android悬浮窗--获取内存.doc

android悬浮窗-获取内存 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：/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：java view plaincopyprint?1. publicclassFloatServiceextendsService2. 3. WindowManagerwm=null;4. WindowManager.LayoutParamswmParams=null;5. Viewview;6. privatefloatmTouchStartX;7. privatefloatmTouchStartY;8. privatefloatx;9. privatefloaty;10. intstate;11. TextViewtx1;12. TextViewtx;13. ImageViewiv;14. privatefloatStartX;15. privatefloatStartY;16. intdelaytime=1000;17. Override18. publicvoidonCreate()19. Log.d(FloatService,onCreate);20. super.onCreate();21. view=LayoutInflater.from(this).inflate(R.layout.floating,null);22. tx=(TextView)view.findViewById(R.id.memunused);23. tx1=(TextView)view.findViewById(R.id.memtotal);24. tx.setText(+memInfo.getmem_UNUSED(this)+KB);25. tx1.setText(+memInfo.getmem_TOLAL()+KB);26. iv=(ImageView)view.findViewById(R.id.img2);27. iv.setVisibility(View.GONE);28. createView();29. handler.postDelayed(task,delaytime);30. 31. 32. privatevoidcreateView()33. /获取WindowManager 34. wm=(WindowManager)getApplicationContext().getSystemService(window);35. /设置LayoutParams(全局变量）相关参数 36. wmParams=newWindowManager.LayoutParams();37. wmParams.type=2002;38. wmParams.flags|=8;39. wmParams.gravity=Gravity.LEFT|Gravity.TOP;/调整悬浮窗口至左上角 40. /以屏幕左上角为原点，设置x、y初始值 41. wmParams.x=0;42. wmParams.y=0;43. /设置悬浮窗口长宽数据 44. wmParams.width=WindowManager.LayoutParams.WRAP_CONTENT;45. wmParams.height=WindowManager.LayoutParams.WRAP_CONTENT;46. wmParams.format=1;47. 48. wm.addView(view,wmParams);49. 50. view.setOnTouchListener(newOnTouchListener()51. publicbooleanonTouch(Viewv,MotionEventevent)52. /获取相对屏幕的坐标，即以屏幕左上角为原点 53. x=event.getRawX();54. y=event.getRawY()-25;/25是系统状态栏的高度 55. Log.i(currP,currX+x+=currY+y);/调试信息 56. switch(event.getAction()57. caseMotionEvent.ACTION_DOWN:58. state=MotionEvent.ACTION_DOWN;59. StartX=x;60. StartY=y;61. /获取相对View的坐标，即以此View左上角为原点 62. mTouchStartX=event.getX();63. mTouchStartY=event.getY();64. Log.i(startP,startX+mTouchStartX+=startY65. +mTouchStartY);/调试信息 66. break;67. caseMotionEvent.ACTION_MOVE:68. state=MotionEvent.ACTION_MOVE;69. updateViewPosition();70. break;71. 72. caseMotionEvent.ACTION_UP:73. state=MotionEvent.ACTION_UP;74. 75. updateViewPosition();76. showImg();77. mTouchStartX=mTouchStartY=0;78. break;79. 80. returntrue;81. 82. );83. 84. iv.setOnClickListener(newOnClickListener()85. Override86. publicvoidonClick(Viewv)87. /TODOAuto-generatedmethodstub 88. IntentserviceStop=newIntent();89. serviceStop.setClass(FloatService.this,FloatService.class);90. stopService(serviceStop);91. 92. );93. 94. 95. 96. publicvoidshowImg()97. if(Math.abs(x-StartX)1.5&Math.abs(y-StartY)1.598. &!iv.isShown()99. iv.setVisibility(View.VISIBLE);100. elseif(iv.isShown()101. iv.setVisibility(View.GONE);102. 103. 104. 105. privateHandlerhandler=newHandler();106. privateRunnabletask=newRunnable()107. publicvoidrun()108. /TODOAuto-generatedmethodstub 109. dataRefresh();110. handler.postDelayed(this,delaytime);111. wm.updateViewLayout(view,wmParams);112. 113. ;114. 115. publicvoiddataRefresh()116. tx.setText(+memInfo.getmem_UNUSED(this)+KB);117. tx1.setText(+memInfo.getmem_TOLAL()+KB);118. 119. 120. privatevoidupdateViewPosition()121. /更新浮动窗口位置参数 122. wmParams.x=(int)(x-mTouchStartX);123. wmParams.y=(int)(y-mTouchStartY);124. wm.updateViewLayout(view,wmParams);125. 126. 127. Override128. publicvoidonStart(Intentintent,intstartId)129. Log.d(FloatService,onStart);130. setForeground(true);131. super.onStart(intent,startId);132. 133. 134. Override135. publicvoidonDestroy()136. handler.removeCallbacks(task);137. Log.d(FloatService,onDestroy);138. wm.removeView(view);139. super.onDestroy();140. 141. 142. Override143. publicIBinderonBind(Intentintent)144. returnnull;145. 146. 147. 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;Overridepublic 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WindowManagerwm = (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() Overridepublic void onClick(View v) / TODO Auto-generated method stubIntent 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 stubdataRefresh();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);Overridepublic void onStart(Intent intent, int startId) Log.d(FloatService, onStart);setForeground(true);super.onStart(intent, startId);Overridepublic void onDestroy() handler.removeCallbacks(task);Log.d(FloatService, onDestroy);wm.removeView(view);super.onDestroy();Overridepublic IBinder onBind(Intent intent) return null;其主要功能部分在creatView方法里： java view plaincopyprint?1. privatevoidcreateView()2. /获取WindowManager 3. wm=(WindowManager)getApplicationContext().getSystemService(window);4. /设置LayoutParams(全局变量）相关参数 5. wmParams=newWindowManager.LayoutParams();6. wmParams.type=2002;7. wmParams.flags|=8;8. wmParams.gravity=Gravity.LEFT|Gravity.TOP;/调整悬浮窗口至左上角 9. /以屏幕左上角为原点，设置x、y初始值 10. wmParams.x=0;11. wmParams.y=0;12. /设置悬浮窗口长宽数据 13. wmParams.width=WindowManager.LayoutParams.WRAP_CONTENT;14. wmParams.height=WindowManager.LayoutParams.WRAP_CONTENT;15. wmParams.format=1;16. 17. wm.addView(view,wmParams);18. 19. view.setOnTouchListener(newOnTouchListener()20. publicbooleanonTouch(Viewv,MotionEventevent)21. /获取相对屏幕的坐标，即以屏幕左上角为原点 22. x=event.getRawX();23. y=event.getRawY()-25;/25是系统状态栏的高度 24. Log.i(currP,currX+x+=currY+y);/调试信息 25. switch(event.getAction()26. caseMotionEvent.ACTION_DOWN:27. state=MotionEvent.ACTION_DOWN;28. StartX=x;29. StartY=y;30. /获取相对View的坐标，即以此View左上角为原点 31. mTouchStartX=event.getX();32. mTouchStartY=event.getY();33. Log.i(startP,startX+mTouchStartX+=startY34. +mTouchStartY);/调试信息 35. break;36. caseMotionEvent.ACTION_MOVE:37. state=MotionEvent.ACTION_MOVE;38. updateViewPosition();39. break;40. 41. caseMotionEvent.ACTION_UP:42. state=MotionEvent.ACTION_UP;43. 44. updateViewPosition();45. showImg();46. mTouchStartX=mTouchStartY=0;47. break;48. 49. returntrue;50. 51. );52. 53. iv.setOnClickListener(newOnClickListener()54. Override55. publicvoidonClick(Viewv)56. /TODOAuto-generatedmethodstub 57. IntentserviceStop=newIntent();58. serviceStop.setClass(FloatService.this,FloatService.class);59. stopService(serviceStop);60. 61. );62. 63. private void createView() / 获取WindowManagerwm = (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() Overridepublic void onClick(View v) / TODO Auto-generated method stubIntent 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：html view plaincopyprint?1. width=activity.getWindowManager().getDefaultDisplay().getWidth();2. height=activity.getWindowManager().getDefaultDisplay().getHeight();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：/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：java view plaincopyprint?1. privatevoidupdateViewPosition()2. /更新浮动窗口位置参数 3. wmParams.x=(int)(x-mTouchStartX);4. wmParams.y=(int)(y-mTouchStartY);5. wm.updateViewLayout(view,wmParams);6. 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：java view plaincopyprint?1. handler.postDelayed(task,delaytime);privateRunnabletask=newRunnable()2. publicvoidrun()3. /TODOAuto-generatedmethodstub 4. dataRefresh();5. handler.postDelayed(this,delaytime);6. wm.updateViewLayout(view,wmParams);7. 8. ;handler.postDelayed(task, delaytime); private Runnable task = new Runnable() public void run() / TODO Auto-generated method stubdataRefresh();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。 j