网格视图GridView的应用

[YXTS122]

MainActivity.java

package com.example.gridview;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.GridView;

public class MainActivity extends Activity {
    private GridView gv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		gv=(GridView)findViewById(R.id.gridviewone);
		gv.setNumColumns(3);
		gv.setAdapter(new MyAdapter(this));
	}

	@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;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}
  

MyAdapter.java

package com.example.gridview;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class MyAdapter extends BaseAdapter{
	private int[] imgs={R.drawable.abc_ab_bottom_solid_dark_holo,
			R.drawable.abc_ab_bottom_solid_light_holo,
			R.drawable.abc_ab_bottom_transparent_dark_holo,
			R.drawable.abc_ab_bottom_transparent_light_holo,
			R.drawable.abc_ab_share_pack_holo_dark,
			R.drawable.abc_ab_share_pack_holo_light,
			R.drawable.abc_ab_solid_dark_holo,
			R.drawable.abc_ab_solid_light_holo,
			R.drawable.abc_ab_stacked_solid_dark_holo,
	};
	
	Context context;
	
	MyAdapter(Context context)
	{
		this.context=context;
	}
	public int getCount()
	{
		return imgs.length;
	}
	public Object getItem(int position)
	{
		return position;
	}
	public long getItemId(int position)
	{
		return position;
	}
	
	public View getView(int position,View convertView,ViewGroup parent)
	{
		ImageView imageView;
		if (convertView==null)
		{
			imageView=new ImageView(context);
			imageView.setLayoutParams(new GridView.LayoutParams(125,125));
			imageView.setAdjustViewBounds(false);
			imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
			imageView.setPadding(8, 8, 8, 8);
		}
		else
		{
			imageView=(ImageView)convertView;
		}
		imageView.setImageResource(imgs[position]);
		return imageView;
	}

}
  

activity_main.xml

<LinearLayout 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"
    tools:context="com.example.gridview.MainActivity"
    android:orientation="vertical" >

    <GridView
        android:id="@+id/gridviewone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
        
    </GridView>

</LinearLayout>