Android 操作共享首选项时出错？
我希望免责声明在安装我的应用程序后第一次出现！ 在我的主要活动中，我有两个按钮：第一个“同意”按钮将在共享首选项中存储布尔值“真”值，并将其重定向到Welcome.class中的u！第二个按钮将终止应用程序！ 此情况应在安装应用程序后第一次出现！ 我找不到我的错误 MainActivity.java代码：Android 操作共享首选项时出错？,android,sharedpreferences,Android,Sharedpreferences,我希望免责声明在安装我的应用程序后第一次出现！ 在我的主要活动中，我有两个按钮：第一个“同意”按钮将在共享首选项中存储布尔值“真”值，并将其重定向到Welcome.class中的u！第二个按钮将终止应用程序！ 此情况应在安装应用程序后第一次出现！ 我找不到我的错误 MainActivity.java代码： public class MainActivity extends Activity implements OnClickListener {public static
public class MainActivity extends Activity implements OnClickListener
{public static String filename = "MySharedString";
SharedPreferences settings;
Button agree,disagree;
public static final String PREFS_NAME = "MyPrefsFile";
@Override
protected void onCreate(Bundle state)
{
super.onCreate(state);
setContentView(R.layout.activity_main);
TextView text1=(TextView)findViewById(R.id.txt1);
TextView text2 = (TextView)findViewById(R.id.txt2);
text2.setText("Android custom dialog example!");
ImageView image = (ImageView)findViewById(R.id.imageView1);
image.setImageResource(R.drawable.ic_launcher);
Button agreeButton = (Button)findViewById(R.id.button1);
Button disagreeButton = (Button)findViewById(R.id.button2);
agreeButton.setOnClickListener(this);
disagreeButton.setOnClickListener(this);
settings = getSharedPreferences(filename, 0);
}
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.button1:
SharedPreferences settings = getSharedPreferences(filename, 0);
boolean agreement = settings.getBoolean("agreement",false);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("agreement", true);
editor.commit();
Intent i=new Intent(getApplicationContext(),Welcome.class);
startActivity(i);
break;
case R.id.button2:
finish();
System.exit(0);
}
}
}
<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:background="#d3d3d3"
tools:context=".MainActivity" >
<TextView
android:id="@+id/txt1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Disclaimer"
android:gravity="center"
android:textSize="20dp"
android:layout_marginTop="5dp"/>
<TextView
android:id="@+id/txt2"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="This is a Disclaimer."
android:textSize="10dp"
android:layout_marginTop="10dp"
android:layout_below="@+id/txt1"/>
<Button
android:id="@+id/button2"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_marginLeft="37dp"
android:layout_toRightOf="@+id/button1"
android:text="DisAgree" />
<Button
android:id="@+id/button1"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/txt2"
android:layout_marginLeft="46dp"
android:text="Agree" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignTop="@+id/txt1"
android:layout_marginLeft="28dp"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="WELCOME !"
android:textAppearance="?android:attr/textAppearanceLarge" />
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.disclaimer1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.disclaimer1.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.disclaimer1.Welcome"></activity>
</application>
</manifest>
10-13 07:23:30.069:E/AndroidRuntime（3356）：在dalvik.system.NativeStart.main（本机方法）确保在AndroidManifest.xml文件中声明您的欢迎活动 最终答案 好吧，这不是最优雅的方式，但它会让你开始。之后，我建议您研究带有长文本的Ok/Cancel对话框，并使用其中一个而不是两个活动 main活动
public class MainActivity extends Activity implements OnClickListener
{
public static String filename = "MySharedString";
public static final String PREFS_NAME = "MyPrefsFile";
@Override
protected void onCreate(Bundle state)
{
super.onCreate(state);
setContentView(R.layout.main);
TextView text1=(TextView)findViewById(R.id.txt1);
TextView text2 = (TextView)findViewById(R.id.txt2);
text2.setText("Android custom dialog example!");
ImageView image = (ImageView)findViewById(R.id.imageView1);
image.setImageResource(R.drawable.ic_launcher);
Button agreeButton = (Button)findViewById(R.id.button1);
Button disagreeButton = (Button)findViewById(R.id.button2);
agreeButton.setOnClickListener(this);
disagreeButton.setOnClickListener(this);
boolean agree = getSharedPreferences(filename, 0).getBoolean("agreement", false);
if(agree)
{
openWelcome();
}
}
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.button1:
SharedPreferences settings = getSharedPreferences(filename, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("agreement", true);
editor.commit();
openWelcome();
break;
case R.id.button2:
finish();
}
}
private void openWelcome()
{
Intent i=new Intent(this, Welcome.class);
startActivity(i);
finish();
}
}
只是您首先必须在`SharedReference'中设置值，然后才可以访问它 请尝试以下操作：
switch (v.getId())
{
case R.id.button1:
//Add the value in Sharepreference
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("agreement", true);
editor.commit();
//Get the value from it.
SharedPreferences settings = getSharedPreferences(filename, 0);
boolean agreement = settings.getBoolean("agreement",false);
Intent i=new Intent(getApplicationContext(),Welcome.class);
startActivity(i);
break;
}
在赋值之前，您不会从sharedprefs获取值。您没有为“协议”变量赋值，如何从中获取值？就是这样,
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.button1:
SharedPreferences settings = getSharedPreferences(filename, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("agreement", true);
editor.commit();
//now you can get value of agreement
boolean agreement = settings.getBoolean("agreement",false);
Intent i=new Intent(getApplicationContext(),Welcome.class);
startActivity(i);
break;
case R.id.button2:
finish();
System.exit(0);
}
}
}
那么现在发生了什么？为什么要使用getApplicationContext（）启动活动？您遇到了什么错误？你说你得到了错误，但没有说它是什么。错误出现在第一个方法case R.id.button1的onClick中：这种情况下缺少一些代码，不知道如何解决它！是的，我刚刚通过这行在清单中声明了它：然后它也显示了相同的错误错误错误：10-13 07:17:35.639:E/AndroidRuntime（3313）：android.content.ActivityNotFoundException:找不到显式活动类{com.example.disclaimer1/com.example.disclaimer1.Welcome}；您是否在AndroidManifest.xml中声明了此活动？10-13 07:17:35.639:E/AndroidRuntime（3313）：在dalvik.system.NativeStart.main（本机方法）中还包含完整的包名'ya它在正确的目录中，我在工作空间中检查了它两个java文件都在src/com/example/disclaimer1ok中，该应用程序运行平稳，但我希望在单击“同意”按钮后，我返回并再次打开免责声明1！应该只有欢迎屏幕应用程序运行顺利，但我希望在单击同意按钮后，我返回并再次打开免责声明1！应该只有欢迎屏幕
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.button1:
SharedPreferences settings = getSharedPreferences(filename, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("agreement", true);
editor.commit();
//now you can get value of agreement
boolean agreement = settings.getBoolean("agreement",false);
Intent i=new Intent(getApplicationContext(),Welcome.class);
startActivity(i);
break;
case R.id.button2:
finish();
System.exit(0);
}
}
}