在我的最小值中,我有以下内容:
<activity
android:name="dk.anapp.notebox.CreateCategory"
android:label="@string/title_activity_create_category" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
我使用以下代码调用它:
new AsyncTask<Void, Void, Boolean>() {
@Override
/* Runs on a separate thread */
protected Boolean doInBackground(Void... params) {
String name = txt_name.getText().toString();
String username = txt_username.getText().toString();
String password = txt_password.getText().toString();
return mediator.signUp(name, username, password);
}
@Override
/* Runs on the UI/Main thread when doInBackground()
* has finished */
protected void onPostExecute(Boolean success) {
if(success){
Intent i = new Intent("dk.anapp.notebox.CreateCategory");
startActivity(i);
}else{
Toast.makeText(getApplicationContext(), "Error! Please try again", Toast.LENGTH_LONG).show();
}
}
但是我收到以下错误:
02-12 20:25:43.209 1983-1983/dk.anapp.notebox E/AndroidRuntime﹕ FATAL EXCEPTION: main
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=dk.anapp.notebox.CreateCategory }
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1512)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)
at android.app.Activity.startActivityForResult(Activity.java:3190)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:839)
at android.app.Activity.startActivity(Activity.java:3297)
at dk.anapp.notebox.CreateUser$1.onPostExecute(CreateUser.java:55)
at dk.anapp.notebox.CreateUser$1.onPostExecute(CreateUser.java:40)
at android.os.AsyncTask.finish(AsyncTask.java:602)
at android.os.AsyncTask.access$600(AsyncTask.java:156)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
谁能告诉我为什么会这样?
看起来你在 Intent 构造函数中输入了错误的参数:
Intent i = new Intent("dk.anapp.notebox.CreateCategory");
此构造函数的参数需要 Intent 操作,例如 ACTION_VIEW 等,但您将活动的名称放在此处。这就是为什么logcat抱怨没有找到任何处理你的行为:
No Activity found to handle Intent { act=dk.anapp.notebox.CreateCategory }
也许使用另一个构造函数。 你已经试过了吗?
new Intent(this, CreateCategory.class);
试着这样称呼它:
Intent i = new Intent(youractualactivity.this, CreateCategory.class);
随着您的实际活动在您尝试启动其他活动的活动上。