如提，我快崩溃惹
我照了许多网站上面的教学如实去做，但跑到读档的地方就会跳出来失败
这里:
BufferedReader br = new BufferedReader(new FileReader(file));
但我不晓得可能是哪里有问题，所以先把档案丢上来
package ericz7000nolan.my_new_android_application;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
import java.io.*;
import static ericz7000nolan.my_new_android_application.R.id.show_file;
public class MYFIRSTAPP extends AppCompatActivity {
public final static String EXTRA_MESSAGE =
"ericz7000nolan.myfirstapp.MESSAGE";
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
//