我正在开发我的第一个Android应用程序，特别是在这种情况下，它可以帮助我做得更好。我目前正在努力进行2个活动，即MainActivity.java和whatCanIMake.java。当我使用startActivity(intent)从MainActivity启动whatCanIMake时，我可以使用可拆分对象传递对象，并且通常可以使用whatCanIMake。我的问题是我希望能够传递回在whatCanIMake活动中更改的所有内容的列表。例如：我输入当前所有食材的清单，然后whatCanIMake删除食谱使用的食材。我想回传剩余成分的更新列表。
我遇到的问题是startActivityForResult()。以前，我曾经能够成功使用startActivity()，并将其意图与多余的包裹一起传递给Bob，而Bob是您的叔叔。当我切换到startActivityForResult()时，新活动无法启动，因为应用程序在按下onCreate()之前崩溃了。显然，这指向我的startActivityForResult()实现，因此我基本上已经阅读了与startActivityForResult()相关的每个堆栈溢出问题，现在我在这里！
下面是启动whatCanIMake的代码，以及whatCanIMake中的onActivityResult()和相应代码。
对我来说真是太奇怪了，我可以简单地将startActivityForResult()换成startActivity()，然后该应用程序又可以正常工作了！感谢您的任何帮助。
MainActivity.java：
public void searchRecipe(View view) {
crossViewVariables.setMakeSort('a');
Intent recipe = new Intent(this, whatCanIMake.class);
recipe.putExtra("Pantry",stock);
recipe.putExtra("Cookbook",activeCookbook);
recipe.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivityForResult(recipe,R.integer.search_by_recipe);
//startActivity(recipe);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode) {
case (R.integer.search_by_recipe)://comes from Recipe Search?
if (resultCode == Activity.RESULT_OK) {
Bundle b = data.getExtras();
stock = b.getParcelable("Pantry");
}
if (resultCode == Activity.RESULT_CANCELED) {
}
case (R.integer.search_by_ingredient)://comes from Recipe Search?
if (resultCode == Activity.RESULT_OK) {
Bundle b = data.getExtras();
stock = b.getParcelable("Pantry");
}
if (resultCode == Activity.RESULT_CANCELED) {
}
case (R.integer.make_recipe)://comes from seeRecipe?
if (resultCode == Activity.RESULT_OK) {
Bundle b = data.getExtras();
stock = b.getParcelable("Pantry");
}
if (resultCode == Activity.RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Cancelled", Toast.LENGTH_LONG).show();
}
case (R.integer.edit_pantry):
if (resultCode == Activity.RESULT_OK) {
Bundle b = data.getExtras();
stock = b.getParcelable("Pantry");
}
}
}
whatCanIMake.java：
Intent result = new Intent();
result.putExtra("Pantry", stock);
setResult(Activity.RESULT_OK,result);
finish();
LogCat：
FATAL EXCEPTION: main
Process: com.example.schre.mememachine, PID: 26721
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5697)
at android.widget.TextView.performClick(TextView.java:10826)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5697)
at android.widget.TextView.performClick(TextView.java:10826)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.util.AndroidRuntimeException: FORWARD_RESULT_FLAG used while also requesting a result
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1884)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1545)
at android.app.Activity.startActivityForResult(Activity.java:4283)
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:4230)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
at com.example.schre.mememachine.MainActivity.searchRecipe(MainActivity.java:91)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5697)
at android.widget.TextView.performClick(TextView.java:10826)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
最佳答案
删除此行：
recipe.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivityForResult()不需要它，这就是导致崩溃的原因。