Question

我在App-Store中上传了一个Android-App（SDK-Versions 15-25）。 Crashlytics报告了以下例外情况：

Fatal Exception: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 sel=act=android.intent.action.MAIN cat=[android.intent.category.APP_MUSIC]} }
       at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1776)
       at android.app.Instrumentation.execStartActivity(Instrumentation.java:1496)
       at android.app.Activity.startActivityForResult(Activity.java:3798)
       at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50)
       at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79)
       at android.app.Activity.startActivityForResult(Activity.java:3749)
       at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
       at android.app.Activity.startActivity(Activity.java:4079)
       at android.app.Activity.startActivity(Activity.java:4047)
       at com.myapp.myappname.ui.activity.MainActivity.onOptionsItemSelected(MainActivity.java:467)
       at android.app.Activity.onMenuItemSelected(Activity.java:2934)
       at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:408)
       at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195)
       at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:113)
       at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:113)
       at android.support.v7.app.ToolbarActionBar$2.onMenuItemClick(ToolbarActionBar.java:69)
       at android.support.v7.widget.Toolbar$1.onMenuItemClick(Toolbar.java:206)
       at android.support.v7.widget.ActionMenuView$MenuBuilderCallback.onMenuItemSelected(ActionMenuView.java:776)
       at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:822)
       at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:156)
       at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:969)
       at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:959)
       at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:623)
       at android.support.v7.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:154)
       at android.view.View.performClick(View.java:4807)
       at android.view.View$PerformClick.run(View.java:20106)
       at android.os.Handler.handleCallback(Handler.java:815)
       at android.os.Handler.dispatchMessage(Handler.java:104)
       at android.os.Looper.loop(Looper.java:194)
       at android.app.ActivityThread.main(ActivityThread.java:5576)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)

这是 MainActivity ：

中的方法

 @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id == R.id.player) {
            Timber.i( "Added onClick listener to ImageView ivPlayer.");
            Intent intent=Intent.makeMainSelectorActivity(Intent.ACTION_MAIN, Intent.CATEGORY_APP_MUSIC);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
            return true;
           } else if (id == R.id.logout) {
            Toast.makeText(getApplicationContext(), "Logging out...", Toast.LENGTH_LONG).show();
            logout();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

以前我使用以下代码并使用相同的例外：

 Intent intent = new Intent(MediaStore.INTENT_ACTION_MUSIC_PLAYER);
 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 startActivity(intent);

具有此例外的操作系统是4.4.4和5.0.1。

有关此例外的任何想法以及避免它的建议吗？

Answer 1

具有此例外的操作系统是4.4.4和5.0.1

没有。您碰巧收到了这些操作系统版本的崩溃通知。有大约20亿个Android设备，这类问题可能发生在任何一个上。

此异常的任何想法

您假设这些约20亿台Android设备中的每一台都有一个或多个活动匹配Intent.ACTION_MAIN和Intent.CATEGORY_APP_MUSIC的应用。这些设备的任何都不需要进行此类活动。

避免它的建议？

选项＃1：在startActivity() / try数据块中换住catch来电并抓住ActivityNotFoundException，然后告诉用户您找不到合适的应用。

选项＃2：使用PackageManager和queryIntentActivities()查看Intent是否有匹配项。如果没有，请不要拨打startActivity()，然后告诉用户您找不到合适的应用。

Answer 2

到你的代码

Intent intent = new Intent(MediaStore.INTENT_ACTION_MUSIC_PLAYER);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

添加以下内容

try {
    List<ResolveInfo> activities = getPackageManager().queryIntentActivities(intent, PackageManager.GET_ACTIVITIES);
    if (activities.size() > 0)
        startActivity(intent);
    else
        Toast.makeText(MainActivity.this, "A music player is absent on your device!", Toast.LENGTH_SHORT).show();
} catch (ActivityNotFoundException e) {
    e.printStackTrace();
} catch (SecurityException e){
    e.printStackTrace();
}

Answer 3

致命异常可能是您正在传递null对象。

某些Android设备上的ActivityNotFoundException

3 个答案: