上篇文章介绍了SharedPreferences读写问题。这里介绍下如何在不同的activity中访问SharedPreferences,以及如何直接访问任何可以访问的SharedPreferences。比如对于上篇文章方法3存储的SharedPreferences如何在Activity中进行访问
1、不同Activity中访问SharedPreferences
这个比较简单,同在一个Activity中一样,比如在A Activity中
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); SharedPreferences.Editor editor = settings.edit(); editor.putBoolean("silentMode", mSilentMode); editor.commit(); //一定要记得提交
在B Activity中需要获得silentMode对应的值。只需要
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); //或者使用 SharedPreferences settings = getPreferences(0); boolean silent = settings.getBoolean("silentMode", false);
2、用android.preference.Preference.getSharedPreferences()存储的SharedPreferences如何在Activity中进行访问
如在一个继承了ListPreference的类中
public void setValue(String value) { SharedPreferences settings = getSharedPreferences(); SharedPreferences.Editor editor = settings.edit(); editor.putString(SNSWEBSITESELECTEDNAME, value); editor.commit(); }
我们在一个Activity中如何获得这里面保存的SharedPreferences呢。
这里我们再次了解下SharedPreferences的实质,SharedPreferences实际是采用了XML格式将数据存储到设备中,在DDMS中的File Explorer中的/data/data/<package name>/shares_prefs下。而getSharedPreferences (String name, int mode)的name为preferences file名,所以说我们只要能得到上面getSharedPreferences()保存的SharedPreferences名就可以获取其保存的SharedPreferences了。
public String getValue() { SharedPreferences settings = getSharedPreferences(); String preferencesName = this.getPreferenceManager().getSharedPreferencesName(); return settings.getString(SNSWEBSITESELECTEDNAME, ""); }
注意第三行的preferencesName值,他就表示SharedPreferences的全名。如我们得到的是com.aaa.bb.activity_preferences,那么我们直接在activity中就可以得到该值
SharedPreferences settings = getSharedPreferences("com.aaa.bb.activity_preferences", 0); String savaString = settings.getString(SNSWEBSITESELECTEDNAME, "");
参考:
http://stackoverflow.com/questions/2614719/how-do-i-get-the-sharedpreferences-from-a-preferenceactivity-in-android
To get a ProgressBar in the default theme that is to be used on white/light back ground, use one of the inverse styles:
<ProgressBar />
<ProgressBar />
<ProgressBar />
进度条
<ProgressBar android:layout_width="fill_parent" android:layout_height="wrap_content" />
一、通过动画实现
定义res/anim/loading.xml如下:
<?xml version="1.0" encoding="UTF-8"?>
<animation-list android:oneshot="false"
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:duration="150" android:drawable="@drawable/loading_01" />
<item android:duration="150" android:drawable="@drawable/loading_02" />
<item android:duration="150" android:drawable="@drawable/loading_03" />
<item android:duration="150" android:drawable="@drawable/loading_04" />
<item android:duration="150" android:drawable="@drawable/loading_05" />
<item android:duration="150" android:drawable="@drawable/loading_06" />
<item android:duration="150" android:drawable="@drawable/loading_07" />
</animation-list>
在layout文件中引用如下:
<ProgressBar android:id="@+id/loading_process_dialog_progressBar"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false" android:indeterminateDrawable="@anim/loading" />
二、通过自定义颜色实现
定义res/drawable/dialog_style_xml_color.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"
android:toDegrees="360">
<shape android:shape="ring" android:innerRadiusRatio="3"
android:thicknessRatio="8" android:useLevel="false">
<gradient android:type="sweep" android:useLevel="false"
android:startColor="#FFFFFF" android:centerColor="#FFDC35"
android:centerY="0.50" android:endColor="#CE0000" />
</shape>
</rotate>
在layout文件中引用如下:
<ProgressBar android:id="@+id/loading_process_dialog_progressBar"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_color" />
三、使用一张图片进行自定义
定义res/drawable/dialog_style_xml_icon.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<rotate android:drawable="@drawable/dialog_progress_round"
android:fromDegrees="0.0" android:toDegrees="360.0" android:pivotX="50.0%"
android:pivotY="50.0%" />
</item>
</layer-list>
在layout文件中引用如下:
<ProgressBar android:id="@+id/loading_process_dialog_progressBar"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_icon" />
main.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:gravity="center"
android:background="#FFF">
<Button android:text="@string/anim" android:id="@+id/anim"
android:layout_width="120dip" android:layout_height="wrap_content" />
<Button android:text="@string/color" android:id="@+id/color"
android:layout_width="120dip" android:layout_height="wrap_content" />
<Button android:text="@string/icon" android:id="@+id/icon"
android:layout_width="120dip" android:layout_height="wrap_content" />
</LinearLayout>
void f(){
Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
int orientation = display.getOrientation();
switch(orientation){
case Configuration.ORIENTATION_PORTRAIT:
//....
break;
case Configuration.ORIENTATION_LANDSCAPE:
//...
break;
default :
//...
break;
}
}