Question

这里是mainactivity.java

public class MainActivity extends Activity {
Button iol;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    iol=(Button)findViewById(R.id.iolCalculation);
    try{
        iol.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent iolIntent=new Intent(MainActivity.this,Selection.class);
                startActivity(iolIntent);
            }
        });
    }finally{

    }

}

这是我的主要xml，其中点击了id = button1的按钮

    <FrameLayout 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="@color/black"
    tools:context=".FullscreenActivity" 
    android:id="@+id/frame_layout">

        <LinearLayout
            android:id="@+id/fullscreen_content_controls"
            style="@style/ButtonBar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center_horizontal"
            android:background="@color/black_overlay"
            android:orientation="horizontal"
            tools:ignore="UselessParent" >
        </LinearLayout>

        <Button
            style="@style/ButtonBarButton"
            android:layout_width="222dp"
            android:layout_height="62dp"
            android:layout_marginLeft="45dp"
            android:layout_marginTop="75dp"
            android:background="@color/black"
            android:paddingLeft="20dp"
            android:id="@+id/iolCalculation"
            android:text="@string/Button"
            android:textColor="@color/WhiteSmoke"
            android:textStyle="bold" />

        <Button
            style="@style/ButtonBarButton"
            android:layout_width="222dp"
            android:layout_height="62dp"
            android:layout_marginLeft="45dp"
            android:id="@+id/sHelp"
            android:layout_marginTop="139dp"
            android:background="@color/Black"
            android:gravity="center"
            android:paddingLeft="10dp"
            android:text="@string/Button1"
            android:textColor="@color/WhiteSmoke"
            android:textStyle="bold" />

        <Button
            style="@style/ButtonBarButton"
            android:layout_width="222dp"
            android:layout_height="62dp"
            android:id="@+id/sAbout"
            android:layout_marginLeft="45dp"
            android:layout_marginTop="203dp"
            android:background="@color/Black"
            android:paddingLeft="10dp"
            android:text="@string/Button2"
            android:textColor="@color/WhiteSmoke"
            android:textStyle="bold" >

        </Button>
</FrameLayout>

这里是我的第二个xml布局，当点击button1时，它将与它的内容一起显示

   <?xml version="1.0" encoding="utf-8"?>
   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/black"
    android:orientation="vertical" 
    android:id="@+id/form_layout">

    <Spinner
        android:id="@+id/formulae"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:background="@color/LightSkyBlue"
        android:prompt="@string/prompt"
        android:entries="@array/formulas" />

    <TextView
        android:id="@+id/k2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/k1"
        android:layout_below="@+id/k1"
        android:layout_marginTop="38dp"
        android:text="@string/K2"
        android:textColor="@color/White"
        android:textSize="25sp" />

    <TextView
        android:id="@+id/al_const"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/al"
        android:layout_below="@+id/al"
        android:layout_marginTop="44dp"
        android:text="@string/Rx"
        android:textColor="@color/White"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/al"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/k2"
        android:layout_below="@+id/k2"
        android:layout_marginTop="38dp"
        android:text="@string/AL"
        android:textColor="@color/White"
        android:textSize="25sp" />

    <EditText
        android:id="@+id/k2_editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/al"
        android:layout_alignRight="@+id/al_editText"
        android:layout_alignTop="@+id/k2"
        android:layout_marginLeft="120dp"
        android:background="@color/black"
        android:ems="10"
        android:inputType="numberDecimal"
        android:textColorLink="@color/white" />

    <EditText
        android:id="@+id/al_editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/formulae"
        android:layout_alignTop="@+id/al"
        android:layout_marginLeft="120dp"
        android:ems="10"
        android:inputType="numberDecimal" />

    <EditText
        android:id="@+id/al_const_editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/al_const"
        android:layout_alignRight="@+id/al_editText"
        android:layout_marginLeft="120dp"
        android:ems="10"
        android:inputType="numberDecimal" />

    <Button
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:background="@color/LightSkyBlue"
        android:text="@string/Result" />

    <EditText
        android:id="@+id/k1_editText"
        android:layout_width="wrap_content"
        android:layout_height="37dp"
        android:layout_alignLeft="@+id/k2_editText"
        android:layout_alignRight="@+id/formulae"
        android:layout_below="@+id/formulae"
        android:layout_marginTop="30dp"
        android:background="@color/black"
        android:ems="10"
        android:inputType="numberDecimal"
        android:textColorLink="@color/White" />

    <TextView
        android:id="@+id/k1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/k1_editText"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="27dp"
        android:text="@string/K1"
        android:textColor="@color/white"
        android:textSize="25sp" />

</RelativeLayout>

清单文件

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.iolcalci"
    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.iolcalci.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="Selection"
            android:exported="false"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/app_name">
                <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
          </intent-filter>
        </activity>
    </application>

</manifest>

logcat，用于在选择类中使用setcontentview

    12-24 08:13:52.456: E/AndroidRuntime(766): FATAL EXCEPTION: main
12-24 08:13:52.456: E/AndroidRuntime(766): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.iolcalci/com.example.iolcalci.Selection}: android.content.res.Resources$NotFoundException: Resource ID #0x7f090005 type #0x12 is not valid
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.os.Looper.loop(Looper.java:137)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.ActivityThread.main(ActivityThread.java:5039)
12-24 08:13:52.456: E/AndroidRuntime(766):  at java.lang.reflect.Method.invokeNative(Native Method)
12-24 08:13:52.456: E/AndroidRuntime(766):  at java.lang.reflect.Method.invoke(Method.java:511)
12-24 08:13:52.456: E/AndroidRuntime(766):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-24 08:13:52.456: E/AndroidRuntime(766):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-24 08:13:52.456: E/AndroidRuntime(766):  at dalvik.system.NativeStart.main(Native Method)
12-24 08:13:52.456: E/AndroidRuntime(766): Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f090005 type #0x12 is not valid
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.content.res.Resources.loadXmlResourceParser(Resources.java:2144)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.content.res.Resources.getLayout(Resources.java:853)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-24 08:13:52.456: E/AndroidRuntime(766):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.Activity.setContentView(Activity.java:1881)
12-24 08:13:52.456: E/AndroidRuntime(766):  at com.example.iolcalci.Selection.onCreate(Selection.java:12)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.Activity.performCreate(Activity.java:5104)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-24 08:13:52.456: E/AndroidRuntime(766):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-24 08:13:52.456: E/AndroidRuntime(766):  ... 11 more

执行上述代码后，我可以看到显示空白布局。怎么样我应该从第二个显示微调器，textview，editbox等单击button1后的xml。

Answer 1

in androidmainfest.xml just write <activity
            android:name="Selection"></activity>
instead of
 <activity
            android:name="Selection"
            android:exported="false"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/app_name">
                <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
          </intent-filter>
        </activity>

Answer 2

如果您尝试使用新视图和XML移动到另一个屏幕，则需要引用创建扩展Activity类的新Java类。其中setContentView()方法会将参数作为R.layout.somexml，它将放置在 res 的布局目录中。要了解更多信息，请阅读以下链接。

Answer 3

您正尝试使用两个不同的屏幕创建小型应用程序

here is simple tutorial to Achieve this

所以你需要..

项目中的两项活动

MainActivity.java
Selection.java

两个布局文件

activity_main.xml
activity_second.xml

看你的Selection.java（Activity）文件应该是这样的，来处理微调器

public class Selection extends Activity implements OnItemSelectedListener {

    private Spinner spinner = null;

    // to show the list in spinner we need to create a list of items
    private String[] androidBooks = { "Hello, Android", "Professional Android",
            "Unlocking Android", "Android App Development", "Pro Android",
            "Beginning Android ", "Android Programming Tutorials",
            "Android Wireless App Development", "Pro Android Games", };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, androidBooks);

        // get the spinner id what we decleared in xml layout file
        // (activity_second.xml)
        spinner = (Spinner) findViewById(R.id.formulae);

        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);

           //.... same way you can get id of button etc. and work on them

    }

    // implement the item selected listener for spinner
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {
        int item = spinner.getSelectedItemPosition();
        Toast.makeText(getBaseContext(),
                "You have selected the book: " + androidBooks[item],
                Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }

}

和PL以这种方式为清单文件的应用程序标记中的两个活动创建条目

<强>的AndroidManifest.xml

<application
        android:icon="@drawable/icon"
        android:label="@string/app_name">
        <activity
            android:name=".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=".Selection"
            android:label="@string/app_name">
            <intent-filter>             
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

如果您有任何问题，请告诉我！很乐意提供帮助

Answer 4

发生此错误是因为您忘记在清单文件中注册Selection类。将它注册在那里，我确信你的应用程序可以正常工作。

当我在mainactivity中单击一个按钮时，我想显示一个xml文件

4 个答案: