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本篇内容主要讲解“Android的ListView怎么使用”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Android的ListView怎么使用”吧!
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在Android开发 中,经常会要用到水平水平ListView(HorizontalListView),但是,Android 官方并没有提供这样一个控件, 所以在这里我给大家分享一下我在项目中用到的一个水平水平ListView,非常好用, 使用过程 中与 ListView 是一样的, 实例化组件, 设置数据,设置Adaper.
package com.example.horizontallistview.hl.widget; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.widget.AdapterView; import android.widget.ListAdapter; public abstract class HorizontalListView extends AdapterView{ public HorizontalListView(Context context) { super(context); } public HorizontalListView(Context context, AttributeSet attrs) { super(context, attrs); } public HorizontalListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public abstract int getScreenPositionForView(View view); /** * Interface definition for a callback to be invoked when an item in this * view has been clicked and held. */ public interface OnItemDragListener { /** * Callback method to be invoked when an item in this view has been * dragged outside the vertical tolerance area. * * Implementers can call getItemAtPosition(position) if they need to * access the data associated with the selected item. * * @param parent * The AbsListView where the click happened * @param view * The view within the AbsListView that was clicked * @param position * The position of the view in the list * @param id * The row id of the item that was clicked * * @return true if the callback consumed the long click, false otherwise */ boolean onItemStartDrag(AdapterView parent, View view, int position, long id); } public interface OnLayoutChangeListener { void onLayoutChange(boolean changed, int left, int top, int right, int bottom); } public interface OnScrollFinishedListener { /** * Callback method to be invoked when the scroll has completed. * * @param currentX * The current scroll position of the view */ void onScrollFinished(int currentX); } }
为什么要继承AdapterView, 大家可以去看看Android提供的ListView是怎么实现的,
public class ListView extends AbsListView
public abstract class AbsListView extends AdapterViewimplements TextWatcher, ViewTreeObserver.OnGlobalLayoutListener, Filter.FilterListener, ViewTreeObserver.OnTouchModeChangeListener, RemoteViewsAdapter.RemoteAdapterConnectionCallback {
大家 对比去看看官方文档实现 ListView的类就知道了.这里我就不再多说了
大家 注意 HorizontalListView只是 一个抽象类, 所以我们不能直接用它,需要用一个类来实现里面的方法
public class HorizontalVariableListView extends HorizontalListView implements
OnGestureListener, FlingRunnableView {
public enum SelectionMode {
Single, Multiple
};
public interface OnItemClickedListener {
/**
* Callback method to be invoked when an item in this AdapterView has
* been clicked.
*
* Implementers can call getItemAtPosition(position) if they need to
* access the data associated with the selected item.
*
* @param parent
* The AdapterView where the click happened.
* @param view
* The view within the AdapterView that was clicked (this
* will be a view provided by the adapter)
* @param position
* The position of the view in the adapter.
* @param id
* The row id of the item that was clicked.
* @return if the implementation return false, then the selection will
* not be updated
*/
boolean onItemClick(AdapterView parent, View view, int position,
long id);
}
public static final int OVER_SCROLL_ALWAYS = 0;
public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1;
public static final int OVER_SCROLL_NEVER = 2;
protected static final String LOG_TAG = "horizontal-variable-list";
private static final float WIDTH_THRESHOLD = 1.1f;
protected int mAlignMode = Gravity.CENTER;
protected SparseBooleanArray mSelectedPositions = new SparseBooleanArray();
protected int mHeight = 0;
protected int mPaddingTop = 0;
protected int mPaddingBottom = 0;
protected ListAdapter mAdapter;
private int mAdapterItemCount;
private int mLeftViewIndex = -1;
private int mRightViewIndex = 0;
private GestureDetector mGesture;
private List> mRecycleBin;
private List mChildWidths = new ArrayList();
private List mChildHeights = new ArrayList();
private boolean mDataChanged = false;
private IFlingRunnable mFlingRunnable;
private boolean mForceLayout;
private int mDragTolerance = 0;
private boolean mDragScrollEnabled;
protected EdgeGlow mEdgeGlowLeft, mEdgeGlowRight;
private int mOverScrollMode = OVER_SCROLL_NEVER;
private Matrix mEdgeMatrix = new Matrix();
private ScrollNotifier mScrollNotifier;
private SelectionMode mChoiceMode = SelectionMode.Single;
private OnItemSelectedListener mOnItemSelected;
private OnItemClickedListener mOnItemClicked;
private OnItemDragListener mItemDragListener;
private OnScrollChangedListener mScrollListener;
private OnScrollFinishedListener mScrollFinishedListener;
private OnLayoutChangeListener mLayoutChangeListener;
public void setOnItemDragListener(OnItemDragListener listener) {
mItemDragListener = listener;
}
public void setOnScrollListener(OnScrollChangedListener listener) {
mScrollListener = listener;
}
public void setOnLayoutChangeListener(OnLayoutChangeListener listener) {
mLayoutChangeListener = listener;
}
public void setOnScrollFinishedListener(OnScrollFinishedListener listener) {
mScrollFinishedListener = listener;
}
public OnItemDragListener getOnItemDragListener() {
return mItemDragListener;
}
/**
* Controls how selection is managed within the list.
当然了 , 这个类很复杂,就不把代码贴出来了, 在下面我们把这个demo代码上传的, 希望大家可以去下载,研究,然后把代码整合到自己的项目中使用.
package com.example.horizontallistview;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import com.example.horizontallistview.hl.widget.HorizontalVariableListView;
import com.example.horizontallistview.hl.widget.HorizontalVariableListView.OnItemClickedListener;
public class MainActivity extends Activity {
private HorizontalVariableListView lv;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (HorizontalVariableListView) findViewById(R.id.lv_horizontal);
String[] items = new String[20];
adapter = new MyAdapter(this, items);
lv.setAdapter(adapter);
lv.setSelectionMode(HorizontalVariableListView.SelectionMode.Single);
lv.setOnItemClickedListener(new OnItemClickedListener() {
@Override
public boolean onItemClick(AdapterView parent, View view, int position,
long id) {
// 水平ListView的点击item事件
Toast.makeText(MainActivity.this, position + "", 1).show();
return false;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}在Activity中就是这么使用这个控件就行了, 是不是很简单,与Listview是一样的用法
我再把activity_main.xml文件代码贴出来