调用系统相机拍照并保存在sdcard上

public void click(View view) throws Exception {
Intent intent = new Intent();
intent.setAction("android.media.action.IMAGE_CAPTURE");
intent.addCategory("android.intent.category.DEFAULT");
String fileName = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date())+".jpg";
System.out.println(fileName);
File file = new File("/sdcard/"+fileName);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
startActivity(intent);
}

<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<!--<uses-feature android:name="android.hardware.camera"/>-->