java Android SharedPreferences 示例
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Android SharedPreferences Example
提问by EGHDK
I'm trying to learn SharedPreferences, but I'm getting an error.
我正在尝试学习 SharedPreferences，但出现错误。
My layout has one button that reeacts to the method doThis
我的布局有一个按钮可以对方法做出反应 doThis
This is my java:
这是我的java：
package com.example.sharedprefs;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
int i = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void doThis (View view){
i++;
SharedPreferences sharedPref = getSharedPreferences("FileName",MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sharedPref.edit();
prefEditor.putInt("userChoice",i);
prefEditor.commit();
int number = sharedPref.getInt("userChoice", 0);
Toast.makeText(getApplicationContext(), number, Toast.LENGTH_LONG).show();
}
}
Only thing I can pinpoint in logcat is 10-15 19:28:17.707: E/AndroidRuntime(16657): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
我唯一可以在 logcat 中指出的是 10-15 19:28:17.707: E/AndroidRuntime(16657): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
回答by ahodder
Your toast is incorrect. You are passing a number into the toast hoping that it will give a string, instead is thinks it should be looking up a string resource value. Try:
你的吐司不正确。您将一个数字传递到 toast 中，希望它会给出一个字符串，而不是认为它应该查找字符串资源值。尝试：
Toast.makeText(getContext(), number + "" , Toast.LENGTH_LONG).show();
Edit, other than that, your code is fine.
编辑，除此之外，您的代码很好。
回答by Dan Lee
You can't make a integer type to Toast message.
您不能为 Toast 消息创建整数类型。
you can only put String type to the message parameter to Toast.makeText method.
您只能将 String 类型添加到 Toast.makeText 方法的消息参数中。
as for solution, you can try these
至于解决方案，你可以试试这些
Toast.makeText(getApplicationContext(), Integer.toString(number), Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), ""+number, Toast.LENGTH_LONG).show();
and yes, your sharedpreference usage is perfectly fine.
是的，您的 sharedpreference 用法非常好。
回答by Kashfa Khan
The problem here is you are using an integer value as the Toast string. You have to do the following.
这里的问题是您使用整数值作为 Toast 字符串。您必须执行以下操作。
String.valueOf(number);
or
或者
Integer.toString(number);
Your sharedpreferences part is ok. But for more info about SharedPreferences you can visit this post. Android SharedPreferences Example
您的共享首选项部分没问题。但是有关 SharedPreferences 的更多信息，您可以访问这篇文章。 Android SharedPreferences 示例
