我見過很多類似的問題,但我想不出什麼我做錯了。我做了一個非常簡單的應用程序來複制錯誤。安卓:IllegalStateException異常:活動遭到破壞的計算器
該應用程序執行以下操作:
它在MainActivty的onCreate中添加一個片段。
用戶可以從對話框添加另一個片段。
當對話框要求在MainActivity的addFragment方法拋出一個異常的事務執行。
這裏是在MainActivity
package com.example.testapp;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.Button;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button button = (Button) findViewById(R.id.add_button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AddButtonDialog addButtonDialog = new AddButtonDialog();
addButtonDialog.show(getSupportFragmentManager(), "ADD");
}
});
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
CustomFragment fragment = new CustomFragment();
transaction.add(R.id.fragment_container, fragment);
transaction.commit();
}
public void addButton() {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
CustomFragment fragment = new CustomFragment();
transaction.add(R.id.fragment_container, fragment);
transaction.commit(); // <-- Exception
}
}
這裏是調用在MainActivity
public class AddButtonDialog extends DialogFragment {
public Dialog onCreateDialog(Bundle savedInstanceState) {
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
final LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.new_button_dialog, null);
builder.setView(view)
.setPositiveButton("Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
MainActivity main = new MainActivity();
main.addButton();
}
});
return builder.create();
}
}
的AddButtonDialog這裏是堆棧跟蹤
02-14 10:09:27.781: E/AndroidRuntime(26291): FATAL EXCEPTION: main
02-14 10:09:27.781: E/AndroidRuntime(26291): java.lang.IllegalStateException: Activity has been destroyed
02-14 10:09:27.781: E/AndroidRuntime(26291): at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1365)
02-14 10:09:27.781: E/AndroidRuntime(26291): at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
02-14 10:09:27.781: E/AndroidRuntime(26291): at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
02-14 10:09:27.781: E/AndroidRuntime(26291): at com.example.testapp.MainActivity.addButton(MainActivity.java:35)
02-14 10:09:27.781: E/AndroidRuntime(26291): at com.example.testapp.AddButtonDialog$1.onClick(AddButtonDialog.java:22)
02-14 10:09:27.781: E/AndroidRuntime(26291): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:185)
02-14 10:09:27.781: E/AndroidRuntime(26291): at android.os.Handler.dispatchMessage(Handler.java:99)
02-14 10:09:27.781: E/AndroidRuntime(26291): at android.os.Looper.loop(Looper.java:137)
02-14 10:09:27.781: E/AndroidRuntime(26291): at android.app.ActivityThread.main(ActivityThread.java:5328)
02-14 10:09:27.781: E/AndroidRuntime(26291): at java.lang.reflect.Method.invokeNative(Native Method)
02-14 10:09:27.781: E/AndroidRuntime(26291): at java.lang.reflect.Method.invoke(Method.java:511)
02-14 10:09:27.781: E/AndroidRuntime(26291): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
02-14 10:09:27.781: E/AndroidRuntime(26291): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
02-14 10:09:27.781: E/AndroidRuntime(26291): at dalvik.system.NativeStart.main(Native Method)
我相當肯定我不是掌握片段生命週期的概念。請有人這麼好解釋我做錯了什麼。
'MainActivity main = new MainActivity();'不這樣做。你不應該嘗試實例化活動 –
謝謝。在我的主要活動中調用方法的正確方法是什麼? – Fuzz
嘗試'MainActivity.this.add()' –