Android Moveview滑屏移动视图类完整实例

import android.study.shift.ItemView;
import android.study.shift.MainView;
import android.study.shift.Moveview;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.MeasureSpec;
public class Moveview extends ViewGroup{
 private final static int TOUCH_STATE_REST = 0;
 private final static int TOUCH_STATE_MOVING = 1;
 private final static int MOVE_TO_LEFT = 1;
 //private final static int MOVE_TO_RIGHT = 2;
 private final static int MOVE_TO_REST = 0;
 public final static int MAIN = 0;
 public final static int LEFT = 1;
 public final static int RIGHT = 2;
 private int touch_state = TOUCH_STATE_REST;
 private int move_state = MOVE_TO_REST;
 private int now_state = MAIN;
 private final float WIDTH_RATE = 0.18f;
 private MainView main_show_view;
 private ItemView left_show_view;
 private int min_distance = 30;//此处只是初始化为30 ，其实不起作用
 private int screen_w;
 private int screen_h;
 private int move_x_v;
 private boolean isAimationMoving = false;
 private Handler mHandler = new Handler() {
 public void handleMessage(Message msg) {//处理消息
  synchronized (Moveview.this) {//同步
  isAimationMoving = true;
  int move_change = (int) (screen_w * WIDTH_RATE / 5);
  int left = main_show_view.getView().getLeft();
  if (msg.what == 1) {//主屏在向右拖曳。。。
   move(move_change + left);//参数为拖出来后主屏的坐标。
  }
  if (msg.what == 11) {
   isAimationMoving = false;
   moveToLeft(false); //满足可以显示的要求开始显示，false只是一个判定条件，以区别按钮起的效果
  }
  if (msg.what == 2) {//代表主屏向左在拖曳。。。
   move(-1 * move_change + left);
  }
  if (msg.what == 12) {
   isAimationMoving = false;
   //moveToRight(false);
  }
  if (msg.what == 0) {
   if (now_state == LEFT) {//如果现在已经显示左边
   move(-1 * move_x_v);//那么还原成主屏
   } else {
   move(move_x_v);
   }
  }
  if (msg.what == 10) {
   isAimationMoving = false;
   moveToMain(false);
  }
  }
 }
 };
 public Moveview(Context context) {
 super(context);
 }
 public Moveview(Context context, AttributeSet attrs) {
 super(context, attrs);
 }
 public Moveview(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 }
 public void initView() {
 if (main_show_view == null) {
  main_show_view = new MainView(this.getContext(), this);
  left_show_view = new ItemView(this.getContext());
  //right_show_view = new ItemView(this.getContext(), "aaa");
 }
 this.addView(left_show_view.getView());
 //this.addView(right_show_view.getView());
 this.addView(main_show_view.getView());
 }
 public void initContent() {
 }
 public void move(int start) {//本函数显示拖动的时候屏幕的显示情况。
 int left = main_show_view.getView().getLeft();//left代表主屏左边缘的位置坐标。
 if (now_state == MAIN) {
  if (left > 0) {//如果屏幕的左边被移向右，则left变成正数
  if (move_state != MOVE_TO_LEFT) {
   move_state = MOVE_TO_LEFT;
  }
  left_show_view.getView().setVisibility(View.VISIBLE);//设置左边可见
  //right_show_view.getView().setVisibility(View.GONE);
  } //else if (left < 0) {//如果屏幕的左边被移向左，则left变成负数
  //if (move_state != MOVE_TO_RIGHT) {
  // move_state = MOVE_TO_RIGHT;
  /