站长检测工具,一 网站建设总体目标,织梦模板怎么验证网站,找人做网站需要花多少钱Android默认的ListView在滚动到顶端或底端#xff0c;没有很好的提示#xff0c;下面通过源码来实现弹性效果。
ListView中有一个控制滑动到边缘的处理方法#xff1a; protected boolean overScrollBy(int deltaX, int deltaY,int scrollX, int scrollY,int scrollRangeX,…Android默认的ListView在滚动到顶端或底端没有很好的提示下面通过源码来实现弹性效果。
ListView中有一个控制滑动到边缘的处理方法 protected boolean overScrollBy(int deltaX, int deltaY,int scrollX, int scrollY,int scrollRangeX, int scrollRangeY,int maxOverScrollX, int maxOverScrollY,boolean isTouchEvent) 其中参数maxOverScrollX---Numbers of piexls to overscroll by in either direction along the Y axis.默认为0修改这个数值就可以实现滑动到顶端的弹性效果。 //为满足多分辨率的需求通过屏幕的density来计算maxOverScrollY的具体DisplayMetrics metrics mContext.getResources().getDisplayMetrics();float density metrics.density;mMaxOverDistance (int) (density * mMaxOverDistance); 完整的工程
FlexibleListView.java
package sunny.example.ahfourflexiblelistviewtest;import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.widget.ListView;SuppressLint(NewApi)
public class FlexibleListView extends ListView {private static int mMaxOverDistance 50;//将滑动距离改为50默认为0无弹性效果private Context mContext;public FlexibleListView(Context context, AttributeSet attrs,int defStyleAttr) {super(context, attrs, defStyleAttr);this.mContext context;initView();}public FlexibleListView(Context context, AttributeSet attrs) {super(context, attrs);this.mContext context;initView();}public FlexibleListView(Context context) {super(context);this.mContext context;initView();}private void initView() {//为满足多分辨率的需求通过屏幕的density来计算maxOverScrollY的具体DisplayMetrics metrics mContext.getResources().getDisplayMetrics();float density metrics.density;mMaxOverDistance (int) (density * mMaxOverDistance);}Overrideprotected boolean overScrollBy(int deltaX, int deltaY,int scrollX, int scrollY,int scrollRangeX, int scrollRangeY,int maxOverScrollX, int maxOverScrollY,boolean isTouchEvent) {return super.overScrollBy(deltaX, deltaY,scrollX, scrollY,scrollRangeX, scrollRangeY,maxOverScrollX, mMaxOverDistance,isTouchEvent);}
}FlexibleListViewTest.java package sunny.example.ahfourflexiblelistviewtest;
//具有弹性的ListView
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;public class FlexibleListViewTest extends Activity {private FlexibleListView mFlexibleListView;private String[] data new String[30];Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.flexible);for (int i 0; i 30; i) {data[i] i;}mFlexibleListView (FlexibleListView) findViewById(R.id.flexible_listview);mFlexibleListView.setAdapter(new ArrayAdapterString(this,android.R.layout.simple_list_item_1,data));}
}flexible.xml
?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:orientationverticalsunny.example.ahfourflexiblelistviewtest.FlexibleListViewandroid:idid/flexible_listviewandroid:layout_widthmatch_parentandroid:layout_heightmatch_parent /
/LinearLayout
