今天是2013年的最后一天了，这里首先提前祝大家新年快乐！同时，本篇文章也是我今年的最后一篇文章了，因此我想要让它尽量有点特殊性，比起平时的文章要多一些特色。记得在今年年初的时候，我写的第一篇文章是模仿360手机卫士的桌面悬浮窗效果，那么为了能够首尾呼应，今年的最后一篇文章就同样还是来实现桌面悬浮窗的效果吧，当然效果将会更加高级。
相信用过QQ手机管家的朋友们都会知道它有一个小火箭加速的功能，将小火箭拖动到火箭发射台上发射就会出现一个火箭升空的动画，那么今天我们就来模仿着实现一下这个效果吧。
这次我们将代码的重点放在火箭升空的效果上，因此简单起见，就直接在模仿360手机卫士悬浮窗的那份代码的基础上继续开发了，如果你还没有看过那篇文章的话，建议先去阅读 Android桌面悬浮窗效果实现，仿360手机卫士悬浮窗效果 。
比起普通的桌面悬浮窗，现在我们需要在拖动悬浮窗的时候将悬浮窗变成一个小火箭，并且在屏幕的底部添加一个火箭发射台。那么我们就从火箭发射台开始编写吧。
首先创建launcher.xml作为火箭发射台的布局文件
如下所示：
可以看到，这里的ImageView是用于显示当前火箭发射台状态的。我事先准备好了两张图片，一张是当小火箭未拖动到火箭发射台时显示的，一张是当小火箭拖动到火箭发射台上时显示的。
接下来创建RocketLauncher类，作为火箭发射台的View
代码如下所示：
public class RocketLauncher extends LinearLayout {
public static int width;
public static int height;
private ImageView launcherImg;
public RocketLauncher(Context context) {
super(context);
LayoutInflater.from(context).inflate(R.layout.launcher, this);
launcherImg = (ImageView) findViewById(R.id.launcher_img);
width = launcherImg.getLayoutParams().width;
height = launcherImg.getLayoutParams().height;
}
public void updateLauncherStatus(boolean isReadyToLaunch) {
if (isReadyToLaunch) {
launcherImg.setImageResource(R.drawable.launcher_bg_fire);
} else {
launcherImg.setImageResource(R.drawable.launcher_bg_hold);
}
}
}
RocketLauncher中的代码还是非常简单的，在构建方法中调用了LayoutInflater的inflate()方法来将launcher.xml这个布局文件加载进来，并获取到了当前View的宽度和高度。在updateLauncherStatus()方法中会进行判断，如果传入的参数是true，就显示小火箭即将发射的图片，如果传入的是false，就显示将小火箭拖动到发射台的图片。
新增的文件只有这两个，剩下的就是要修改之前的代码了。首先修改MyWindowManager中的代码，如下所示：
public class MyWindowManager {
private static FloatWindowSmallView smallWindow;
private static FloatWindowBigView bigWindow;
private static RocketLauncher rocketLauncher;
private static LayoutParams smallWindowParams;
private static LayoutParams bigWindowParams;
private static LayoutParams launcherParams;
private static WindowManager mWindowManager;
private static ActivityManager mActivityManager;
public static void createSmallWindow(Context context) {
WindowManager windowManager = getWindowManager(context);
int screenWidth = windowManager.getDefaultDisplay().getWidth();
int screenHeight = windowManager.getDefaultDisplay().getHeight();
if (smallWindow == null) {
smallWindow = new FloatWindowSmallView(context);
if (smallWindowParams == null) {
smallWindowParams = new LayoutParams();
smallWindowParams.type = LayoutParams.TYPE_SYSTEM_alert;
smallWindowParams.format = PixelFormat.RGBA_8888;
smallWindowParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
| LayoutParams.FLAG_NOT_FOCUSABLE;
smallWindowParams.gravity = Gravity.LEFT | Gravity.TOP;
smallWindowParams.width = FloatWindowSmallView.windowViewWidth;
smallWindowParams.height = FloatWindowSmallView.windowViewHeight;
smallWindowParams.x = screenWidth;
smallWindowParams.y = screenHeight / 2;
}
smallWindow.setParams(smallWindowParams);
windowManager.addView(smallWindow, smallWindowParams);
}
}
public static void removeSmallWindow(Context context) {
if (smallWindow != null) {
WindowManager windowManager = getWindowManager(context);
windowManager.removeView(smallWindow);
smallWindow = null;
}
}
public static void createBigWindow(Context context) {
WindowManager windowManager = getWindowManager(context);
int screenWidth = windowManager.getDefaultDisplay().getWidth();
int screenHeight = windowManager.getDefaultDisplay().getHeight();
if (bigWindow == null) {
bigWindow = new FloatWindowBigView(context);
if (bigWindowParams == null) {
bigWindowParams = new LayoutParams();
bigWindowParams.x = screenWidth / 2
- FloatWindowBigView.viewWidth / 2;
bigWindowParams.y = screenHeight / 2
- FloatWindowBigView.viewHeight / 2;
bigWindowParams.type = LayoutParams.TYPE_PHONE;
bigWindowParams.format = PixelFormat.RGBA_8888;
bigWindowParams.gravity = Gravity.LEFT | Gravity.TOP;
bigWindowParams.width = FloatWindowBigView.viewWidth;
bigWindowParams.height = FloatWindowBigView.viewHeight;
}
windowManager.addView(bigWindow, bigWindowParams);
}
}
public static void removeBigWindow(Context context) {
if (bigWindow != null) {
WindowManager windowManager = getWindowManager(context);
windowManager.removeView(bigWindow);
bigWindow = null;
}
}
public static void createLauncher(Context context) {
WindowManager windowManager = getWindowManager(context);
int screenWidth = windowManager.getDefaultDisplay().getWidth();
int screenHeight = windowManager.getDefaultDisplay().getHeight();
if (rocketLauncher == null) {
rocketLauncher = new RocketLauncher(context);
if (launcherParams == null) {
launcherParams = new LayoutParams();
launcherParams.x = screenWidth / 2 - RocketLauncher.width / 2;
launcherParams.y = screenHeight - RocketLauncher.height;
launcherParams.type = LayoutParams.TYPE_PHONE;
launcherParams.format = PixelFormat.RGBA_8888;
launcherParams.gravity = Gravity.LEFT | Gravity.TOP;
launcherParams.width = RocketLauncher.width;
launcherParams.height = RocketLauncher.height;
}
windowManager.addView(rocketLauncher, launcherParams);
}
}
public static void removeLauncher(Context context) {
if (rocketLauncher != null) {
WindowManager windowManager = getWindowManager(context);
windowManager.removeView(rocketLauncher);
rocketLauncher = null;
}
}
public static void updateLauncher() {
if (rocketLauncher != null) {
rocketLauncher.updateLauncherStatus(isReadyToLaunch());
}
}
public static void updateUsedPercent(Context context) {
if (smallWindow != null) {
TextView percentView = (TextView) smallWindow
.findViewById(R.id.percent);
percentView.setText(getUsedPercentValue(context));
}
}
public static boolean isWindowShowing() {
return smallWindow != null || bigWindow != null;
}
public static boolean isReadyToLaunch() {
if ((smallWindowParams.x > launcherParams.x && smallWindowParams.x
+ smallWindowParams.width < launcherParams.x
+ launcherParams.width)
&& (smallWindowParams.y + smallWindowParams.height > launcherParams.y)) {
return true;
}
return false;
}
private static WindowManager getWindowManager(Context context) {
if (mWindowManager == null) {
mWindowManager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
}
return mWindowManager;
}
private static ActivityManager getActivityManager(Context context) {
if (mActivityManager == null) {
mActivityManager = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
}
return mActivityManager;
}
public static String getUsedPercentValue(Context context) {
String dir = "/proc/meminfo";
try {
FileReader fr = new FileReader(dir);
BufferedReader br = new BufferedReader(fr, 2048);
String memoryLine = br.readLine();
String subMemoryLine = memoryLine.substring(memoryLine
.indexOf("MemTotal:"));
br.close();
long totalMemorySize = Integer.parseInt(subMemoryLine.replaceAll(
"\D+", ""));
long availableSize = getAvailableMemory(context) / 1024;
int percent = (int) ((totalMemorySize - availableSize)
/ (float) totalMemorySize * 100);
return percent + "%";
} catch (IOException e) {
e.printStackTrace();
}
return "悬浮窗";
}
private static long getAvailableMemory(Context context) {
ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
getActivityManager(context).getMemoryInfo(mi);
return mi.availMem;
}
}
MyWindowManager是所有桌面悬浮窗的管理器，这里我们主要添加了createLauncher()、removeLauncher()和updateLauncher()这几个方法，分别用于创建、移除、以及更新火箭发射台悬浮窗。另外还添加了isReadyToLaunch()这个方法，它是用于判断小火箭是否已经拖动到火箭发射台上了。判断的方式当然也很简单，只需要对小火箭的边界和火箭发射台的边界进行检测，判断它们是否相交就行了。
接下来还需要修改FloatWindowSmallView中的代码，当手指拖动悬浮窗的时候要将它变成小火箭，如下所示：
public class FloatWindowSmallView extends LinearLayout {
public static int windowViewWidth;
public static int windowViewHeight;
private static int statusBarHeight;
private WindowManager windowManager;
private LinearLayout smallWindowLayout;
private ImageView rocketImg;
private WindowManager.LayoutParams mParams;
private float xInScreen;
private float yInScreen;
private float xDownInScreen;
private float yDownInScreen;
private float xInView;
private float yInView;
private int rocketWidth;
private int rocketHeight;
private boolean isPressed;
public FloatWindowSmallView(Context context) {
super(context);
windowManager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
LayoutInflater.from(context).inflate(R.layout.float_window_small, this);
smallWindowLayout = (LinearLayout) findViewById(R.id.small_window_layout);
windowViewWidth = smallWindowLayout.getLayoutParams().width;
windowViewHeight = smallWindowLayout.getLayoutParams().height;
rocketImg = (ImageView) findViewById(R.id.rocket_img);
rocketWidth = rocketImg.getLayoutParams().width;
rocketHeight = rocketImg.getLayoutParams().height;
TextView percentView = (TextView) findViewById(R.id.percent);
percentView.setText(MyWindowManager.getUsedPercentValue(context));
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isPressed = true;
// 手指按下时记录必要数据,纵坐标的值都需要减去状态栏高度
xInView = event.getX();
yInView = event.getY();
xDownInScreen = event.getRawX();
yDownInScreen = event.getRawY() - getStatusBarHeight();
xInScreen = event.getRawX();
yInScreen = event.getRawY() - getStatusBarHeight();
break;
case MotionEvent.ACTION_MOVE:
xInScreen = event.getRawX();
yInScreen = event.getRawY() - getStatusBarHeight();
// 手指移动的时候更新小悬浮窗的状态和位置
updateViewStatus();
updateViewPosition();
break;
case MotionEvent.ACTION_UP:
isPressed = false;
if (MyWindowManager.isReadyToLaunch()) {
launchRocket();
} else {
updateViewStatus();
// 如果手指离开屏幕时，xDownInScreen和xInScreen相等，且yDownInScreen和yInScreen相等，则视为触发了单击事件。
if (xDownInScreen == xInScreen && yDownInScreen == yInScreen) {
openBigWindow();
}
}
break;
default:
break;
}
return true;
}
public void setParams(WindowManager.LayoutParams params) {
mParams = params;
}
private void launchRocket() {
MyWindowManager.removeLauncher(getContext());
new LaunchTask().execute();
}
private void updateViewPosition() {
mParams.x = (int) (xInScreen - xInView);
mParams.y = (int) (yInScreen - yInView);
windowManager.updateViewLayout(this, mParams);
MyWindowManager.updateLauncher();
}
private void updateViewStatus() {
if (isPressed && rocketImg.getVisibility() != View.VISIBLE) {
mParams.width = rocketWidth;
mParams.height = rocketHeight;
windowManager.updateViewLayout(this, mParams);
smallWindowLayout.setVisibility(View.GONE);
rocketImg.setVisibility(View.VISIBLE);
MyWindowManager.createLauncher(getContext());
} else if (!isPressed) {
mParams.width = windowViewWidth;
mParams.height = windowViewHeight;
windowManager.updateViewLayout(this, mParams);
smallWindowLayout.setVisibility(View.VISIBLE);
rocketImg.setVisibility(View.GONE);
MyWindowManager.removeLauncher(getContext());
}
}
private void openBigWindow() {
MyWindowManager.createBigWindow(getContext());
MyWindowManager.removeSmallWindow(getContext());
}
private int getStatusBarHeight() {
if (statusBarHeight == 0) {
try {
Class c = Class.forName("com.android.internal.R$dimen");
Object o = c.newInstance();
Field field = c.getField("status_bar_height");
int x = (Integer) field.get(o);
statusBarHeight = getResources().getDimensionPixelSize(x);
} catch (Exception e) {
e.printStackTrace();
}
}
return statusBarHeight;
}
class LaunchTask extends AsyncTask {
@Override
protected Void doInBackground(Void... params) {
// 在这里对小火箭的位置进行改变，从而产生火箭升空的效果
while (mParams.y > 0) {
mParams.y = mParams.y - 10;
publishProgress();
try {
Thread.sleep(8);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
windowManager.updateViewLayout(FloatWindowSmallView.this, mParams);
}
@Override
protected void onPostExecute(Void result) {
// 火箭升空结束后，回归到悬浮窗状态
updateViewStatus();
mParams.x = (int) (xDownInScreen - xInView);
mParams.y = (int) (yDownInScreen - yInView);
windowManager.updateViewLayout(FloatWindowSmallView.this, mParams);
}
}
}
这里在代码中添加了一个isPressed标识位，用于判断用户是否正在拖动悬浮窗。当拖动的时候就调用updateViewStatus()方法来更新悬浮窗的显示状态，这时悬浮窗就会变成一个小火箭。然后当手指离开屏幕的时候，也会调用updateViewStatus()方法，这时发现isPressed为false，就会将悬浮窗重新显示出来。
同时，当手指离开屏幕的时候，还会调用MyWindowManager的isReadyToLaunch()方法来判断小火箭是否被拖动到火箭发射台上了，如果为true，就会触发火箭升空的动画效果。火箭升空的动画实现是写在LaunchTask这个任务里的，可以看到，这里会在doInBackground()方法中执行耗时逻辑，将小火箭的纵坐标不断减小，以让它实现上升的效果。当纵坐标减小到0的时候，火箭升空的动画就结束了，然后在onPostExecute()方法中重新将悬浮窗显示出来。
另外，在AndroidManifest.xml文件中记得要声明两个权限，如下所示：
代码就只有这么多，接下来我们运行一下看看效果吧。在主界面点击Start Float Window按钮可以开启悬浮窗并回到桌面，然后拖动悬浮窗后就会变成小火箭的状态，将它拖动到屏幕底部火箭发射台上，然后放手，小火箭就会腾空而起了.
如下图所示：
好了，今天的讲解就到这里，伴随着小火箭的起飞，我今年的最后一篇文章也结束了。
新的一年即将来临，祝愿大家在未来的一年里，无论是工作还是学习，都能像这个小火箭一样，腾飞起来，达到一个新的高度！2014年，我们继续共同努力！
源码下载，请点击这里
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考高分网。
