Preferences

SharedPreferences

这次的作业是利用SharedPreferences将姓名和年龄保存到文件，再读取：
在XML中定义如下：

接下来用使用SharedPreferenxes保存数据：
1）获取SharedPreferenxes对象，使用getSharedPreferenxes(String name,int mode)方法获取；
2）保存SharedPreferenxes数据，通过Editor对象putXxx方法保存；
3）读取SharedPreferenxes数据，即String name = pref.getString("name",mingzi.getText().toString());

public class MainActivity extends AppCompatActivity {
private Button xieru;
private EditText mima;
private EditText mingzi;
private SharedPreferences.Editor editor;
private SharedPreferences pref;
private Button duqu;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); mingzi = (EditText)findViewById(R.id.edit1);
mima=(EditText)findViewById(R.id.edit2);
pref = getSharedPreferences("xieru",MODE_PRIVATE);
editor = pref.edit();
duqu=(Button)findViewById(R.id.duqu);
xieru=(Button)findViewById(R.id.xieru);
xieru.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"保存成功",Toast.LENGTH_LONG).show();
editor.putString("name",mingzi.getText().toString());
editor.putString("password",mima.getText().toString());
editor.commit();

}
});
duqu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name = pref.getString("name",mingzi.getText().toString());
String password=pref.getString("password",mima.toString());
Toast.makeText(MainActivity.this,"姓名是"+name+"年龄是:"+password,Toast.LENGTH_LONG).show();
}
});
}

}