CopyFileToSD

public class CopyFile extends Activity {
	
	private static String APP_NAME = "MyAssets";
	
	private Button mButton;
	private LinearLayout mLayout;
	private AssetManager mAsset;
	private ProgressDialog mDialog;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setRequestedOrientation(ActivityInfo
        		.SCREEN_ORIENTATION_LANDSCAPE);
        
        mLayout = new LinearLayout(this);
        mButton = new Button(this);
        mLayout.setOrientation(LinearLayout.VERTICAL);
        mButton.setText("Copy File");
        mButton.setLayoutParams(new LinearLayout.LayoutParams(
        		LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
        mLayout.addView(mButton);
        setContentView(mLayout);
        
        mAsset = getAssets();
        mDialog = new ProgressDialog(this);
        
        mButton.setOnClickListener(new Button.OnClickListener(){
			@Override
			public void onClick(View v) {
				startCopy();
			}
        });
    }
    
    public void startCopy(){
    	showProgress();
    	Thread t = new Thread(new ProcessCopy());
    	t.start();
    }
    
    public class ProcessCopy implements Runnable{
    	public void run(){
    		doCopy();
    		mHandler.sendEmptyMessage(MESSAGE_COMPLETE);
    	}
    }
    
    public void onStart(){
    	super.onStart();
    	System.out.println("onStart......");
    }
    
    public void doCopy(){
    	try {
			String[] arrFile = mAsset.list("");
			if (arrFile != null) {
				for (int i = 0; i < arrFile.length; i++) {
					System.out.println(arrFile[i]);
					copyFile(arrFile[i]);
				}
			} 
		} catch (IOException e) {
			e.printStackTrace();
		}
    }
    
    /**
     * copy file from assets to sd
     */
    public void copyFile(String path){
    	try {
			String[] list = mAsset.list(path);
			InputStream is = null;
			if (list != null && list.length != 0) {
				for (int i = 0; i < list.length; i++) {
					System.out.println(path + "/" + list[i]);
					copyFile(path + "/" + list[i]);
				}
			} else {//濡傛灉涓虹┖锛屽垯璁や负瀹冩槸涓�釜鏂囦欢
				System.out.println("copy file: " + path);
				is = mAsset.open(path);
				saveFileToSD(is, path);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
    }
    
    /**
     * save file to sd
     * @param is
     * @param path
     */
    public void saveFileToSD(InputStream is, String path){
    	String sp = Environment.getExternalStorageDirectory() + "/" + APP_NAME + "/";
    	File f = new File(sp + path);
    	String parentDir = f.getParent();
    	File parentFile = new File(parentDir);
    	
    	if (!parentFile.exists()) {
    		parentFile.mkdirs();
    		System.out.println("create dir " +parentFile.getPath());
    	}
    	
    	if (!f.exists()) {
    		try {
    			f.createNewFile();
    			System.out.println("create new file " + f.getPath());
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	} else {
    		System.out.println("delete file " + f.getPath());
    		f.delete();
    	}
    	
    	try {
    		DataInputStream dis = new DataInputStream(is);
    		FileOutputStream fOut = new FileOutputStream(f);
    		int n = 1024;
    		byte[] buffer = new byte[n];
    		int num;
    		while ((num = dis.available()) != 0) {
				dis.readFully(buffer, 0, num);
    			fOut.write(buffer);
			}
    		
    		fOut.flush();
    		fOut.close();
    		dis.close();
    	} catch (FileNotFoundException e) {
    		e.printStackTrace();
    	} catch (IOException e) {
    		e.printStackTrace();
    	}
    }
    
    /**
     * show progress dialog
     */
    public void showProgress(){
    	mDialog = ProgressDialog.show(this, "Title", "Copying, please wait...");
    }
    
    public static final int MESSAGE_COMPLETE = 0;
    
    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case MESSAGE_COMPLETE:
            	mDialog.dismiss();
            	break;
            }
        }
    };
}