android仿iphone主题效果的主菜单

现在很多第三方Launcher((如360Launcher,GoLauncher)带有iphone主题，相信玩Android的人大都知道。

本例实现仿iphone主题的launcher的冰山一角。如下图：

从效果看，大概就能猜出用什么控件类（支持左右滑动的控件类+GridView），支持左右滑动的控件类，有很多了比如常用的Gallery,ViewPager,ViewFlipper,ViewFlow等等，本例自定义继承ViewGroup的。看过launcher源码的人应该都知道 有个Workspace类继承ViewGroup实现主菜单的。

闲话不多说了！

主布局:main.xml

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

 <com.xyz.workspace.Workspace
  android:id="@+id/workspace"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" /> 

 <com.xyz.workspace.PageIndicator
  android:id="@+id/indicator"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignParentBottom="true"
  android:layout_centerHorizontal="true"
  android:layout_marginBottom="20dip" /> 

</RelativeLayout>

第一个自定义类Workspace就是实现左右滑动的，第二个类PageIndicator做指示器用。
Workspace.java

package com.xyz.workspace; 

import java.util.List; 

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.Scroller; 

public class Workspace extends ViewGroup { 

 private static final String TAG = "Workspace";
 private Scroller mScroller;
 private VelocityTracker mVelocityTracker; 

 private static final int DEFAULT_SCREEN = 0;
 private static final int TOUCH_STATE_REST = 0;
 private static final int TOUCH_STATE_SCROLLING = 1;
 private static final int SNAP_VELOCITY = 600;
 public static final int APP_PAGE_SIZE = 16; 

 private int mCurScreen;
 private int mTouchState = TOUCH_STATE_REST;
 private int mTouchSlop;
 private float mLastMotionX;
 private float mLastMotionY; 

 private OnViewChangedListener mOnViewChangedListener; 

 public Workspace(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
  // TODO Auto-generated constructor stub
 } 

 public Workspace(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  // TODO Auto-generated constructor stub
  mScroller = new Scroller(context);
  mCurScreen = DEFAULT_SCREEN;
  mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
 } 

 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
  // TODO Auto-generated method stub
  if (changed) {
   int childLeft = 0;
   final int childCount = getChildCount();
   for (int i = 0; i < childCount; i++) {
    final View childView = getChildAt(i);
    if (childView.getVisibility() != View.GONE) {
     final int childWidth = childView.getMeasuredWidth();
     childView.layout(childLeft, 0, childLeft + childWidth,
       childView.getMeasuredHeight());
     childLeft += childWidth;
    }
   }
  }
 } 

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec); 

  final int width = MeasureSpec.getSize(widthMeasureSpec);
  final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
  if (widthMode != MeasureSpec.EXACTLY) {
   throw new IllegalStateException(
     "ScrollLayout only canmCurScreen run at EXACTLY mode!");
  } 

  final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
  if (heightMode != MeasureSpec.EXACTLY) {
   throw new IllegalStateException(
     "ScrollLayout only can run at EXACTLY mode!");
  }
  final int count = getChildCount();
  for (int i = 0; i < count; i++) {
   getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
  }
  scrollTo(mCurScreen * width, 0);
 } 

 public void snapToDestination() {
  final int screenWidth = getWidth();
  final int destScreen = (getScrollX() + screenWidth / 2) / screenWidth;
  snapToScreen(destScreen);
 } 

 public void snapToScreen(int whichScreen) {
  whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
  if (getScrollX() != (whichScreen * getWidth())) {
   final int delta = whichScreen * getWidth() - getScrollX();
   mScroller.startScroll(getScrollX(), 0, delta, 0,
     Math.abs(delta) * 2);
   mCurScreen = whichScreen;
   invalidate();
  }
  if (mOnViewChangedListener != null) {
   mOnViewChangedListener.onChange(getChildCount(), whichScreen);
  }
 } 

 public void setToScreen(int whichScreen) {
  whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
  mCurScreen = whichScreen;
  scrollTo(whichScreen * getWidth(), 0);
 } 

 public int getCurScreen() {
  return mCurScreen;
 } 

 @Override
 public void computeScroll() {
  // TODO Auto-generated method stub
  if (mScroller.computeScrollOffset()) {
   scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
   postInvalidate();
  }
 } 

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  // TODO Auto-generated method stub 

  if (mVelocityTracker == null) {
   mVelocityTracker = VelocityTracker.obtain();
  }
  mVelocityTracker.addMovement(event);
  final int action = event.getAction();
  final float x = event.getX();
  final float y = event.getY();
  switch (action) {
  case MotionEvent.ACTION_DOWN:
   if (!mScroller.isFinished()) {
    mScroller.abortAnimation();
   }
   mLastMotionX = x;
   break;
  case MotionEvent.ACTION_MOVE:
   int deltaX = (int) (mLastMotionX - x);
   mLastMotionX = x;
   scrollBy(deltaX, 0);
   break;
  case MotionEvent.ACTION_UP:
   final VelocityTracker velocityTracker = mVelocityTracker;
   velocityTracker.computeCurrentVelocity(1000);
   int velocityX = (int) velocityTracker.getXVelocity();
   if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
    snapToScreen(mCurScreen - 1);
   } else if (velocityX < -SNAP_VELOCITY
     && mCurScreen < getChildCount() - 1) {
    snapToScreen(mCurScreen + 1);
   } else {
    snapToDestination();
   }
   if (mVelocityTracker != null) {
    mVelocityTracker.recycle();
    mVelocityTracker = null;
   }
   mTouchState = TOUCH_STATE_REST;
   break;
  case MotionEvent.ACTION_CANCEL:
   mTouchState = TOUCH_STATE_REST;
   break;
  }
  return true;
 } 

 @Override
 public boolean onInterceptTouchEvent(MotionEvent ev) {
  // TODO Auto-generated method stub
  final int action = ev.getAction();
  if ((action == MotionEvent.ACTION_MOVE)
    && (mTouchState != TOUCH_STATE_REST)) {
   return true;
  }
  final float x = ev.getX();
  final float y = ev.getY();
  switch (action) {
  case MotionEvent.ACTION_MOVE:
   final int xDiff = (int) Math.abs(mLastMotionX - x);
   if (xDiff > mTouchSlop) {
    mTouchState = TOUCH_STATE_SCROLLING;
   }
   break;
  case MotionEvent.ACTION_DOWN:
   mLastMotionX = x;
   mLastMotionY = y;
   mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST
     : TOUCH_STATE_SCROLLING;
   break;
  case MotionEvent.ACTION_CANCEL:
  case MotionEvent.ACTION_UP:
   mTouchState = TOUCH_STATE_REST;
   break;
  }
  return mTouchState != TOUCH_STATE_REST;
 } 

 public void setOnViewChangedListener(OnViewChangedListener l) {
  mOnViewChangedListener = l;
 } 

 public interface OnViewChangedListener {
  public void onChange(int cnt, int index);
 }
}

PageIndicator.java:

package com.xyz.workspace; 

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout; 

public class PageIndicator extends LinearLayout { 

 private Context mContext; 

 public PageIndicator(Context ctx) {
  super(ctx);
  // TODO Auto-generated constructor stub
  mContext = ctx;
 } 

 public PageIndicator(Context ctx, AttributeSet attrs) {
  super(ctx, attrs);
  // TODO Auto-generated constructor stub
  mContext = ctx;
 } 

 public void setIndication(int cnt, int index) {
  if (index < 0 || index > cnt)
   index = 0;
  removeAllViews();
  for (int i = 0; i < cnt; i++) {
   ImageView iv = new ImageView(mContext);
   iv.setImageResource(index == i ? R.drawable.indicator_current
     : R.drawable.indicator);
   if (i != 0 || i != cnt - 1) {
    iv.setPadding(4, 0, 4, 0);
   }
   addView(iv);
  }
 }
}

这两个类的作用上面已经说了，有什么看不明白的欢迎提问，或自行google。

ViewGroup实现好了，剩下就是实现GridView显示系统所有app，主要工作也就是实现GridView的适配器---GridAdapter

package com.xyz.workspace; 

import java.util.List; 

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import static com.xyz.workspace.Workspace.APP_PAGE_SIZE; 

public class GridAdapter extends BaseAdapter implements OnClickListener { 

 private Context mContext;
 private int mPageIndex;
 private List<ResolveInfo> mPackagesInfo; 

 public GridAdapter(Context context, List<ResolveInfo> listInfo, int page) {
  mContext = context;
  mPackagesInfo = listInfo;
  mPageIndex = page;
 } 

 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  int size = mPackagesInfo.size();
  return size / APP_PAGE_SIZE > 0
    && size - (APP_PAGE_SIZE * (mPageIndex + 1)) > 0 ? APP_PAGE_SIZE
    : size % APP_PAGE_SIZE;
 } 

 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return mPackagesInfo.get(APP_PAGE_SIZE * mPageIndex + position);
 } 

 @Override
 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return position;
 } 

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  // TODO Auto-generated method stub
  if (convertView == null) {
   convertView = new AppItem(mContext, (ResolveInfo) getItem(position));
  }
  convertView.setOnClickListener(this);
  convertView.setTag(Integer.valueOf(position));
  return convertView;
 } 

 /** 点击启动app **/
 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  int pos = (Integer) v.getTag();
  ResolveInfo info = (ResolveInfo) getItem(pos);
  Intent i = new Intent(Intent.ACTION_MAIN);
  i.addCategory(Intent.CATEGORY_LAUNCHER);
  i.setComponent(new ComponentName(info.activityInfo.packageName,
    info.activityInfo.name));
  mContext.startActivity(i);
 }
}

GridView的每个item不用说，一看就知道是一个LinearLayout上面是个ImageView，下面一个TextView了。我把它封装了下---AppItem:

package com.xyz.workspace; 

import android.content.Context;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView; 

public class AppItem extends RelativeLayout { 

 private Context mContext;
 private ImageView mAppIcon;
 private TextView mAppName;
 private ResolveInfo mAppInfo;
 private PackageManager mPackageManager; 

 public AppItem(Context context) {
  super(context);
  mContext = context;
  mPackageManager = context.getPackageManager();
  LayoutInflater.from(context).inflate(R.layout.app_item, this);
  mAppIcon = (ImageView) findViewById(R.id.icon);
  mAppName = (TextView) findViewById(R.id.app_name);
 } 

 public AppItem(Context context, ResolveInfo info) {
  this(context);
  mAppInfo = info;
  show();
 } 

 private void show() {
  String packageName = mAppInfo.activityInfo.packageName;
  String appName = mAppInfo.activityInfo.loadLabel(mPackageManager)
    .toString();
  if (appName.equals("拨号")) {
   mAppIcon.setImageResource(R.drawable.com_android_phone);
  } else if (packageName.equals("com.android.contacts")) {
   mAppIcon.setImageResource(R.drawable.com_android_contacts);
  } else if (packageName.equals("com.android.mms")) {
   mAppIcon.setImageResource(R.drawable.com_android_mms);
  } else if (packageName.equals("com.android.music")) {
   mAppIcon.setImageResource(R.drawable.com_android_music);
  } else if (packageName.equals("com.android.browser")) {
   mAppIcon.setImageResource(R.drawable.com_android_browser);
  } else if (packageName.equals("com.android.settings")) {
   mAppIcon.setImageResource(R.drawable.com_android_settings);
  } else if (packageName.equals("com.android.email")) {
   mAppIcon.setImageResource(R.drawable.com_android_email);
  } else if (packageName.equals("com.android.calendar")) {
   mAppIcon.setImageResource(R.drawable.com_android_calendar);
  } else if (packageName.equals("com.android.calculator2")) {
   mAppIcon.setImageResource(R.drawable.com_android_calculator2);
  } else if (packageName.equals("com.android.deskclock")) {
   mAppIcon.setImageResource(R.drawable.com_android_deskclock);
  } else if (packageName.equals("com.android.camera")) {
   mAppIcon.setImageResource(R.drawable.com_android_camera);
  } else if (packageName.equals("com.android.soundrecorder")) {
   mAppIcon.setImageResource(R.drawable.com_android_soundrecorder);
  } else if (packageName.equals("com.tencent.mobileqq")) {
   mAppIcon.setImageResource(R.drawable.com_tencent_qq);
  } else if (packageName.equals("com.tencent.mm")) {
   mAppIcon.setImageResource(R.drawable.com_tencent_mm);
  } else if (packageName.equals("com.tencent.mtt")) {
   mAppIcon.setImageResource(R.drawable.com_tencent_mtt);
  } else if (packageName.equals("com.sina.weibo")) {
   mAppIcon.setImageResource(R.drawable.com_sina_weibo);
  } else if (packageName.equals("com.sds.android.ttpod")) {
   mAppIcon.setImageResource(R.drawable.com_sds_android_ttpod);
   // ////////////////////////////////////////////////////////////////
  } else if (packageName.equals("com.youdao.dict")) {
   mAppIcon.setImageResource(R.drawable.com_youdao_dict);
  } else {
   mAppIcon.setImageDrawable(getRoundCornerDrawable(mContext,
     mAppInfo.activityInfo.loadIcon(mPackageManager), 20));
  }
  mAppName.setText(appName);
 } 

 private Drawable getRoundCornerDrawable(Context ctx, int resId,
   float roundPX /* <span style="font-size:14px;">圆角半径 </span>*/) {
  return getRoundCornerDrawable(ctx,
    mContext.getResources().getDrawable(resId), roundPX);
 } 

 private Drawable getRoundCornerDrawable(Context ctx, Drawable drawable,
   float roundPX /* <span style="font-size:14px;">圆角半径 </span>*/) {
  int w = ctx.getResources()
    .getDimensionPixelSize(R.dimen.app_icon_width);
  int h = w; 

  Bitmap bitmap = Bitmap
    .createBitmap(
      w,
      h,
      drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
        : Bitmap.Config.RGB_565);
  Canvas canvas = new Canvas(bitmap);
  drawable.setBounds(0, 0, w, h);
  drawable.draw(canvas); 

  int width = bitmap.getWidth();
  int height = bitmap.getHeight();
  Bitmap retBmp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
  Canvas can = new Canvas(retBmp); 

  final int color = 0xff424242;
  final Paint paint = new Paint();
  final Rect rect = new Rect(0, 0, width, height);
  final RectF rectF = new RectF(rect); 

  paint.setColor(color);
  paint.setAntiAlias(true);
  can.drawARGB(0, 0, 0, 0);
  can.drawRoundRect(rectF, roundPX, roundPX, paint); 

  paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
  can.drawBitmap(bitmap, rect, rect, paint);
  return new BitmapDrawable(retBmp);
 }
}

注意咯，show函数就是替换显示对应iphone里app的图标（来源反编译iphone主题的launcher或锁屏），利用 包名 判断是哪个应用再换上对应图标，例如com.android.mms---信息，com.android.contacts---联系人，这里有个疑问，为什么phone模块的package_name的也是com.android.contacts，有人知道么？谢谢啦！
AppItem引用一个布局：
app_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="@dimen/app_icon_width"
 android:layout_height="@dimen/app_icon_height"
 android:gravity="center"
 android:orientation="vertical" > 

 <ImageView
  android:id="@+id/icon"
  android:layout_width="@dimen/app_icon_width"
  android:layout_height="@dimen/app_icon_width"
  android:layout_gravity="center_horizontal" /> 

 <TextView
  android:id="@+id/app_name"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:ellipsize="marquee"
  android:maxWidth="@dimen/app_icon_height"
  android:singleLine="true"
  android:textColor="@android:color/white"
  android:textSize="12sp" /> 

</LinearLayout>

主Activity就是获取所有app信息及初始化界面，
MainActivty.java:

package com.xyz.workspace; 

import java.util.List; 

import com.xyz.workspace.Workspace.OnViewChangedListener; 

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.GridView;
import static com.xyz.workspace.Workspace.APP_PAGE_SIZE; 

public class MainActivity extends Activity implements OnViewChangedListener { 

 private Workspace mWorkspace;
 private PageIndicator mIndicator; 

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main); 

  mWorkspace = (Workspace) findViewById(R.id.workspace);
  mIndicator = (PageIndicator) findViewById(R.id.indicator);
  List<ResolveInfo> apps = loadApps();
  for (int i = 0; i < Math.ceil(1.0f * apps.size() / APP_PAGE_SIZE); i++) {
   GridView grid = new GridView(this);
   grid.setNumColumns(4);
   grid.setHorizontalSpacing(10);
   grid.setVerticalSpacing(40);
   grid.setPadding(30, 50, 30, 20);
   grid.setGravity(Gravity.CENTER);
   grid.setAdapter(new GridAdapter(this, apps, i));
   mWorkspace.addView(grid);
  }
  mWorkspace.setOnViewChangedListener(this);
  mIndicator.setIndication(mWorkspace.getChildCount(), 0);
 } 

 private List<ResolveInfo> loadApps() {
  Intent i = new Intent(Intent.ACTION_MAIN, null);
  i.addCategory(Intent.CATEGORY_LAUNCHER);
  return getPackageManager().queryIntentActivities(i, 0);
 } 

 @Override
 public void onChange(int cnt, int index) {
  // TODO Auto-generated method stub
  mIndicator.setIndication(cnt, index);
 }
}

源码下载：android仿iphone主题之主菜单

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。