Android读取本地TXT文件

public class MainActivity extends AppCompatActivity {    TextView tv1,tv2;    Button bOpen;    EditText et;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv1=(TextView)this.findViewById(R.id.tv1);        tv2=(TextView)this.findViewById(R.id.textView2);        bOpen=(Button)this.findViewById(R.id.button);        et=(EditText)this.findViewById(R.id.editText);        bOpen.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String str=loadFromSDFile(et.getText().toString().trim());                tv2.setText(str);            }        });    }    private String loadFromSDFile(String fname) {        fname="/"+fname;        String result=null;        try {            File f=new File(Environment.getExternalStorageDirectory().getPath()+fname);            int length=(int)f.length();            byte[] buff=new byte[length];            FileInputStream fin=new FileInputStream(f);            fin.read(buff);            fin.close();            result=new String(buff,"UTF-8");        }catch (Exception e){            e.printStackTrace();            Toast.makeText(MainActivity.this,"没有找到指定文件",Toast.LENGTH_SHORT).show();        }        return result;    }}
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