Android 格式化内部存储

1,在设置界面点击>存储->格式化内部存储将会执行
packages/apps/Settings/src/com/android/settings/deviceinfo/Memory.java
        
                
  1. if(preference==mSdFormat){
    2.             
  2. Intentintent=newIntent(Intent.ACTION_VIEW);
    3.             
  3. intent.setClass(this,com.android.settings.MediaFormat.class);
    4.             
  4. startActivity(intent);
    5.             
  5. returntrue;
    6.             
  6. }
    7.             

    8.         
2,packages/apps/Settings/src/com/android/settings/MediaFormat.java
下面将会跳到onCreate方法的establishInitialState();
            
                    
  1. protectedvoidonCreate(BundlesavedState){
    2.                 
  2. @Override protected void onCreate(Bundle savedState) { super.onCreate(savedState); establishInitialState(); }
    3.             

3,构造第一个含有一个按钮(格式化内部大容量存储设备)的页面,并为按钮添加事件
                
                        
  1. privatevoidestablishInitialState(){
    2.                     
  2. if(mInitialView==null){
    3.                     
  3. mInitialView=mInflater.inflate(R.layout.media_format_primary,null);
    4.                     
  4. mInitiateButton=
    5.                     
  5. (Button)mInitialView.findViewById(R.id.initiate_media_format);
    6.                     
  6. mInitiateButton.setOnClickListener(mInitiateListener);
    7.                     
  7. }
    8.                     
  8. }
    9.                 
4,当点击这个按钮时将会跳到确认页面,防止误操作
                    
                            
  1. privateButton.OnClickListenermInitiateListener=newButton.OnClickListener(){
    2.                         
  2. publicvoidonClick(Viewv){
    3.                         
  3. if(!runKeyguardConfirmation(KEYGUARD_REQUEST)){
    4.                         
  4. establishFinalConfirmationState();
    5.                         
  5. }
    6.                         
  6. }
    7.                         
  7. };
    8.                     
5,确认格式化大容量存储设备的时候将会发送一个Intent,并将要格式化的路径传入
                        
                                
  1. Intentintent=newIntent(ExternalStorageFormatter.FORMAT_ONLY);
    2.                             
  2. intent.setComponent(ExternalStorageFormatter.COMPONENT_NAME);
    3.                             
  3. StringstrPath=Environment.getExternalStorageDirectory().getPath();
    4.                             
  4. intent.putExtra("path",strPath);
    5.                             
  5. startService(intent);
    6.                         
6,frameworks/base/core/java/com/android/internal/os/storage/ExternalStorageFormatter.java
执行ExternalStorageFormatter类中的public int onStartCommand(Intent intent, int flags, int startId)方法
接收路径并执行updateProgressState()方法
7,在updateProgressState()方法中判断路径是否存在,将卸载存储卡,
                        
                                
  1. if(Environment.MEDIA_MOUNTED.equals(status)
    2.                             
  2. ||Environment.MEDIA_MOUNTED_READ_ONLY.equals(status)){
    3.                             
  3. updateProgressDialog(mIsSdcard?R.string.progress_unmounting:R.string.progress_unmounting_nand);
    4.                             
  4. SystemProperties.set("sys.storage.state","formating");
    5.                             
  5. IMountServicemountService=getMountService();
    6.                             
  6. try{
    7.                             
  7. /*
    8.                             
  8. *Formountpointofexternalsdcardis:/mnt/sdcard/external_sd,
    9.                             
  9. *unmountsdcardfirst.
    10.                             
  10. */
    11.                             
  11. if(mPath.equals(Environment.getFlashStorageDirectory().toString())){
    12.                             
  12. updateProgressDialog(R.string.progress_unmounting_nand);
    13.                             
  13. mountService.unmountVolume(Environment.getActExternalStorageDirectory().toString(),true);
    14.                             
  14. }
    15.                             
  15. mountService.unmountVolume(mPath,true);
    16.                             
  16. }
    17.                         
8,成功卸载SD卡会激发StorageEventListener mStorageListener = new StorageEventListener()事件
mStorageListener会重新执行updateProgressState()方法
9,再次执行updateProgressState()方法的时候SD卡已经卸载将会执行格式化操作
                            
                                    
  1. if(Environment.MEDIA_NOFS.equals(status)
    2.                                 
  2. ||Environment.MEDIA_UNMOUNTED.equals(status)
    3.                                 
  3. ||Environment.MEDIA_UNMOUNTABLE.equals(status)){
    4.                                 
  4. updateProgressDialog(mIsSdcard?R.string.progress_erasing:R.string.progress_erasing_nand);
    5.                                 
  5. SystemProperties.set("sys.storage.state","ready");
    6.                                 
  6. finalIMountServicemountService=getMountService();
    7.                                 
  7. finalStringextStoragePath=mPath;//Environment.getExternalStorageDirectory().toString();
    8.                                 
  8. if(mountService!=null){
    9.                                 
  9. newThread(){
    10.                                 
  10. publicvoidrun(){
    11.                                 
  11. booleansuccess=false;
    12.                                 
  12. try{
    13.                                 
  13. mountService.formatVolume(extStoragePath);
    14.                                 
  14. success=true;
    15.                                 
  15. }catch(Exceptione){
    16.                                 
  16. Toast.makeText(ExternalStorageFormatter.this,mIsSdcard?
    17.                                 
  17. R.string.format_error:R.string.format_error_nand,Toast.LENGTH_LONG).show();
    18.                                 
  18. }
    19.                                 
  19. if(success){
    20.                                 
  20. if(mFactoryReset){
    21.                                 
  21. android.os.SystemProperties.set("ctl.start","bootanim");
    22.                                 
  22. sendBroadcast(newIntent("android.intent.action.MASTER_CLEAR"));
    23.                                 
  23. //Intenthandlingisasynchronous--assumeitwillhappensoon.
    24.                                 
  24. stopSelf();
    25.                                 
  25. return;
    26.                                 
  26. }
    27.                                 
  27. }
    28.                                 
  28. //Ifwedidn'tsucceed,oraren'tdoingafullfactory
    29.                                 
  29. //reset,thenitistimetoremountthestorage.
    30.                                 
  30. if(!success&&mAlwaysReset){
    31.                                 
  31. sendBroadcast(newIntent("android.intent.action.MASTER_CLEAR"));
    32.                                 
  32. }
    33.                             
10,success等于真的话会会清楚缓存,语句mountService.formatVolume(extStoragePath);是格式化操作
                                
                                        
  1. publicintformatVolume(StringmountPoint)throwsRemoteException{
    2.                                     
  2. Parcel_data=Parcel.obtain();
    3.                                     
  3. Parcel_reply=Parcel.obtain();
    4.                                     
  4. int_result;
    5.                                     
  5. try{
    6.                                     
  6. _data.writeInterfaceToken(DESCRIPTOR);
    7.                                     
  7. _data.writeString(mountPoint);
    8.                                     
  8. mRemote.transact(Stub.TRANSACTION_formatVolume,_data,_reply,0);
    9.                                     
  9. _reply.readException();
    10.                                     
  10. _result=_reply.readInt();
    11.                                     
  11. }finally{
    12.                                     
  12. _reply.recycle();
    13.                                     
  13. _data.recycle();
    14.                                     
  14. }
    15.                                     
  15. return_result;
    16.                                     
  16. }
    17.

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