常大
            etMsg.getPaint().setTextSize(contentSize);
            etMsg.setTextColor(contentColor);
            etMsg.setHintTextColor(contentHintColor);
            etMsg.setFilters(new InputFilter[]{
       new InputFilter.LengthFilter(contentLength)});
            etMsg.setInputType(inputType);
            if(!isContentFocus){
                etMsg.setFocusable(false);
                etMsg.setClickable(false);
            }
        }
    
        @Override
        public boolean onInterceptTouchEvent(MotionEvent ev) {
            Log.d(TAG,"=====onInterceptTouchEvent=====");
    
            //如果editText传过来放弃焦点的值，那么layout截取事件并响应事件
            return !isContentFocus;
        }
    
        //设置EditText值
        public void setContentText(String str){
            etMsg.setText(str);
        }
    
        //获取EditText值
        public String getContentText(){
            return etMsg.getText().toString().trim();
        }
    
    }

**attrs.xml文件**

<?xml version="1.0" encoding="utf-8"?>
    <resources>
        <declare-styleable name="SettingItemView">
            <attr name="title_text" format="string"/>
            <attr name="title_color" format="color"/>
            <attr name="title_size" format="dimension"/>
            <attr name="title_hide" format="boolean"/>
            <attr name="content_text" format="string"/>
            <attr name="content_size" format="dimension"/>
            <attr name="content_color" format="color"/>
            <attr name="content_length" format="integer"/>
            <attr name="content_input_type" format="integer"/>
            <attr name="content_hint_color" format="color"/>
            <attr name="content_focus" format="boolean"/>
        </declare-styleable>
    </resources>

**view\_setting\_item.xml布局**

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">
        <EditText android:id="@+id/et_setting_item" android:layout_width="match_parent" android:layout_height="48dp" android:background="@android:color/transparent" android:singleLine="true" android:gravity="center"/>
        <TextView android:id="@+id/tv_setting_item" android:layout_width="wrap_content" android:layout_height="48dp" android:gravity="center_vertical" android:layout_marginLeft="16dp"/>
    
    </FrameLayout>

**在布局中使用自定义View**

<com.sdlj.vehiclerepair.view.SettingItemView android:id="@+id/siv_setting_name" style="@style/setting_setting_item_view" android:layout_marginBottom="@dimen/setting_gap_view_height" android:layout_marginTop="@dimen/setting_gap_view_height" app:title_text="@string/setting_name" app:content_focus="false" />