質問編集履歴
3
動いた構文を載せました
test
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File without changes
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test
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@@ -126,7 +126,7 @@
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126
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127
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```
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-
MainActivity.java
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129
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MainActivity.java（修正前）
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```Java
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@@ -228,6 +228,112 @@
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```
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MainActivity.java（修正後ーこの構文で動きました）
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```Java
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234
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235
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package sfw.tabtest;
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237
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import android.os.Bundle;
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import android.support.annotation.NonNull;
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import android.support.design.widget.BottomNavigationView;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v4.app.FragmentTransaction;
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import android.support.v7.app.AppCompatActivity;
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import android.view.MenuItem;
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256
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public class MainActivity extends AppCompatActivity {
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private Fragment fragment;
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private FragmentManager fragmentManager;
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264
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265
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private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
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= new BottomNavigationView.OnNavigationItemSelectedListener() {
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@Override
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275
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public boolean onNavigationItemSelected(@NonNull MenuItem item) {
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277
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switch (item.getItemId()) {
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278
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279
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case R.id.navigation_home:
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280
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281
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fragment = new main();
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break;
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284
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285
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case R.id.navigation_upload:
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286
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fragment = new upload();
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288
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break;
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290
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291
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case R.id.navigation_setting:
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292
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fragment = new Setting();
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294
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295
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break;
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296
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297
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}
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298
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final FragmentTransaction transaction = fragmentManager.beginTransaction();
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300
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301
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transaction.replace(R.id.content, fragment).commit();
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302
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return true;
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304
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305
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}
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307
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};
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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314
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315
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super.onCreate(savedInstanceState);
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316
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317
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setContentView(R.layout.activity_main);
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318
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319
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//追記
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320
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+
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321
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fragmentManager = getSupportFragmentManager();
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322
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+
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323
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//追記終わり
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324
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325
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fragment = new main();
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326
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327
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BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
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328
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329
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navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
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330
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331
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+
}
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332
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+
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333
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+
}
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334
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+
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335
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+
```
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336
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+
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231
337
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fragment_main.xml
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232
338
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233
339
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```XML
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|
@@ -336,6 +442,10 @@
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336
442
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337
443
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[stackoverflowーset new theme for app when switch fragment](http://stackoverflow.com/questions/33080373/set-new-theme-for-app-when-switch-fragment)
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338
444
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445
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+
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446
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+
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447
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+
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448
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+
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339
449
|
###バージョン、デバッグ環境
|
|
340
450
|
|
|
341
451
|
PC：Windows10
|
2
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -8,7 +8,7 @@
|
|
|
8
8
|
|
|
9
9
|
|
|
10
10
|
|
|
11
|
-
###追記：Logcat（赤字部）です
|
|
11
|
+
###追記：Logcat（赤字部抜粋）です
|
|
12
12
|
|
|
13
13
|
```logcat
|
|
14
14
|
|
1
Logcatの追記をしました
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -8,6 +8,52 @@
|
|
|
8
8
|
|
|
9
9
|
|
|
10
10
|
|
|
11
|
+
###追記：Logcat（赤字部）です
|
|
12
|
+
|
|
13
|
+
```logcat
|
|
14
|
+
|
|
15
|
+
03-04 00:47:01.287 7080-7080/sfw.tabtest E/AndroidRuntime: FATAL EXCEPTION: main
|
|
16
|
+
|
|
17
|
+
Process: sfw.tabtest, PID: 7080
|
|
18
|
+
|
|
19
|
+
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference
|
|
20
|
+
|
|
21
|
+
at sfw.tabtest.MainActivity$1.onNavigationItemSelected(MainActivity.java:33)
|
|
22
|
+
|
|
23
|
+
at android.support.design.widget.BottomNavigationView$1.onMenuItemSelected(BottomNavigationView.java:141)
|
|
24
|
+
|
|
25
|
+
at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:817)
|
|
26
|
+
|
|
27
|
+
at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:156)
|
|
28
|
+
|
|
29
|
+
at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:964)
|
|
30
|
+
|
|
31
|
+
at android.support.design.internal.BottomNavigationMenuView$1.onClick(BottomNavigationMenuView.java:89)
|
|
32
|
+
|
|
33
|
+
at android.view.View.performClick(View.java:4756)
|
|
34
|
+
|
|
35
|
+
at android.view.View$PerformClick.run(View.java:19749)
|
|
36
|
+
|
|
37
|
+
at android.os.Handler.handleCallback(Handler.java:739)
|
|
38
|
+
|
|
39
|
+
at android.os.Handler.dispatchMessage(Handler.java:95)
|
|
40
|
+
|
|
41
|
+
at android.os.Looper.loop(Looper.java:135)
|
|
42
|
+
|
|
43
|
+
at android.app.ActivityThread.main(ActivityThread.java:5221)
|
|
44
|
+
|
|
45
|
+
at java.lang.reflect.Method.invoke(Native Method)
|
|
46
|
+
|
|
47
|
+
at java.lang.reflect.Method.invoke(Method.java:372)
|
|
48
|
+
|
|
49
|
+
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
|
|
50
|
+
|
|
51
|
+
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
|
|
52
|
+
|
|
53
|
+
```
|
|
54
|
+
|
|
55
|
+
|
|
56
|
+
|
|
11
57
|
###ソースコード
|
|
12
58
|
|
|
13
59
|
activity_main.xml
|