Android默認的ListView在滾動到頂端或底端，沒有很好的提示，下面通過源碼來實現彈性效果。

ListView中有一個控制滑動到邊緣的處理方法：

protected boolean overScrollBy(int deltaX, int deltaY,int scrollX, int scrollY,int scrollRangeX, int scrollRangeY,int maxOverScrollX, int maxOverScrollY,boolean isTouchEvent)

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其中參數maxOverScrollX---Numbers of piexls to overscroll by in either direction along the Y axis.默認為0，修改這個數值就可以實現滑動到頂端的彈性效果。

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//為滿足多分辨率的需求，通過屏幕的density來計算maxOverScrollY的具體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;//將滑動距離改為50，默認為0，無彈性效果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() {//為滿足多分辨率的需求，通過屏幕的density來計算maxOverScrollY的具體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);} }

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FlexibleListViewTest.java

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package sunny.example.ahfourflexiblelistviewtest; //具有彈性的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 ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data));} }

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flexible.xml

<?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"><sunny.example.ahfourflexiblelistviewtest.FlexibleListViewandroid:id="@+id/flexible_listview"android:layout_width="match_parent"android:layout_height="match_parent" /> </LinearLayout> 創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

總結

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