sd卡写入读取

来源：互联网发布：幼儿园美工室制度编辑：程序博客网时间：2024/05/06 19:57
public class MainActivity extends AppCompatActivity {    private BufferedReader sb;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button btn_main_write= (Button) findViewById(R.id.btn_main_write);        Button btn_main_read = (Button) findViewById(R.id.btn_main_read);        btn_main_write.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                try {                    saveToSDCard("/bawei.txt","万新就业，高新就业");                } catch (Exception e) {                    e.printStackTrace();                }            }        });        btn_main_read.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {            String s = readsf();                Toast.makeText(MainActivity.this,"============"+s,Toast.LENGTH_SHORT).show();            }        });    }    public void saveToSDCard(String filename,String content) throws Exception{        File file=new File(Environment.getExternalStorageDirectory()+filename);        FileWriter out= new FileWriter(file);        out.write(content);        Toast.makeText(MainActivity.this,"写入成功",Toast.LENGTH_SHORT).show();        out.close();    }    private String readsf(){        File file=new File(Environment.getExternalStorageDirectory(),"/bawei.txt");        try {            FileReader inputStream= new FileReader(file);            sb = new BufferedReader(inputStream);            return  sb.readLine();        } catch (Exception e) {            e.printStackTrace();        }        return  null;    }}
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