public class MainActivity extends Activity implements OnClickListener{    EditText editText1;    TextView textView3;    SharedPreferences pre;    Editor editor;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                editText1=(EditText)findViewById(R.id.editText1);        textView3=(TextView)findViewById(R.id.textView3);                pre=getSharedPreferences("myPre222", Context.MODE_WORLD_READABLE+Context.MODE_WORLD_WRITEABLE);        editor=pre.edit();                Button btn1=(Button)findViewById(R.id.button1);        Button btn2=(Button)findViewById(R.id.button2);        btn1.setOnClickListener(this);        btn2.setOnClickListener(this);    }    public void onClick(View v) {        if(v==findViewById(R.id.button1)){            editor.putString("name", editText1.getText()+"");            editor.commit();        }else if(v==findViewById(R.id.button2)){            String name=pre.getString("name", "");            textView3.setText(name);        }    }}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="${relativePackage}.${activityClass}" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/editText1"        android:layout_alignBottom="@+id/editText1"        android:layout_alignParentLeft="true"        android:text="姓名"        android:textAppearance="?android:attr/textAppearanceLarge" />    <EditText        android:id="@+id/editText1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_marginLeft="15dp"        android:layout_marginTop="15dp"        android:layout_toRightOf="@+id/textView1"        android:ems="10" >        <requestFocus />    </EditText>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/editText1"        android:layout_marginTop="22dp"        android:text="写入" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/button1"        android:layout_marginTop="36dp"        android:text="读取" />    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/button2"        android:layout_alignBottom="@+id/button2"        android:layout_marginLeft="11dp"        android:layout_toRightOf="@+id/button2"        android:text="值："        android:textAppearance="?android:attr/textAppearanceLarge" />    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView2"        android:layout_alignBottom="@+id/textView2"        android:layout_centerHorizontal="true"        android:textAppearance="?android:attr/textAppearanceLarge" /></RelativeLayout>

try {                    Context context=createPackageContext("com.example.fffff", Context.CONTEXT_IGNORE_SECURITY);                    SharedPreferences pre=context.getSharedPreferences("myPre222", Context.MODE_WORLD_READABLE+Context.MODE_WORLD_WRITEABLE);                    String name=pre.getString("name", "");                    Toast.makeText(MainActivity.this, name, Toast.LENGTH_SHORT).show();                } catch (NameNotFoundException e) {                    // TODO 自动生成的 catch 块                    e.printStackTrace();                }