Android 如何从另一个类访问共享首选项布尔值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/10606237/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to access shared preference boolean value from another class
提问by deucalion0
I have created a radio group which contains two buttons, I can select one and save it, it works fine, still stored after closing the app. What I want to do is use the value of the radio buttons in another class. Here is my settings class which contains the shared preferences code:
我创建了一个包含两个按钮的单选组，我可以选择一个并保存它，它工作正常，关闭应用程序后仍然存储。我想要做的是在另一个类中使用单选按钮的值。这是我的设置类，其中包含共享首选项代码：
public class Settings extends Activity {
private String settingsTAG = "AppNameSettings";
private SharedPreferences prefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
prefs = getSharedPreferences(settingsTAG, 0);
final RadioButton rb0 = (RadioButton) findViewById(R.id.radioInternetYes);
final RadioButton rb1 = (RadioButton) findViewById(R.id.radioInternetNo);
rb0.setChecked(prefs.getBoolean("rb0", true));
rb1.setChecked(prefs.getBoolean("rb1", false));
Button btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
prefs = getSharedPreferences(settingsTAG, 0);
Editor editor = prefs.edit();
editor.putBoolean("rb0", rb0.isChecked());
editor.putBoolean("rb1", rb1.isChecked());
editor.commit();
finish();
}
} );
}
In another class I am trying to check if rb0 is true or false when clicking a button:
在另一堂课中，我试图在单击按钮时检查 rb0 是真还是假：
share.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
if(rb0 = true){
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_EMAIL , new String[]{""});
i.putExtra(Intent.EXTRA_SUBJECT, "Check out my awesome score!");
i.putExtra(Intent.EXTRA_TEXT , "I am playing this awesome game called Tap the Button, and I just scored the incredible highscore of " +s+ " Taps!!\n\nCan you beat it!?");
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(FailScreen.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
}
else{
//Display warning that rb0 is false
}
}
});
I have researched Stackoverflow and the developer documentation, but I cant seem to find out how this can be done, any advice is appreciated.
我已经研究了 Stackoverflow 和开发人员文档，但我似乎无法找到如何做到这一点，任何建议表示赞赏。
Thank you
谢谢
回答by Jon
Instead of if(rb0 = true)(which should be ==anyways), you need to access the SharedPreferences again. Quoted from http://developer.android.com/guide/topics/data/data-storage.html:
而不是if(rb0 = true)（==无论如何应该是），您需要再次访问 SharedPreferences 。引自http://developer.android.com/guide/topics/data/data-storage.html：
To read values, use SharedPreferences methods such as getBoolean() and getString().
要读取值，请使用 SharedPreferences 方法，例如 getBoolean() 和 getString()。
So you would use something like:
所以你会使用类似的东西：
String settingsTAG = "AppNameSettings";
SharedPreferences prefs = getSharedPreferences(settingsTAG, 0);
boolean rb0 = prefs.getBoolean("rb0", false);
if(rb0 == true){
// Do something
}
回答by CommonSenseCode
You can also use:
您还可以使用：
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
sharedPreferences.getBoolean("myKey", false)
