Android中关于IO储存的小记

概述通过SharedPreferences存储数据privateSharedPreferencesmrsoft;//创建对象protectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_qq2);finalEditTextqqzh=

通过Shared Preferences存储数据

 private SharedPreferences mrsoft;//创建对象

 protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_qq2);        final EditText qqzh = findVIEwByID(R.ID.qqzh);        final EditText qqmm = findVIEwByID(R.ID.qqmm);        button qqdl=findVIEwByID(R.ID.qqdl);        mrsoft = getSharedPreferences("mrsoft", MODE_PRIVATE);       String username= mrsoft.getString("username",null);//获取账号，默认值设为mr        String password= mrsoft.getString("password",null);        if(username!=null && password!=null)        {            qqzh.setText(username);            qqmm.setText(password);           // if (username.equals(mr)&&password.equals(mrsofts)) {             //   Intent intent = new Intent(qq2.this, duo.class);              //  startActivity(intent);            //}        }

 qqdl.setonClickListener(new VIEw.OnClickListener() {                @OverrIDe                public voID onClick(VIEw v) {                    String in_username = qqzh.getText().toString();                    String in_password = qqmm.getText().toString();                    SharedPreferences.Editor editor = mrsoft.edit();                    //if (in_username.equals(mr) && in_password.equals(mrsofts)) {                    editor.putString("username1", in_username);                    editor.putString("password1", in_password);                    Log.i("调试是否获取到", "执行到此");                    Intent intent = new Intent(qq2.this, duo.class);                    startActivity(intent);                    Toast.makeText(qq2.this, "已保存密码", Toast.LENGTH_SHORT).show();                    editor.commit();                    //}                    //else {                    //  Toast.makeText(qq2.this,"账号或密码错误",Toast.LENGTH_SHORT).show();                    //}                }            });        }

总结 对于Shared Preferences来说他出存储的位置在data/data目录下手机无法直接查看，而且以xml文件的方式存储到本地；xml文件如下所示

<?xml version='1.0' enCoding='utf-8' standalone='yes' ?><map><string name="specialtext">haJsdh><?//</string><string name="username">dsa</string><string name="password">dasdasd</string><int name="int" value="47" /><boolean name="or" value="true" /></map>

储存的步骤：
1.通过mrsoft = getSharedPreferences("mrsoft", MODE_PRIVATE);方法先获取到一个sharp对象
2.通过SharedPreferences.Editor editor = mrsoft.edit();获取到sharp的一个内部对象editor才能进行存储 *** 作
3.直接put即可，有点类似map集合前key后 valueeditor.putString("username1", in_username); editor.putString("password1", in_password);

读取的 *** 作：
1.通过mrsoft = getSharedPreferences("mrsoft", MODE_PRIVATE);方法先获取到一个sharp对象
2.这样即可String username= mrsoft.getString("username",null);//获取账号，默认值设为mr String password= mrsoft.getString("password",null);

通过IO流对象存储读取对象

public class jishi extends AppCompatActivity {   byte[] buffer=null;    file file;    private EditText jis;    private fileinputStream fis;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_jishi);        button baochun = findVIEwByID(R.ID.baochun);        jis = findVIEwByID(R.ID.ji);        file=new file(Environment.getExternalStorageDirectory(),"new.txt");        try {            fis = new fileinputStream(file);            buffer =new byte[fis.available()];            fis.read(buffer);        } catch (fileNotFoundException e) {            e.printstacktrace();        } catch (IOException e) {            e.printstacktrace();        }finally {            try {                fis.close();                String data=new String(buffer);                jis.setText(data);            } catch (IOException e) {                e.printstacktrace();            }        }        baochun.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw v) {                fileOutputStream fos=null;                String text= jis.getText().toString();                try {                    fos=new fileOutputStream(file);                    fos.write(text.getBytes());                    fos.flush();                    Toast.makeText(jishi.this,"保存成功",Toast.LENGTH_SHORT).show();                } catch (fileNotFoundException e) {                    e.printstacktrace();                    Toast.makeText(jishi.this,"文件不存在异常",Toast.LENGTH_SHORT).show();                } catch (IOException e) {                    e.printstacktrace();                    Toast.makeText(jishi.this,"io异常",Toast.LENGTH_SHORT).show();                }finally {                    if(fos!=null)                    {                        try {                            fos.close();                        } catch (IOException e) {                            e.printstacktrace();                        }                    }                }            }        });    }}

创建io对象：然后获取读取没什么区别，就是读取流中I有个

   fis = new fileinputStream(file);            buffer =new byte[fis.available()];            fis.read(buffer);

看这个片段，不再通过指定byte【1024】来指定了

总结

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