运行完后,可以在DDMS,看到这个xml文件
MainActivity.java
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); } } }
activity_main.xml
<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>
别的应用程序来读取这个xml
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(); }
MODE_WORLD_READABLE和MODE_WORLD_WRITEABLE已经在Android 4.2(API level 17)废弃了,因为这样危险,安全性不高。
时间: 2024-10-15 00:34:03