使用SharedPreferences保存和读取数据

tSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sp=getSharedPreferences("spTest", Context.MODE_PRIVATE);
SharedPreferences.Editor edit=sp.edit();
edit.putString("userName",etUser.getText().toString());
edit.commit();
Toast.makeText(v.getContext(),"保存成功",Toast.LENGTH_SHORT).show();
}
});

btRead.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sp=getSharedPreferences("spTest", Context.MODE_PRIVATE);
String name=sp.getString("userName","没有数据");
showInfo.setText(name);
}
});