質問編集履歴
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編集
test
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File without changes
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test
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@@ -2,13 +2,45 @@
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それぞれのnavigationがタップされた時に、処理を書きたいのですが、
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それぞれのnavigationがタップされた時に、処理を書きたいのですが、エラーが出てしまいます。
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MainからMember のintentに移ろうと、
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navigation drawerをタップするとエラーになります。
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**Main-Member-Sub **
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と遷移したいです。
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main(navigation drawerで)
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Member(リストビューをタップ)
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試しに
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MainからSubに移すとエラーなく行けました。
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Main-Memberに設定するとエラーが出ます。
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何が原因でしょうか?
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main
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```ここに言語を入力
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@SuppressWarnings("StatementWithEmptyBody")
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@Override
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@@ -26,19 +58,17 @@
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} else if (id == R.id.nav_member) {
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//こんな感じ????
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Intent member_intent = new Intent();
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member_intent.setClassName("com.example.navigationdrawer", "com.example.navigationdrawer.Member");
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startActivity(member_intent);
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@@ -66,90 +96,200 @@
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}
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```
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Member.java
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```ここに言語を入力
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public class Member extends AppCompatActivity {
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private ListView listView;
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ArrayList<MemberProfile> memberProfilesList;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.content_main);
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listView = (ListView)findViewById(R.id.listView1);
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//アレイリストのインスタンスを作成
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memberProfilesList = new ArrayList<>();
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memberProfilesList.add(new MemberProfile("吉田拓郎","農家",R.drawable.human,"農家の吉田拓郎です。最近の趣味はアイスホッケー。好きな食べ物はドリアとピザです。"));
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memberProfilesList.add(new MemberProfile("静岡じゅん","広報", R.drawable.human1,"広報担当のじゅんです。プリンが大好物!"));
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memberProfilesList.add(new MemberProfile("ケイティ・スチュワート","広報", R.drawable.human2,"Hi I'm Katie. My job is PR and SNS manager."));
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//配列を保持するアダプターのインスタンスと引数を設定
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//ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, profiles);
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CustomAdapter customAdapter = new CustomAdapter(this, memberProfilesList);
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//アダプターをリストビューのインスタンスに設定
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listView.setAdapter(customAdapter);
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listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
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@Override
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public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
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MemberProfile memberProfile = (MemberProfile)listView.getItemAtPosition(position);
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Intent sub = new Intent();
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sub.putExtra("list_names", memberProfile.getName());
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sub.putExtra("list_jobs",memberProfile.getJob());
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sub.putExtra("list_images",memberProfile.getImage());
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sub.putExtra("list_comments",memberProfile.getComment());
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sub.setClassName("com.example.navigationdrawer", "com.example.navigationdrawer.SubActivity");
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startActivity(sub);
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}
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});
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}
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}
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```
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エラー
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```ここに言語を入力
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FATAL EXCEPTION: main
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Process: com.example.navigationdrawer, PID: 19942
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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.navigationdrawer/com.example.navigationdrawer.Member}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
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at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2320)
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at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2380)
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at android.app.ActivityThread.access$800(ActivityThread.java:151)
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at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1285)
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at android.os.Handler.dispatchMessage(Handler.java:102)
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at android.os.Looper.loop(Looper.java:135)
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at android.app.ActivityThread.main(ActivityThread.java:5289)
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at java.lang.reflect.Method.invoke(Native Method)
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at java.lang.reflect.Method.invoke(Method.java:372)
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at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
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at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
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Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
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at com.example.navigationdrawer.Member.onCreate(Member.java:54)
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at android.app.Activity.performCreate(Activity.java:6018)
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at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
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at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2273)
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at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2380)
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at android.app.ActivityThread.access$800(ActivityThread.java:151)
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at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1285)
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at android.os.Handler.dispatchMessage(Handler.java:102)
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at android.os.Looper.loop(Looper.java:135)
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at android.app.ActivityThread.main(ActivityThread.java:5289)
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at java.lang.reflect.Method.invoke(Native Method)
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at java.lang.reflect.Method.invoke(Method.java:372)
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at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
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at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
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```
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ボタンのクリックリスナーと同じようにこんな感じでいいんでしょうか?
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ちなみに、カアスタマイズしたテキストはこんな感じです。
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```ここに言語を入力
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<?xml version="1.0" encoding="utf-8"?>
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<menu xmlns:android="http://schemas.android.com/apk/res/android">
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<group android:checkableBehavior="single">
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<item
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android:id="@+id/nav_corporate"
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android:title="会社概要" />
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<item
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android:id="@+id/nav_member"
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android:title="メンバー" />
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<item
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android:id="@+id/nav_history"
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android:title="沿革" />
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<item
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android:id="@+id/nav_business"
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android:title="事業紹介" />
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</group>
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<item android:title="その他">
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<menu>
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<item
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android:id="@+id/nav_contact"
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android:title="連絡先" />
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</menu>
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</item>
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</menu>
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```
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