android 4.0 屏蔽home键实现.docx

android 4.0 屏蔽home键实现 分类： Android 2012-05-01 18:14 115人阅读 评论(0) 收藏 举报 最近研究锁屏，按照常规的方法，常规方法如下Java代码 1. publicvoidonAttachedToWindow() 2. 3. this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD); 4. super.onAttachedToWindow(); 5. 但是这个方法到了4.0的系统上就失效了，按home照样会返回桌面。apktool了几个锁屏的软件之后发现其实现方法，即用WindowManager的addview方法将view加到窗口上，加上的时候将view的layoutparamas的type设为LayoutParams.TYPE_SYSTEM_ERROR，这个值sdk的解释为Java代码 1. publicstaticfinalintTYPE_SYSTEM_ERROR 2. Since:APILevel1 3. Windowtype:internalsystemerrorwindows,appearontopofeverythingtheycan.如果直接这样用会报错，还要在AndroidManifest.xml里面加上权限，ok上完整代码，封装了一个类，其中Lock和hide方法实现锁屏和解锁。Java代码 1. publicclassLockLayer 2. privateActivitymActivty; 3. privateWindowManagermWindowManager; 4. privateViewmLockView; 5. privateLayoutParamsmLockViewLayoutParams; 6. 7. publicLockLayer(Activityact) 8. mActivty=act; 9. init(); 10. 11. 12. privatevoidinit() 13. mWindowManager=mActivty.getWindowManager(); 14. mLockViewLayoutParams=newLayoutParams(); 15. mLockViewLayoutParams.width=LayoutParams.MATCH_PARENT; 16. mLockViewLayoutParams.height=LayoutParams.MATCH_PARENT; 17. /实现关键 18. mLockViewLayoutParams.type=LayoutParams.TYPE_SYSTEM_ERROR; 19. /apktoolvalue，这个值具体是哪个变量还请网友帮忙 20. mLockViewLayoutParams.flags=1280; 21. 22. publicvoidlock() 23. if(mLockView!=null) 24. mWindowManager.addView(mLockView,mLockViewLayoutParams); 25. 26. 27. publicvoidunlock() 28. if(mWindowManager!=null) 29. mWindowManager.removeView(mLockView); 30. 31. 32. publicvoidsetLockView(Viewv) 33. mLockView=v; 34. 35. 使用方法如下Java代码 1. publicvoidonCreate(BundlesavedInstanceState) 2. super.onCreate(savedInstanceState); 3. Viewlock=View.inflate(this,R.layout.main,null); 4. LockLayerlockLayer=newLockLayer(this); 5. lockLayer.setLockView(lock); 6. lockLayer.lock(); 7. ok,这时可以实现按home键不返回桌面的效果，其他的键需要用另外的代码实现，网上都有。这段代码只调用一次的时候没有问题，但是如果遇到多线程或者多次lock和hide就会有问题，修改如下，一是将LockLayer改为单例模式，二是在hide和lock的时候先判断状态。修改后代码如下Java代码 1. publicclassLockLayer 2. privateActivitymActivty; 3. privateWindowManagermWindowManager; 4. privateViewmLockView; 5. privateLayoutParamsmLockViewLayoutParams; 6. privatestaticLockLayermLockLayer; 7. privatebooleanisLocked; 8. 9. publicstaticsynchronizedLockLayergetInstance(Activityact) 10. if(mLockLayer=null) 11. mLockLayer=newLockLayer(act); 12. 13. returnmLockLayer; 14. 15. 16. privateLockLayer(Activityact) 17. mActivty=act; 18. init(); 19. 20. 21. privatevoidinit() 22. isLocked=false; 23. mWindowManager=mActivty.getWindowManager(); 24. mLockViewLayoutParams=newLayoutParams(); 25. mLockViewLayoutParams.width=LayoutParams.MATCH_PARENT; 26. mLockViewLayoutParams.height=LayoutParams.MATCH_PARENT; 27. /实现关键 28. mLockViewLayoutParams.type=LayoutParams.TYPE_SYSTEM_ERROR; 29. /apktoolvalue，这个值具体是哪个变量还请网友帮忙 30. mLockViewLayoutParams.flags=1280; 31. 32. publicsynchronizedvoidlock() 33. if(mLockView!=null&!isLocked) 34. mWindowManager.addView(mLockView,mLockViewLayoutParams); 35. 36. isLocked=true; 37. 38. publicsynchronizedvoidunlock() 39. if(mWindowManager!=null&isLocked) 40. mWindowManager.removeView(mLockView); 41. 42