I/ActivityManager(96): Starting: Intent { act=android.intent.action.VIEW cmp=com.android.vending/com.google.android.finsky.activities.IabActivity (has extras) } from pid -1
D/Finsky(23209): [1] SelfUpdateScheduler.checkForSelfUpdate: Skipping self-update. Local Version [8014017] >= Server Version [0]
I/Mozc(167): RUN EMOJI PROVIDER DETECTION: null
I/ActivityManager(96): Displayed com.android.vending/com.google.android.finsky.activities.IabActivity: +284ms
W/Finsky(23209): [1] CarrierParamsAction.run: Saving carrier billing params failed.
E/Finsky(23209): [31] FileBasedKeyValueStore.delete: Attempt to delete '***' failed!
D/Finsky(23209): [1] GetBillingCountriesAction.run: Skip getting fresh list of billing countries.
E/Finsky(23209): [1] CarrierBillingUtils.isDcb30: CarrierBillingParameters are null, fallback to 2.0
E/Finsky(23209): [1] CheckoutPurchase.setError: type=IAB_PERMISSION_ERROR, code=12, message=null

    File dst = new File(mContext.getExternalFilesDir(null), "dst.txt");
    // dst = "/mnt/sdcard/Android/data/com.sample/files/dst.txt"

    FileChannel srcChannel = null;
    FileChannel destChannel = null;

    try {
        // ファイルのコピー
        if (dst.exists()) {
            dst.delete();
        }
        dst.createNewFile();
        FileInputStream in = mContext.openFileInput("src.txt");
        FileOutputStream out = new FileOutputStream(dst, false);

        srcChannel = in.getChannel();
        destChannel = out.getChannel();

        srcChannel.transferTo(0, srcChannel.size(), destChannel);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (srcChannel != null) {
            try {
                srcChannel.close();
            } catch (IOException e) {
            }
        }
        if (destChannel != null) {
            try {
                destChannel.close();
            } catch (IOException e) {
            }
        }
    }

        Intent intent = new Intent(Intent.ACTION_SEND);
        String[] to = { "hoge@sample.com" };
        intent.putExtra(Intent.EXTRA_EMAIL, to);
        intent.putExtra(Intent.EXTRA_TEXT, "test");
        intent.putExtra(Intent.EXTRA_SUBJECT, "send mail test");
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setType("message/rfc822");

        context.startActivity(Intent.createChooser(intent, "Choose Email Client"));

        Intent intent1 = new Intent(Intent.ACTION_SEND);
        String[] to = { "hoge@sample.com" };
        intent1.putExtra(Intent.EXTRA_EMAIL, to);
        intent1.putExtra(Intent.EXTRA_TEXT, "test");
        intent1.putExtra(Intent.EXTRA_SUBJECT, "send mail test");
        intent1.setType("message/rfc822");

        Intent intent2 = Intent.createChooser(intent1, "Choose Email Client");
        intent2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent2);