0

我希望在安装我的应用程序后第一次出现免责声明！为此，在我的 MainActivity 中，我制作了 2 个按钮：第一个“同意”按钮将在 Shared Preference 中存储布尔值“true”，并将其重定向到 Welcome.class 中的 u！第二个按钮将终止应用程序！这种情况应该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 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);
         }
     }
}

activity_main.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: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>

Welcome.java 代码：

    public class Welcome extends Activity
    {
      @Override
     protected void onCreate(Bundle savedInstanceState) 
     {
         super.onCreate(savedInstanceState);
                 setContentView(R.layout.welcome);
             TextView iv = (TextView)findViewById(R.id.textView1);

     }
}

欢迎.xml

<?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" />

这是 AndroidManifest.xml 代码：

<?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>

日志猫：

10-13 07:23:30.069: E/AndroidRuntime(3356): 致命异常: main 10-13 07:23:30.069: E/AndroidRuntime(3356): android.content.ActivityNotFoundException: 找不到明确的活动类 {com .example.disclaimer1/com.example.disclaimer1.Welcome}; 您是否在 AndroidManifest.xml 中声明了此活动？10-13 07:23:30.069: E/AndroidRuntime(3356): 在 android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1628) 10-13 07:23:30.069: E/AndroidRuntime(3356): 在 android. app.Instrumentation.execStartActivity(Instrumentation.java:1424) 10-13 07:23:30.069: E/AndroidRuntime(3356): 在 android.app.Activity.startActivityForResult(Activity.java:3390) 10-13 07:23: 30.069: E/AndroidRuntime(3356): 在 android.app.Activity.startActivityForResult(Activity.java:3351) 10-13 07:23:30.069: E/AndroidRuntime(3356): 在 android.

4

3 回答 3

1

确保在AndroidManifest.xml文件中声明欢迎活动。

最终答案

好的，这不是最优雅的方法，但它会让你开始。之后，我建议您调查带有长文本的“确定/取消”对话框，并使用其中一个而不是两个活动。

主要活动

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();
    }
}
于 2013-10-13T09:59:48.243 回答
0

只是您首先必须在 `Sharedpreference 中设置值，然后才能访问它。

尝试如下：

 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;
     }
于 2013-10-13T10:57:29.370 回答
0

在分配价值之前，您不会从 sharedprefs 中获得价值。您没有为“协议”变量赋值，您如何从中获得价值？会是这样；

@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);
         }
     }
}
于 2013-10-13T11:11:03.913 回答