SharedPreferences DEMO

简单演示一下SharedPreference在程序中的应用：

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"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context=".MainActivity" >

    <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/hello_world" />     <Button         android:id="@+id/button"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="跳转"/>     <TextView         android:id="@+id/text"         android:layout_height="wrap_content"         android:layout_width="wrap_content"         android:layout_centerInParent="true"         android:text=""/>     </RelativeLayout>

两个activity的跳转只是演示一个text的值的获取就随便设置了一下textview的可见或者不可见

第一个activity：

public class MainActivity extends Activity implements OnClickListener {
 SharedPreferences share;
 Editor edit;
 String str;
 static String strValue = "测试";
 Button button;
 TextView text;
 /* (non-Javadoc)
  * @see android.app.Activity#onCreate(android.os.Bundle)
  */

@Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  button = (Button)findViewById(R.id.button);
  button.setOnClickListener(this);
  text = (TextView)findViewById(R.id.text);
  text.setVisibility(View.INVISIBLE);
  share = this.getSharedPreferences("name",Context.MODE_WORLD_WRITEABLE);
  str = share.getString("name", strValue);
  edit = share.edit();
  setString();
 }
 private void setString(){
  edit.putString("name", strValue);
  edit.commit();
 }
 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  Intent intent = new Intent();
  intent.setClass(getApplicationContext(), ValueActivity.class);
  startActivity(intent);
  finish();
  System.exit(0);
 }
} 

另一个activity当中获得共享的key -- value值

public class ValueActivity extends Activity {
 SharedPreferences share;
 String str;
 TextView text;
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  text = (TextView)findViewById(R.id.text);
  text.setVisibility(View.VISIBLE);
  Editor edit = this.getSharedPreferences("name", Context.MODE_WORLD_WRITEABLE).edit();
  str = this.getSharedPreferences("name", Context.MODE_WORLD_WRITEABLE).getString("name", MainActivity.strValue);
  text.setText(str);
 }
}

最后是酱紫的：