所有应用程序都有“意外停止”错误

Question

所有我在模拟器中运行的应用程序，包括从 Google 应用程序页面下载的应用程序都会收到 thisApp 已意外停止错误。

http://developer.android.com/samples/BasicAccessibility/index.html

有什么想法吗？我应该重新安装 Eclipse 吗？我应该在手机上而不是模拟器上运行吗？

Logcat：

03-13 10:44:34.158: D/AndroidRuntime(372): Shutting down VM
03-13 10:44:34.158: W/dalvikvm(372): threadid=1: thread exiting with uncaught exception (group=0x40014760)
03-13 10:44:34.198: E/AndroidRuntime(372): FATAL EXCEPTION: main
03-13 10:44:34.198: E/AndroidRuntime(372): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.android.basicaccessibility/com.example.android.basicaccessibility.MainActivity}: java.lang.ClassNotFoundException: com.example.android.basicaccessibility.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.android.basicaccessibility-2.apk]
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1660)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.os.Handler.dispatchMessage(Handler.java:99)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.os.Looper.loop(Looper.java:126)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.ActivityThread.main(ActivityThread.java:3997)
03-13 10:44:34.198: E/AndroidRuntime(372): at java.lang.reflect.Method.invokeNative(Native Method)
03-13 10:44:34.198: E/AndroidRuntime(372): at java.lang.reflect.Method.invoke(Method.java:491)
03-13 10:44:34.198: E/AndroidRuntime(372): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
03-13 10:44:34.198: E/AndroidRuntime(372): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
03-13 10:44:34.198: E/AndroidRuntime(372): at dalvik.system.NativeStart.main(Native Method)
03-13 10:44:34.198: E/AndroidRuntime(372): Caused by: java.lang.ClassNotFoundException: com.example.android.basicaccessibility.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.android.basicaccessibility-2.apk]
03-13 10:44:34.198: E/AndroidRuntime(372): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251)
03-13 10:44:34.198: E/AndroidRuntime(372): at java.lang.ClassLoader.loadClass(ClassLoader.java:548)
03-13 10:44:34.198: E/AndroidRuntime(372): at java.lang.ClassLoader.loadClass(ClassLoader.java:508)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.Instrumentation.newActivity(Instrumentation.java:1022)
03-13 10:44:34.198: E/AndroidRuntime(372): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
03-13 10:44:34.198: E/AndroidRuntime(372): ... 11 more*

sample_main.xml：

http://www.apache.org/licenses/LICENSE-2.0 除非适用法律要求或书面同意，否则软件 根据许可分发是在“原样”基础上分发的， 没有任何形式的保证或条件，无论是明示或 默示。请参阅许可证以了解具体的管理语言 许可下的权限和限制。 -->

        <!-- Notice the presence of nextFocusDown/nextFocusUp on the elements below. You can
        also use nextFocusLeft/nextFocusRight. This tells the system in what order elements
        should be navigated through. If not present, the system will make a guess based on
        element location in the layout. -->
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Buttons"
                android:id="@+id/buttonsLabel"
                android:layout_alignParentTop="true"
                android:layout_alignParentLeft="true"
                android:nextFocusDown="@+id/composeButton"/>

        <!-- This is a regular, text-based button. No contentDescription is needed, since the
             text field sufficiently describes the action performed. -->
        <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/composeButtonLabel"
                android:id="@+id/composeButton"
                android:layout_below="@+id/buttonsLabel"
                android:layout_alignLeft="@+id/buttonsLabel"
                android:nextFocusUp="@+id/buttonsLabel"
                android:nextFocusDown="@+id/checkboxesLabel"
                />

        <!-- The next two buttons are different types of image-based buttons. -->

        <!-- BEGIN_INCLUDE (image_content_description) -->
        <!-- Adding a contentDescription is needed for accessibility, since no text is present.
        Since the contentDescription is read verbatim, you may want to be a bit more
        descriptive than usual, such as adding "button" to the end of your description, if
        appropriate. -->
        <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/discardButton"
                android:layout_alignTop="@+id/composeButton"
                android:layout_toRightOf="@+id/composeButton"
                android:src="@drawable/ic_action_discard"
                android:layout_alignBottom="@+id/composeButton"
                android:contentDescription="@string/discardButtonDescription"
                android:scaleType="fitCenter"
                android:nextFocusUp="@+id/buttonsLabel"
                android:nextFocusDown="@+id/checkboxesLabel"
                />
        <!-- END_INCLUDE (image_content_description) -->

        <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/infoButton"
                android:layout_alignTop="@+id/discardButton"
                android:layout_toRightOf="@+id/discardButton"
                android:src="@drawable/ic_action_info"
                android:layout_alignBottom="@+id/discardButton"
                android:layout_alignRight="@+id/hyperspaceCheckbox"
                android:scaleType="fitCenter"
                android:background="?android:selectableItemBackground"
                android:padding="5dp"
                android:contentDescription="@string/infoButtonDescription"
                android:nextFocusUp="@+id/buttonsLabel"
                android:nextFocusDown="@+id/checkboxesLabel"
        />

        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/checkboxesLabel"
                android:id="@+id/checkboxesLabel"
                android:layout_below="@+id/composeButton"
                android:layout_alignLeft="@+id/composeButton"
                android:nextFocusUp="@+id/composeButton"
                android:nextFocusDown="@+id/jetpackCheckbox"
                />

        <!-- Like a text-based button, checkboxes with text will often work correctly as-is.
             If your checkboxes do not have a text attribute, you will need to add a
             contentDescriptoin. -->
        <CheckBox
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/jetpackCheckboxLabel"
                android:id="@+id/jetpackCheckbox"
                android:layout_below="@+id/checkboxesLabel"
                android:layout_alignLeft="@+id/checkboxesLabel"
                android:checked="false"
                android:nextFocusUp="@+id/checkboxesLabel"
                android:nextFocusDown="@+id/hyperspaceCheckbox"
                />

        <CheckBox
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/hyperspaceCheckboxLabel"
                android:id="@+id/hyperspaceCheckbox"
                android:layout_below="@+id/jetpackCheckbox"
                android:layout_alignLeft="@+id/jetpackCheckbox"
                android:checked="false"
                android:nextFocusUp="@+id/jetpackCheckbox"
                android:nextFocusDown="@+id/imagesAndTextLabel"
                />

        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/imagesAndTextLabel"
                android:id="@+id/imagesAndTextLabel"
                android:layout_below="@+id/hyperspaceCheckbox"
                android:layout_alignLeft="@+id/hyperspaceCheckbox"
                android:nextFocusUp="@+id/hyperspaceCheckbox"
                android:nextFocusDown="@+id/partlyCloudImage"
                />

        <!-- Images should have a contentDescription if they convey any meaningful
             information. Images that are purely decorative may not need a contentDescription,
             however. -->
        <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/partlyCloudyImage"
                android:layout_below="@+id/imagesAndTextLabel"
                android:layout_alignLeft="@+id/imagesAndTextLabel"
                android:src="@drawable/partly_cloudy"
                android:contentDescription="@string/partlyCloudyDescription"
                android:layout_alignRight="@+id/discardButton"
                android:nextFocusUp="@+id/imagesAndTextLabel"
                android:nextFocusDown="@+id/customViewLabel"
                />

        <!-- TextViews are typically self describing, so do not need extra modifications. -->
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:text="@string/temperature"
                android:textSize="60sp"
                android:id="@+id/temperatureText"
                android:layout_alignTop="@+id/partlyCloudyImage"
                android:layout_toRightOf="@+id/partlyCloudyImage"
                android:layout_alignBottom="@+id/partlyCloudyImage"
                android:gravity="center_vertical"
                android:nextFocusUp="@+id/imagesAndTextLabel"
                android:nextFocusDown="@+id/customViewLabel"
                />

        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/customViewLabel"
                android:id="@+id/customViewLabel"
                android:layout_below="@+id/partlyCloudyImage"
                android:layout_alignLeft="@+id/partlyCloudyImage"
                android:nextFocusUp="@+id/partlyCloudImage"
                android:nextFocusDown="@+id/dialView"
                />

        <!-- Custom views require additonal code changes. See DialView.java for more
             details. -->
        <com.example.android.basicaccessibility.DialView
                android:layout_width="200dp"
                android:layout_height="200dp"
                android:id="@+id/dialView"
                android:layout_below="@+id/customViewLabel"
                android:layout_alignLeft="@+id/partlyCloudyImage"
                android:nextFocusUp="@+id/customViewLabel"
                />

    </RelativeLayout>
</ScrollView> </LinearLayout>

activity_main.xml：

http://www.apache.org/licenses/LICENSE-2.0 除非适用法律要求或书面同意，否则软件 根据许可分发是在“原样”基础上分发的， 没有任何形式的保证或条件，无论是明示或 默示。请参阅许可证以了解具体的管理语言 许可下的权限和限制。 -->

<LinearLayout style="@style/Widget.SampleMessageTile"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:orientation="vertical">

    <TextView style="@style/Widget.SampleMessage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/horizontal_page_margin"
        android:layout_marginRight="@dimen/horizontal_page_margin"
        android:layout_marginTop="@dimen/vertical_page_margin"
        android:layout_marginBottom="@dimen/vertical_page_margin"
        android:text="@string/intro_message" />
</LinearLayout> </LinearLayout>

MainActivity.java：

/* * 版权所有 (C) 2013 Android 开源项目 * * 根据 Apache 许可证 2.0 版（“许可证”）获得许可； * 你 除非遵守许可，否则不得使用此文件。 * 你 可以在 * *
http://www.apache.org/licenses/LICENSE-2.0 * * 除非要求 适用法律或书面同意，软件 * 分发下 许可证按“原样”分发，* 不提供任何保证 或任何明示或暗示的条件。 * 见 特定语言管理权限的许可和 * 许可证下的限制。 */

包 com.example.android.basicaccessibility;

导入android.app.Activity；导入android.os.Bundle；

/** * 基本活动类。 * *

负责渲染 布局，并显示一些祝酒词以提供按钮反馈。 * 这门课没有什么特别有趣的。所有的 有趣的东西在 * res/layout/activity_main.xml 和 {@link 拨号视图}。 */ 公共类 MainActivity 扩展 Activity {

/**
 * Standard onCreate() implementation. Sets R.layout.activity_main as the layout.
 */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sample_main);
} }

DialView.java：

包 com.example.android.basicaccessibility;

导入 android.annotation.TargetApi;导入android.content.Context； 导入android.graphics.Canvas；导入android.graphics.Color；进口 android.graphics.Paint；导入android.os.Build；进口 android.util.AttributeSet；导入android.view.View；进口 android.view.accessibility.AccessibilityEvent;

/** * 自定义视图来展示可访问性。 * *

这个视图 不使用任何框架小部件，因此没有任何可访问性 功能 * 自动。相反，我们使用 {@link android.view.accessibility.AccessibilityEvent} 提供 * 操作系统的可访问性提示。 * *

例如，如果 TalkBack 是 启用后，用户将能够收到语音反馈，因为他们 * 与此视图交互。 * *

更一般地说，这个视图呈现一个 多位置“拨号”，可用于选择一个值 * 1 之间 4. 每按一次转盘，下一个位置将是 选定（模 * 最大位置数）。 */ 公开课 拨号视图扩展视图 { 私有静态 int SELECTION_COUNT = 4;

private static float FONT_SIZE = 40f;
private float mWidth;
private float mHeight;
private float mWidthPadded;
private float mHeightPadded;
private Paint mTextPaint;
private Paint mDialPaint;
private float mRadius;
private int mActiveSelection;

/**
 * Constructor that is called when inflating a view from XML. This is called
 * when a view is being constructed from an XML file, supplying attributes
 * that were specified in the XML file.
 *
 * <p>In our case, this constructor just calls init().
 *
 * @param context The Context the view is running in, through which it can
 *                access the current theme, resources, etc.
 * @param attrs   The attributes of the XML tag that is inflating the view.
 * @see #View(android.content.Context, android.util.AttributeSet, int)
 */
public DialView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

/**
 * Helper method to initialize instance variables. Called by constructor.
 */
private void init() {
    // Paint styles used for rendering are created here, rather than at render-time. This
    // is a performance optimization, since onDraw() will get called frequently.
    mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mTextPaint.setColor(Color.BLACK);
    mTextPaint.setStyle(Paint.Style.FILL_AND_STROKE);
    mTextPaint.setTextAlign(Paint.Align.CENTER);
    mTextPaint.setTextSize(FONT_SIZE);

    mDialPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mDialPaint.setColor(Color.GRAY);

    // Initialize current selection. This will store where the dial's "indicator" is pointing.
    mActiveSelection = 0;

    // Setup onClick listener for this view. Rotates between each of the different selection
    // states on each click.
    //
    // Notice that we call sendAccessibilityEvent here. Some AccessibilityEvents are generated
    // by the system. However, custom views will typically need to send events manually as the
    // user interacts with the view. The type of event sent will vary, depending on the nature
    // of the view and how the user interacts with it.
    //
    // In this case, we are sending TYPE_VIEW_SELECTED rather than TYPE_VIEW_CLICKED, because
    // clicking on this view selects a new value.
    //
    // We will give our AccessibilityEvent further information about the state of the view in
    // onPopulateAccessibilityEvent(), which will be called automatically by the system
    // for each AccessibilityEvent.
    setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // Rotate selection to the next valid choice.
            mActiveSelection = (mActiveSelection + 1) % SELECTION_COUNT;
            // Send an AccessibilityEvent, since the user has interacted with the view.
            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
            // Redraw the entire view. (Inefficient, but this is sufficient for demonstration
            // purposes.)
            invalidate();
        }
    });
}

/**
 * This is where a View should populate outgoing accessibility events with its text content.
 * While this method is free to modify event attributes other than text content, doing so
 * should normally be performed in
 * {@link #onInitializeAccessibilityEvent(android.view.accessibility.AccessibilityEvent)}.
 * <p/>
 * <p>Note that the behavior of this method will typically vary, depending on the type of
 * accessibility event is passed into it. The allowed values also very, and are documented
 * in {@link android.view.accessibility.AccessibilityEvent}.
 * <p/>
 * <p>Typically, this is where you'll describe the state of your custom view. You may also
 * want to provide custom directions when the user has focused your view.
 *
 * @param event The accessibility event which to populate.
 */
// BEGIN_INCLUDE (on_populate_accessibility_event)
@Override
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
    super.onPopulateAccessibilityEvent(event);

    // Detect what type of accessibility event is being passed in.
    int eventType = event.getEventType();

    // Common case: The user has interacted with our view in some way. State may or may not
    // have been changed. Read out the current status of the view.
    //
    // We also set some other metadata which is not used by TalkBack, but could be used by
    // other TTS engines.
    if (eventType == AccessibilityEvent.TYPE_VIEW_SELECTED ||
            eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
        event.getText().add("Mode selected: " + Integer.toString(mActiveSelection + 1) + ".");
        event.setItemCount(SELECTION_COUNT);
        event.setCurrentItemIndex(mActiveSelection);
    }

    // When a user first focuses on our view, we'll also read out some simple instructions to
    // make it clear that this is an interactive element.
    if (eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
        event.getText().add("Tap to change.");
    }
}
// END_INCLUDE (on_populate_accessibility_event)

/**
 * This is called during layout when the size of this view has changed. If
 * you were just added to the view hierarchy, you're called with the old
 * values of 0.
 *
 * <p>This is where we determine the drawing bounds for our custom view.
 *
 * @param w    Current width of this view.
 * @param h    Current height of this view.
 * @param oldw Old width of this view.
 * @param oldh Old height of this view.
 */
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    // Account for padding
    float xPadding = (float) (getPaddingLeft() + getPaddingRight());
    float yPadding = (float) (getPaddingTop() + getPaddingBottom());

    // Compute available width/height
    mWidth = w;
    mHeight = h;
    mWidthPadded = w - xPadding;
    mHeightPadded = h - yPadding;
    mRadius = (float) (Math.min(mWidth, mHeight) / 2 * 0.8);
}

/**
 * Render view content.
 *
 * <p>We render an outer grey circle to serve as our "dial", and then render a smaller black
 * circle to server as our indicator. The position for the indicator is determined based
 * on mActiveSelection.
 *
 * @param canvas the canvas on which the background will be drawn
 */
@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    // Draw dial
    canvas.drawCircle(mWidth / 2, mHeight / 2, (float) mRadius, mDialPaint);

    // Draw text labels
    final float labelRadius = mRadius + 10;
    for (int i = 0; i < SELECTION_COUNT; i++) {
        float[] xyData = computeXYForPosition(i, labelRadius);
        float x = xyData[0];
        float y = xyData[1];
        canvas.drawText(Integer.toString(i + 1), x, y, mTextPaint);
    }

    // Draw indicator mark
    final float markerRadius = mRadius - 35;
    float[] xyData = computeXYForPosition(mActiveSelection, markerRadius);
    float x = xyData[0];
    float y = xyData[1];
    canvas.drawCircle(x, y, 20, mTextPaint);
}

/**
 * Compute the X/Y-coordinates for a label or indicator, given the position number and radius
 * where the label should be drawn.
 *
 * @param pos    Zero based position index
 * @param radius Radius where label/indicator is to be drawn.
 * @return 2-element array. Element 0 is X-coordinate, element 1 is Y-coordinate.
 */
private float[] computeXYForPosition(final int pos, final float radius) {
    float[] result = new float[2];
    Double startAngle = Math.PI * (9 / 8d);   // Angles are in radiansq
    Double angle = startAngle + (pos * (Math.PI / 4));
    result[0] = (float) (radius * Math.cos(angle)) + (mWidth / 2);
    result[1] = (float) (radius * Math.sin(angle)) + (mHeight / 2);
    return result;
} }

MainActivity 清单

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="16" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <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>
</application>

Answer 1

整整一周后，我解决了它。解决方法是注释掉eclipse放入的fragments模板。我很生气。

    public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_first_screen, container, false);
        return rootView;
    }
}

还有这个

        /**       
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment())
                .commit();
    }
    **/

以及更改 XML 文件的工具：指向 Fragment 的上下文。

这真的很烦人也很愚蠢。 Eclipse 创建的默认模板会导致所有这些错误。