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android悬浮窗--获取内存显示当前内存使用量

运行效果:

技术分享其中,

技术分享这一块就是悬浮窗,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:

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;    }    }

其主要功能部分在creatView方法里:

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);            }        });    }

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:

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:

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);    }

从新设置浮动栏的位置参数。这样就实现了拖动的功能。其内存数据是如何获取及及时更新的呢?

我们注意到了handler:

handler.postDelayed(task, delaytime);                                                                                                                       private Runnable task = new Runnable() {        public void run() {            // TODO Auto-generated method stub            dataRefresh();            handler.postDelayed(this, delaytime);            wm.updateViewLayout(view, wmParams);        }    };  

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。

public void dataRefresh() {        tx.setText("" + memInfo.getmem_UNUSED(this) + "KB");        tx1.setText("" + memInfo.getmem_TOLAL() + "KB");    }

最后,看下memInfo的定义:

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;    }    }

里面只定义了两个方法,获取总内存和使用内存。

技术分享

android悬浮窗--获取内存显示当前内存使用量