android悬浮窗--获取内存
来源:互联网 发布:弗里茨x 知乎 编辑:程序博客网 时间:2024/06/05 13:33
首先,得先说明,这个例子并不是我写的,是从eoeAndroid的一个帖子上面看到的,下载了他的源代码,然后分析一下,供学习共享。(另外,对于其代码有所修改,以便于更好的说明问题,另:同时把源代码上传,下载地址:http://download.csdn.net/detail/aomandeshangxiao/3880055)
一开始,我们先看一下运行效果:
其中,
这一块就是悬浮窗,可以随意拖动,动态显示当前内存使用量。
下面看一下代码是如何实现的:
悬浮窗的实现是用了一个service,为什么要用service呢?了解service特点的大体就会明白。下面看一下:
- <span style="font-size:16px;">public class FloatService extends Service {
- WindowManager wm = null;
- WindowManager.LayoutParams wmParams = null;
- View view;
- private float mTouchStartX;
- private float mTouchStartY;
- private float x;
- private float y;
- int state;
- TextView tx1;
- TextView tx;
- ImageView iv;
- private float StartX;
- private float StartY;
- int delaytime=1000;
- @Override
- public void onCreate() {
- Log.d("FloatService", "onCreate");
- super.onCreate();
- view = LayoutInflater.from(this).inflate(R.layout.floating, null);
- tx = (TextView) view.findViewById(R.id.memunused);
- tx1 = (TextView) view.findViewById(R.id.memtotal);
- tx.setText("" + memInfo.getmem_UNUSED(this) + "KB");
- tx1.setText("" + memInfo.getmem_TOLAL() + "KB");
- iv = (ImageView) view.findViewById(R.id.img2);
- iv.setVisibility(View.GONE);
- createView();
- handler.postDelayed(task, delaytime);
- }
- private void createView() {
- // 获取WindowManager
- wm = (WindowManager) getApplicationContext().getSystemService("window");
- // 设置LayoutParams(全局变量)相关参数
- wmParams = new WindowManager.LayoutParams();
- wmParams.type = 2002;
- wmParams.flags |= 8;
- wmParams.gravity = Gravity.LEFT | Gravity.TOP; // 调整悬浮窗口至左上角
- // 以屏幕左上角为原点,设置x、y初始值
- wmParams.x = 0;
- wmParams.y = 0;
- // 设置悬浮窗口长宽数据
- wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
- wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
- wmParams.format = 1;
- wm.addView(view, wmParams);
- view.setOnTouchListener(new OnTouchListener() {
- public boolean onTouch(View v, MotionEvent event) {
- // 获取相对屏幕的坐标,即以屏幕左上角为原点
- x = event.getRawX();
- y = event.getRawY() - 25; // 25是系统状态栏的高度
- Log.i("currP", "currX" + x + "====currY" + y);// 调试信息
- switch (event.getAction()) {
- case MotionEvent.ACTION_DOWN:
- state = MotionEvent.ACTION_DOWN;
- StartX = x;
- StartY = y;
- // 获取相对View的坐标,即以此View左上角为原点
- mTouchStartX = event.getX();
- mTouchStartY = event.getY();
- Log.i("startP", "startX" + mTouchStartX + "====startY"
- + mTouchStartY);// 调试信息
- break;
- case MotionEvent.ACTION_MOVE:
- state = MotionEvent.ACTION_MOVE;
- updateViewPosition();
- break;
- case MotionEvent.ACTION_UP:
- state = MotionEvent.ACTION_UP;
- updateViewPosition();
- showImg();
- mTouchStartX = mTouchStartY = 0;
- break;
- }
- return true;
- }
- });
- iv.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Intent serviceStop = new Intent();
- serviceStop.setClass(FloatService.this, FloatService.class);
- stopService(serviceStop);
- }
- });
- }
- public void showImg() {
- if (Math.abs(x - StartX) < 1.5 && Math.abs(y - StartY) < 1.5
- && !iv.isShown()) {
- iv.setVisibility(View.VISIBLE);
- } else if (iv.isShown()) {
- iv.setVisibility(View.GONE);
- }
- }
- private Handler handler = new Handler();
- private Runnable task = new Runnable() {
- public void run() {
- // TODO Auto-generated method stub
- dataRefresh();
- handler.postDelayed(this, delaytime);
- wm.updateViewLayout(view, wmParams);
- }
- };
- public void dataRefresh() {
- tx.setText("" + memInfo.getmem_UNUSED(this) + "KB");
- tx1.setText("" + memInfo.getmem_TOLAL() + "KB");
- }
- private void updateViewPosition() {
- // 更新浮动窗口位置参数
- wmParams.x = (int) (x - mTouchStartX);
- wmParams.y = (int) (y - mTouchStartY);
- wm.updateViewLayout(view, wmParams);
- }
- @Override
- public void onStart(Intent intent, int startId) {
- Log.d("FloatService", "onStart");
- setForeground(true);
- super.onStart(intent, startId);
- }
- @Override
- public void onDestroy() {
- handler.removeCallbacks(task);
- Log.d("FloatService", "onDestroy");
- wm.removeView(view);
- super.onDestroy();
- }
- @Override
- public IBinder onBind(Intent intent) {
- return null;
- }
- }
- </span>
其主要功能部分在creatView方法里:
- <span style="font-size:16px;">private void createView() {
- // 获取WindowManager
- wm = (WindowManager) getApplicationContext().getSystemService("window");
- // 设置LayoutParams(全局变量)相关参数
- wmParams = new WindowManager.LayoutParams();
- wmParams.type = 2002;
- wmParams.flags |= 8;
- wmParams.gravity = Gravity.LEFT | Gravity.TOP; // 调整悬浮窗口至左上角
- // 以屏幕左上角为原点,设置x、y初始值
- wmParams.x = 0;
- wmParams.y = 0;
- // 设置悬浮窗口长宽数据
- wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
- wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
- wmParams.format = 1;
- wm.addView(view, wmParams);
- view.setOnTouchListener(new OnTouchListener() {
- public boolean onTouch(View v, MotionEvent event) {
- // 获取相对屏幕的坐标,即以屏幕左上角为原点
- x = event.getRawX();
- y = event.getRawY() - 25; // 25是系统状态栏的高度
- Log.i("currP", "currX" + x + "====currY" + y);// 调试信息
- switch (event.getAction()) {
- case MotionEvent.ACTION_DOWN:
- state = MotionEvent.ACTION_DOWN;
- StartX = x;
- StartY = y;
- // 获取相对View的坐标,即以此View左上角为原点
- mTouchStartX = event.getX();
- mTouchStartY = event.getY();
- Log.i("startP", "startX" + mTouchStartX + "====startY"
- + mTouchStartY);// 调试信息
- break;
- case MotionEvent.ACTION_MOVE:
- state = MotionEvent.ACTION_MOVE;
- updateViewPosition();
- break;
- case MotionEvent.ACTION_UP:
- state = MotionEvent.ACTION_UP;
- updateViewPosition();
- showImg();
- mTouchStartX = mTouchStartY = 0;
- break;
- }
- return true;
- }
- });
- iv.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Intent serviceStop = new Intent();
- serviceStop.setClass(FloatService.this, FloatService.class);
- stopService(serviceStop);
- }
- });
- }</span>
首先,代码里面用到了 WindowManager借口,整个Android的窗口机制是基于一个叫做 WindowManager,这个接口可以添加view到屏幕,也可以从屏幕删除view。它面向的对象一端是屏幕,另一端就是View,直接忽略我们以前的Activity或者Dialog之类的东东。其实我们的Activity或者Diolog底层的实现也是通过WindowManager,这个 WindowManager是全局的,整个系统就是这个唯一的东东。它是显示View的最底层了。(该段文字来自网络)其方法很简单,基本用到的就三个addView,removeView,updateViewLayout。另:在设置View高度和宽度的时候一个错误,即在View的构造函数中获取getWidth()和getHeight(),当一个view对象创建时,android并不知道其大小,所以getWidth()和getHeight()返回的结果是0,真正大小是在计算布局时才会计算,所以会发现一个有趣的事,即在onDraw( ) 却能取得长宽的原因。使用一下方法即可:
- width = activity.getWindowManager().getDefaultDisplay().getWidth();
- height = activity.getWindowManager().getDefaultDisplay().getHeight();
下面是LayoutParams,设置他的属性:详情请看上一篇文章:
http://blog.csdn.net/aomandeshangxiao/article/details/7040486
在这里是设置成了所有应用程序之上,状态栏之下的形式,当移动的时候,会调用case MotionEvent.ACTION_MOVE:
下面的代码主要是:
- <span style="font-size:16px;">private void updateViewPosition() {
- // 更新浮动窗口位置参数
- wmParams.x = (int) (x - mTouchStartX);
- wmParams.y = (int) (y - mTouchStartY);
- wm.updateViewLayout(view, wmParams);
- }</span>
我们注意到了handler:
- <span style="font-size:16px;">handler.postDelayed(task, delaytime); private Runnable task = new Runnable() {
- <span> </span>public void run() {
- <span> </span>// TODO Auto-generated method stub
- <span> </span>dataRefresh();
- <span> </span>handler.postDelayed(this, delaytime);
- <span> </span>wm.updateViewLayout(view, wmParams);
- <span> </span>}
- <span> </span>}; </span>
我们找到dataRefresh方法,delaytime是设置的1000,也就是每一秒钟更新一次数据。
- <span style="font-size:16px;"> public void dataRefresh() {
- tx.setText("" + memInfo.getmem_UNUSED(this) + "KB");
- tx1.setText("" + memInfo.getmem_TOLAL() + "KB");
- }</span>
最后,看下memInfo的定义:
- <span style="font-size:16px;">public class memInfo {
- public static long getmem_UNUSED(Context mContext) {
- long MEM_UNUSED;
- ActivityManager am = (ActivityManager) mContext
- .getSystemService(Context.ACTIVITY_SERVICE);
- ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
- am.getMemoryInfo(mi);
- MEM_UNUSED = mi.availMem / 1024;
- return MEM_UNUSED;
- }
- public static long getmem_TOLAL() {
- long mTotal;
- // 系统内存
- String path = "/proc/meminfo";
- // 存储器内容
- String content = null;
- BufferedReader br = null;
- try {
- br = new BufferedReader(new FileReader(path), 8);
- String line;
- if ((line = br.readLine()) != null) {
- // 采集内存信息
- content = line;
- }
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- if (br != null) {
- try {
- br.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- // beginIndex
- int begin = content.indexOf(':');
- // endIndex
- int end = content.indexOf('k');
- // 采集数量的内存
- content = content.substring(begin + 1, end).trim();
- // 转换为Int型
- mTotal = Integer.parseInt(content);
- return mTotal;
- }
- }
- </span>
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