Android設定寄送夾帶附件的E-mail時附件無法使用

問題起因

基本上使用常見的方法如下

Intent i = new Intent(Intent.ACTION_SEND);
i.setType("image/jpeg");
i.putExtra(Intent.EXTRA_EMAIL  , new String[]{sendTarget});
i.putExtra(Intent.EXTRA_SUBJECT, sendSubject);
i.putExtra(Intent.EXTRA_TEXT   , sendText);
i.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+ filePath));
try {
     curActivity.startActivity(Intent.createChooser(i, "Please select Email client"));
} catch (android.content.ActivityNotFoundException ex) {
    Toast.makeText(curActivity, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}

問題出於我給的是Internal Storage的路徑，所以基本上當其它的應用程式要取用檔案時有有存取權限問題

解決方式

copy一份到External Storage再用copy檔的路徑即可

File externalPicPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File dstFile = new File(externalPicPath, "picture.png");
try{
    FileInputStream in = new FileInputStream(filePath);
    FileOutputStream out = new FileOutputStream(dstFile);
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
    in.close();
    out.close();
}
catch(IOException e)
{
    Toast.makeText(curActivity, "I/O Error.", Toast.LENGTH_SHORT).show();
     return;
}