今天我们主要实现我们的主界面：国际惯例：
界面我们已经在第一天做好了，今天我们就要实现这个界面的功能，
分析一下，这个界面包含以下几个功能：
1、显示游戏的难度：使用popupwindow，选择后改变显示的数字
2、显示默认的待拼图图片，包含一张选择自定义的图片：这个比较简单，只是GridView的最简单应用而已
3、自定义按钮功能：调用系统图册和相机
4、查看记录和了解更多：这个也是一般的应用需求，比较简单
package com.xys.xpuzzle.activity;import java.io.File;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Color;import android.graphics.drawable.ColorDrawable;import android.graphics.drawable.Drawable;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.PopupWindow;import android.widget.TextView;import com.xys.xpuzzle.R;import com.xys.xpuzzle.adapter.GridPicListAdapter;/** * 程序主界面：显示默认图片列表、自选图片按钮 * * @author xys * */public class MainActivity extends Activity implements OnClickListener {// 返回码：系统图库private static final int RESULT_IMAGE = 100;// 返回码：相机private static final int RESULT_CAMERA = 200;// Temp照片路径public static String TEMP_IMAGE_PATH;// IMAGE TYPEprivate static final String IMAGE_TYPE = "image/*";// GridView 显示图片private GridView gv_Pic_List;private List<Bitmap> picList;// 主页图片资源IDprivate int[] resPicId;// 显示Typeprivate TextView tv_puzzle_main_type_selected;private LayoutInflater layoutInflater;private PopupWindow popupWindow;private View popupView;private TextView tvType2;private TextView tvType3;private TextView tvType4;// 游戏类型N*Nprivate int type = 2;// 本地图册、相机选择private String[] customItems = new String[] { "本地图册", "相机拍照" };@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.xpuzzle_main);TEMP_IMAGE_PATH = Environment.getExternalStorageDirectory().getPath() + "/ttt.jpg";picList = new ArrayList<Bitmap>();// 初始化ViewsinitViews();// 数据适配器gv_Pic_List.setAdapter(new GridPicListAdapter(MainActivity.this, picList));// Item点击监听gv_Pic_List.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) {if (position == resPicId.length – 1) {// 选择本地图库 相机showDialogCustom();} else {// 选择默认图片Intent intent = new Intent(MainActivity.this, PuzzleMain.class);intent.putExtra("picSelectedID", resPicId[position]);intent.putExtra("type", type);startActivity(intent);}}});/** * 显示难度Type */tv_puzzle_main_type_selected.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// 弹出popup windowpopupShow(v);}});}// 显示选择系统图库 相机对话框private void showDialogCustom() {AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);builder.setTitle("选择：");builder.setItems(customItems, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {if (0 == which) {// 本地相册Intent intent = new Intent(Intent.ACTION_PICK, null);intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_TYPE);startActivityForResult(intent, RESULT_IMAGE);} else if (1 == which) {// 系统相机Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);Uri photoUri = Uri.fromFile(new File(TEMP_IMAGE_PATH));intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);startActivityForResult(intent, RESULT_CAMERA);}}});builder.create().show();}/*** 调用图库相机回调方法*/@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (resultCode == RESULT_OK) {if (requestCode == RESULT_IMAGE && data != null) {// 相册Cursor cursor = this.getContentResolver().query(data.getData(), null, null, null, null);cursor.moveToFirst();String imagePath = cursor.getString(cursor.getColumnIndex("_data"));Intent intent = new Intent(MainActivity.this, PuzzleMain.class);intent.putExtra("picPath", imagePath);intent.putExtra("type", type);startActivity(intent);} else if (requestCode == RESULT_CAMERA) {// 相机Intent intent = new Intent(MainActivity.this, PuzzleMain.class);intent.putExtra("picPath", TEMP_IMAGE_PATH);intent.putExtra("type", type);startActivity(intent);}}}/*** 显示popup window** @param view*/private void popupShow(View view) {// 显示popup windowpopupWindow = new PopupWindow(popupView, 200, 50);popupWindow.setFocusable(true);popupWindow.setOutsideTouchable(true);// 透明背景Drawable transpent = new ColorDrawable(Color.TRANSPARENT);popupWindow.setBackgroundDrawable(transpent);// 获取位置int[] location = new int[2];view.getLocationOnScreen(location);popupWindow.showAtLocation(view, Gravity.NO_GRAVITY, location[0] – 40, location[1] + 50);}/*** 初始化Views*/private void initViews() {gv_Pic_List = (GridView) findViewById(R.id.gv_xpuzzle_main_pic_list);// 初始化Bitmap数据resPicId = new int[] { R.drawable.pic1, R.drawable.pic2, R.drawable.pic3, R.drawable.pic4, R.drawable.pic5, R.drawable.pic6, R.drawable.pic7,R.drawable.pic8, R.drawable.pic9, R.drawable.pic10, R.drawable.pic11, R.drawable.pic12, R.drawable.pic13, R.drawable.pic14,R.drawable.pic15, R.drawable.plus };Bitmap[] bitmaps = new Bitmap[resPicId.length];for (int i = 0; i < bitmaps.length; i++) {bitmaps[i] = BitmapFactory.decodeResource(getResources(), resPicId[i]);picList.add(bitmaps[i]);}// 显示typetv_puzzle_main_type_selected = (TextView) findViewById(R.id.tv_puzzle_main_type_selected);layoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);// type viewpopupView = layoutInflater.inflate(R.layout.xpuzzle_main_type_selected, null);tvType2 = (TextView) popupView.findViewById(R.id.tv_main_type_2);tvType3 = (TextView) popupView.findViewById(R.id.tv_main_type_3);tvType4 = (TextView) popupView.findViewById(R.id.tv_main_type_4);// 监听事件tvType2.setOnClickListener(this);tvType3.setOnClickListener(this);tvType4.setOnClickListener(this);}/*** popup window item点击事件*/@Overridepublic void onClick(View v) {switch (v.getId()) {// Typecase R.id.tv_main_type_2:type = 2;tv_puzzle_main_type_selected.setText("2 X 2");break;case R.id.tv_main_type_3:type = 3;tv_puzzle_main_type_selected.setText("3 X 3");break;case R.id.tv_main_type_4:type = 4;tv_puzzle_main_type_selected.setText("4 X 4");break;default:break;}popupWindow.dismiss();}}注释还是比较清晰的，相信大家都看得懂。
下面还有送一个数据适配器：
慢慢学会了长大。流转的时光，
