android 数据存取——SharedPreferences
2015-09-09 15:42
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SharedPreferences是android轻量级存储数据的工具,具体用法如下示例:
public class SharedPreferenceTestActivity extends ActionBarActivity {
private TextView showDataText=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shared_preference_test);
showDataText=(TextView)findViewById(R.id.show_user_data);
}
//显示数据
public void showUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
String str=sp.getInt("userId",-1)+" "+sp.getString("name","***")+" "+
sp.getInt("age",-1)+" "+sp.getFloat("money",0);
showDataText.setText(str);
}
//保存数据
public void saveUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
SharedPreferences.Editor editorSp = sp.edit();
editorSp.putInt("userId", 100);
editorSp.putString("name", "xiaoli");
editorSp.putInt("age", 25);
editorSp.putFloat("money", 800);
editorSp.commit();
}
//清除数据
public void clearUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
editor.commit();
}
//更新数据
public void updateUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
SharedPreferences.Editor editorSp = sp.edit();
editorSp.putInt("age", 39);
editorSp.putFloat("money", 1800);
editorSp.commit();
}
}
布局文件如下:
<LinearLayout 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:orientation="vertical"
android:gravity="center_horizontal"
tools:context="liyang.com.myapptest.SharedPreferenceTestActivity">
<TextView
android:id="@+id/show_user_data"
android:gravity="center"
android:text="数据显示"
android:textColor="#000000"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:onClick="showUserInfo"
android:text="显示用户信息"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:onClick="saveUserInfo"
android:text="保存用户信息"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:onClick="updateUserInfo"
android:text="更新用户信息"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:onClick="clearUserInfo"
android:text="清楚用户信息"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
public class SharedPreferenceTestActivity extends ActionBarActivity {
private TextView showDataText=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shared_preference_test);
showDataText=(TextView)findViewById(R.id.show_user_data);
}
//显示数据
public void showUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
String str=sp.getInt("userId",-1)+" "+sp.getString("name","***")+" "+
sp.getInt("age",-1)+" "+sp.getFloat("money",0);
showDataText.setText(str);
}
//保存数据
public void saveUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
SharedPreferences.Editor editorSp = sp.edit();
editorSp.putInt("userId", 100);
editorSp.putString("name", "xiaoli");
editorSp.putInt("age", 25);
editorSp.putFloat("money", 800);
editorSp.commit();
}
//清除数据
public void clearUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
editor.commit();
}
//更新数据
public void updateUserInfo(View view){
SharedPreferences sp = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
SharedPreferences.Editor editorSp = sp.edit();
editorSp.putInt("age", 39);
editorSp.putFloat("money", 1800);
editorSp.commit();
}
}
布局文件如下:
<LinearLayout 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:orientation="vertical"
android:gravity="center_horizontal"
tools:context="liyang.com.myapptest.SharedPreferenceTestActivity">
<TextView
android:id="@+id/show_user_data"
android:gravity="center"
android:text="数据显示"
android:textColor="#000000"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:onClick="showUserInfo"
android:text="显示用户信息"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:onClick="saveUserInfo"
android:text="保存用户信息"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:onClick="updateUserInfo"
android:text="更新用户信息"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:onClick="clearUserInfo"
android:text="清楚用户信息"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
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