Java - 列印所有程式程式碼行數

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class ScanCode {
public static void main(String args[]) {
ScanCode scanCode = new ScanCode();

final File folder = new File("C:\\workspace\\android\\src");
scanCode.listFilesForFolder(folder);
}

public void listFilesForFolder(final File folder) {
   for (final File fileEntry : folder.listFiles()) {
       if (fileEntry.isDirectory()) {
           listFilesForFolder(fileEntry);
       } else {
        try {
        System.out.println(folder.getAbsolutePath() + "\t" + fileEntry.getName() + "\t" +countLines(fileEntry.getAbsolutePath()));
        } catch(Exception ex) {
        ex.printStackTrace();
        }
       }
   }
}

public int countLines(String filename) throws IOException {
   InputStream is = new BufferedInputStream(new FileInputStream(filename));
   try {
       byte[] c = new byte[1024];
       int count = 0;
       int readChars = 0;
       boolean empty = true;
       while ((readChars = is.read(c)) != -1) {
           empty = false;
           for (int i = 0; i < readChars; ++i) {
               if (c[i] == '\n') {
                   ++count;
               }
           }
       }
       return (count == 0 && !empty) ? 1 : count;
   } finally {
       is.close();
   }
}

}

Android 實戰記錄 (20) - status bar 背景色變更

要改status bar 背景色，
需要先把build.gradle 的 compileSdkVersion設為 21以上

並且在程式加入以下程式碼。

Window window = getWindow();
// clear FLAG_TRANSLUCENT_STATUS flag:window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
// add FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS flag to the windowwindow.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);

if (android.os.Build.VERSION.SDK_INT >= 21) {
// finally change the color   window.setStatusBarColor(getResources().getColor(R.color.status_bar_background));
}

status bar 的背景色，只支援 sdk 21 以上，

而開發者，需要將compile sdk設在21以上，compile才不會出錯。

並且做 sdk判斷，才能避免出問題。

Android status bar 是從 Android 5.0開始才支援Lollipop 版本，

Android 實戰記錄 (19) - ViewPager 滑動速度

因為要做輪播，但輪播速度過快，導致
需要調整滑動速度
參考以下這個解

 http://my.oschina.net/javalover/blog/179003

public class FixedSpeedScroller extends Scroller {

    private int mDuration = 1500;

    public FixedSpeedScroller(Context context) {

        super(context);

    }

    public FixedSpeedScroller(Context context, Interpolator interpolator) {

        super(context, interpolator);

    }

    @Override

    public void startScroll(int startX, int startY, int dx, int dy, int duration) {

        // Ignore received duration, use fixed one instead

        super.startScroll(startX, startY, dx, dy, mDuration);

    }

    @Override

    public void startScroll(int startX, int startY, int dx, int dy) {

        // Ignore received duration, use fixed one instead

        super.startScroll(startX, startY, dx, dy, mDuration);

    }

    public void setmDuration(int time) {

        mDuration = time;

    }

    public int getmDuration() {

        return mDuration;

    }

}

try {

    Field field = ViewPager.class.getDeclaredField("mScroller");

    field.setAccessible(true);

    FixedSpeedScroller scroller = new FixedSpeedScroller(mViewPager.getContext(),

         new AccelerateInterpolator());

    field.set(mViewPager, scroller);

    scroller.setmDuration(2000);

} catch (Exception e) {

    LogUtils.e(TAG, "", e);

}