HorizontalScrollView的使用演示样例

Posted 2020-09-11 cynchanpin

MainActivity例如以下:

package cc.cv;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.app.Activity;
import android.content.Context;
/**
 * Demo描写叙述:
 * HorizontalScrollView的简单使用
 * 
 * 在Google文档中Gallery已经弃用.推荐使用HorizontalScrollView和ViewPager.
 * ViewPager用过不少,HorizontalScrollView倒是非常少使用.所以在此学习.
 * 
 * Demo说明:
 * 1 布局文件非常easy,在HorizontalScrollView中嵌套了一个LinearLayout
 * 2 在代码中仅仅需将自己定义的View加入到LinearLayout中就可以.
 * 这样就能够实现水平滑动了.
 *
 */
public class MainActivity extends Activity {
	private Context mContext;
	private int [] mPhotosIntArray;
	private LayoutInflater mLayoutInflater;
    private LinearLayout mGalleryLinearLayout;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		initView();
		initData();
	}

	private void initView(){
		mContext=this;
		mGalleryLinearLayout=(LinearLayout) findViewById(R.id.galleryLinearLayout);
		mLayoutInflater=LayoutInflater.from(mContext);
	}
	private void initData(){
		mPhotosIntArray=new int[]{R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d,R.drawable.e,R.drawable.f,R.drawable.g,R.drawable.h};
	    View itemView=null;
	    ImageView imageView=null;
	    TextView textView;
		for (int i = 0; i < mPhotosIntArray.length; i++) {
			itemView=mLayoutInflater.inflate(R.layout.gallery_item, null);
			imageView=(ImageView) itemView.findViewById(R.id.imageView);
			textView=(TextView) itemView.findViewById(R.id.textView);
			imageView.setImageResource(mPhotosIntArray[i]);
			textView.setText("This is "+(i+1));
			mGalleryLinearLayout.addView(itemView);
		}
	}

}

main.xml例如以下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <HorizontalScrollView
        android:layout_width="match_parent"
        android:layout_height="150dip"
        android:layout_centerInParent="true"
        android:scrollbars="horizontal" >

        <LinearLayout
            android:id="@+id/galleryLinearLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:gravity="center_vertical" >
        </LinearLayout>
        
    </HorizontalScrollView>

</RelativeLayout>

gallery_item.xml例如以下:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="80dip"
        android:layout_height="80dip"
        android:layout_centerHorizontal="true" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/imageView"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="8dip" />

</RelativeLayout>