事件分發,以及消除子控制元件和父控制元件互相的影響
阿新 • • 發佈：2018-12-21
效果圖 消除在上下滑的時候讓下面的listview控制元件不進行滑動
如題,先上xml的程式碼 父控制元件listview
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <ListView android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="wrap_content"></ListView> </android.support.constraint.ConstraintLayout>
父控制元件ListView的虛擬內容
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/listview_Name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:text="呵呵呵"></TextView> </LinearLayout>
//圖片的程式碼
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="@mipmap/ic_launcher_round" /> </LinearLayout>
優化後的 自己寫的控制元件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.bwie.administrator.shijian.eliminate.MyViewPage
android:id="@+id/MyHe"
android:layout_width="match_parent"
android:layout_height="200dp"></com.bwie.administrator.shijian.eliminate.MyViewPage>
</LinearLayout>
父控制元件ListView的介面卡
package com.bwie.administrator.shijian.adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.bwie.administrator.shijian.R;
import org.w3c.dom.Text;
import java.util.ArrayList;
public class MyAdapter extends BaseAdapter {
private Context context;
private ArrayList<String> datas;
public MyAdapter(Context context, ArrayList<String> datas) {
this.context = context;
this.datas = datas;
}
@Override
public int getCount() {
return datas.size();
}
@Override
public Object getItem(int position) {
return datas.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//宣告一個holder類
ViewHolder holder = null;
//進行判斷
if (convertView == null){
convertView = View.inflate(context,R.layout.listview_item,null);
holder = new ViewHolder();
holder.tv = convertView.findViewById(R.id.listview_Name);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.tv.setText(datas.get(position));
return convertView;
}
//holder類
class ViewHolder{
TextView tv;
}
}
優化ViewPage的介面卡
package com.bwie.administrator.shijian.adapter;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
public class MyPageAdapter extends PagerAdapter {
private ArrayList<View> lists;
public MyPageAdapter(ArrayList<View> lists) {
this.lists = lists;
}
@Override
public int getCount() {
return lists.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
return view == o;
}
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
container.addView(lists.get(position));
return lists.get(position);
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
//刪除條目檢視
container.removeView(lists.get(position));
}
}
//事件分發消除viewpage和listview之間的影響
package com.bwie.administrator.shijian.eliminate;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewGroup;
/**
* parent.requestDisallowInterceptTouchEvent(true);
* 當我觸控到子控制元件的時候，父控制元件不會影響你
*/
public class MyViewPage extends ViewPager {
private ViewGroup parent;
public MyViewPage(@NonNull Context context) {
super(context);
}
public MyViewPage(Context context, AttributeSet attr) {
super(context, attr);
}
public void setParent(ViewGroup parent) {
this.parent = parent;
}
//
@Override//事件分發
public boolean dispatchTouchEvent(MotionEvent ev) {
//進行判斷
if (parent != null) {
//請求不允許攔截觸控事件
parent.requestDisallowInterceptTouchEvent(true);
}
return super.dispatchTouchEvent(ev);
}
@Override//攔截事件
public boolean onInterceptTouchEvent(MotionEvent ev) {
//進行判斷
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
return super.onInterceptTouchEvent(ev);
}
@Override//消費 處理
public boolean onTouchEvent(MotionEvent ev) {
//進行判斷
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
return super.onTouchEvent(ev);
}
}
MainActivity裡面的程式碼
package com.bwie.administrator.shijian;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import com.bwie.administrator.shijian.adapter.MyAdapter;
import com.bwie.administrator.shijian.adapter.MyPageAdapter;
import com.bwie.administrator.shijian.eliminate.MyViewPage;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ListView listview;
private MyAdapter adapter;
private View myHeaderView;
private MyViewPage myViewPage;
private ArrayList<String> datas = new ArrayList<>();
private ArrayList<View> mPageListList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化資料
initData();
//初始化檢視
initHolderView();
//查詢控制元件
initView();
//設定介面卡
adapter = new MyAdapter(MainActivity.this, datas);
listview.setAdapter(adapter);
}
private void initHolderView() {
myHeaderView = getLayoutInflater().inflate(R.layout.holder_view, null);
myViewPage = myHeaderView.findViewById(R.id.MyHe);
//進行迴圈
for (int i = 0; i < 10; i++) {
View view = getLayoutInflater().inflate(R.layout.page_view, null);
mPageListList.add(view);
}
myViewPage.setParent((ViewGroup) myViewPage.getParent());
//設定介面卡
myViewPage.setAdapter(new MyPageAdapter(mPageListList));
}
//初始化資料
private void initData() {
for (int i = 0; i < 50; i++) {
datas.add("BigFlyRed" + i);
}
}
//查詢控制元件
private void initView() {
listview = (ListView) findViewById(R.id.listview);
listview.addHeaderView(myHeaderView);
}
}
以上;