Android 技术博客（1）：上下拉缩小放大图片的 view。

MainActivity.java

package com.matrixxun.zoominlist;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Toast;

import com.matrixxun.starry.PullToZoomListView;

public class MainActivity extends AppCompatActivity {
    private PullToZoomListView listView;
    private String[] adapterData;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (PullToZoomListView)findViewById(R.id.list_view);
        adapterData = new String[] { "Activity","Service","Content Provider","Intent","BroadcastReceiver",
                "ADT","Sqlite3","HttpClient","DDMS","Android Studio","Fragment","Loader",
                "ADT","Sqlite3","HttpClient","DDMS","Android Studio","Fragment","Loader"};

        listView.setAdapter(new ArrayAdapter<>(MainActivity.this,android.R.layout.simple_list_item_1, adapterData));
        listView.getHeaderView().setImageResource(R.drawable.splash);
        listView.getHeaderView().setScaleType(ImageView.ScaleType.CENTER_CROP);
        listView.setShadow(R.drawable.shadow_bottom);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this,"click index:"+position,Toast.LENGTH_SHORT).show();
            }
        });
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <com.matrixxun.starry.PullToZoomListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</RelativeLayout>