我在添加应用用户数据时遇到问题。该应用程序无法运行。 [英] I have a problem adding my apps user data. The application does not run.
问题描述
我创建了一个程序，它接受来自edittext的输入并使用Sharedpreferences存储它，当我按下retrive按钮时，它必须检索首先从编辑文本中获取的字符串。但该程序根本没有运行。
这是XML代码
< 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
工具：context =app.com.example.android.myapplication.MainActivity>
< edittext>
android：layout_width =match_parent
android：layout_height =wrap_content
android：hint =输入内容
android：id =@ + id / editText/>
<按钮
android：layout_width =wrap_content
android：layout_height =wrap_content
android： text =CLICK ME
android：id =@ + id / button
android：/>
<按钮
android：layout_width =wrap_content
android：layout_height =wrap_content
android：text =回复你写的
android：/>
java代码
包app.com.example.android.myapplication;
import android.app .Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app。 AppCompatActivity;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.View;
导入android.widget.Button;
impo rt android.widget.EditText;
导入android.widget.TextView;
导入android.widget.Toast;
公共类MainActivity扩展AppCompatActivity {
Button clickme;
EditText typeme;
String New;
String Next =Nothing;
SharedPreferences sharedPref = getPreferences（Context.MODE_PRIVATE）;
@覆盖
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_main）; < br $>
clickme =（按钮）findViewById（R.id.button）;
typeme =（EditText）findViewById（R.id.editText） ;
}
public void dosomething（查看视图）{
String textsomething = typeme.getText（）。toString（）;
Toast.makeText（this，texts omething +WORKS OK，Toast.LENGTH_LONG）。show（）;
SharedPreferences.Editor editor = sharedPref.edit（）;
。Log.i（MyActivity，editting opened）;
editor.putString（New，textsomething）;
编辑器。 commit（）;
Log.i（MyActivity，编辑结束）;
}
public void getsomething（查看视图）{
Next = sharedPref.getString（New，Next）.toString（）;
Log.i（MyActivity，Retrieving started ）;
Toast.makeText（this，Next +Retrived value Hurray，Toast.LENGTH_LONG）。show（）;
Log.i（MyActivity，检索完成华友世纪的作品）;
}
}
有些人请帮助我新手。提前致谢
我尝试过：
搜索它谷歌，但不能。
I have created a program that takes in a input from edittext and stores it using Sharedpreferences and when i press retrive button it must retrive the string what was first taken from edit text. But the program does not run at all.
This is the XML Code
<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="app.com.example.android.myapplication.MainActivity">
<edittext>
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Type something"
android:id="@+id/editText" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CLICK ME"
android:id="@+id/button"
android:/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Retrive what you wrote"
android:/>
The java code
package app.com.example.android.myapplication;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button clickme;
EditText typeme;
String New;
String Next = "Nothing";
SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
clickme = (Button) findViewById(R.id.button);
typeme = (EditText) findViewById(R.id.editText);
}
public void dosomething(View view) {
String textsomething = typeme.getText().toString();
Toast.makeText(this, textsomething + "WORKS OK", Toast.LENGTH_LONG).show();
SharedPreferences.Editor editor = sharedPref.edit();
Log.i("MyActivity", "editting opened");
editor.putString(New, textsomething);
editor.commit();
Log.i("MyActivity", "editing over");
}
public void getsomething(View view) {
Next = sharedPref.getString(New, Next).toString();
Log.i("MyActivity", "Retrieving started");
Toast.makeText(this, Next + "Retrived value Hurray", Toast.LENGTH_LONG).show();
Log.i("MyActivity", "Retrieving done Hurray works");
}
}
Some please help as im newbie. Thanks in advance
What I have tried:
searching for it google but could not.
推荐答案
您的代码中没有任何内容可以调用方法来完成实际工作。我建议你阅读在Android上处理输入和存储 [ ^ ]，它解释了这样做。
There is nothing in your code to call the methods to do the actual work. I suggest you read Handling Input and Storage on Android[^], which explains how to do it.
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