質問編集履歴
3
コメントの追記
test
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test
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@@ -281,3 +281,61 @@
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---
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♯コメントに対する追記 何度も申し訳ございません。
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```
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2020-12-14 21:11:28.702 21871-21896/com.example.oto E/eglCodecCommon: GoldfishAddressSpaceHostMemoryAllocator: ioctl_ping failed for device_type=5, ret=-1
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2020-12-14 21:11:28.928 21871-21896/com.example.oto D/EGL_emulation: eglMakeCurrent: 0xe7e90700: ver 2 0 (tinfo 0xefb625c0)
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2020-12-14 21:11:37.371 21871-21871/com.example.oto D/AndroidRuntime: Shutting down VM
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2020-12-14 21:11:37.373 21871-21871/com.example.oto E/AndroidRuntime: FATAL EXCEPTION: main
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300
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Process: com.example.oto, PID: 21871
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kotlin.UninitializedPropertyAccessException: lateinit property mediaPlayer has not been initialized
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304
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305
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at com.example.oto.MainActivity.stopMusic(MainActivity.kt:42)
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at com.example.oto.MainActivity$onCreate$2.onClick(MainActivity.kt:31)
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309
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at android.view.View.performClick(View.java:6597)
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310
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at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:992)
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at android.view.View.performClickInternal(View.java:6574)
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315
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at android.view.View.access$3100(View.java:778)
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at android.view.View$PerformClick.run(View.java:25885)
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at android.os.Handler.handleCallback(Handler.java:873)
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320
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321
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at android.os.Handler.dispatchMessage(Handler.java:99)
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at android.os.Looper.loop(Looper.java:193)
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at android.app.ActivityThread.main(ActivityThread.java:6669)
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at java.lang.reflect.Method.invoke(Native Method)
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at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
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at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
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2020-12-14 21:11:37.395 21871-21871/com.example.oto I/Process: Sending signal. PID: 21871 SIG: 9
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```
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#]
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2
コメントへの追記
test
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test
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@@ -221,3 +221,63 @@
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#写真
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♯コメントに対する追記 activity_main
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```kotlin
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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236
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context=".MainActivity">
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244
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245
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246
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<Button
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android:id="@+id/button"
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250
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251
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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255
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android:text="@string/start"
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256
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257
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tools:layout_editor_absoluteX="143dp"
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tools:layout_editor_absoluteY="119dp" />
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<Button
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android:id="@+id/button2"
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266
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/stop"
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tools:layout_editor_absoluteX="138dp"
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274
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275
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tools:layout_editor_absoluteY="363dp" />
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276
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+
</androidx.constraintlayout.widget.ConstraintLayout>
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+
```
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---
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1
コメントに対する追記
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -143,3 +143,81 @@
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143
143
|
#補足情報
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144
144
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145
145
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androidstudio4.1
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146
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+
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147
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+
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148
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+
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149
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+
#コメントに対する追記となります
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150
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+
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151
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+
```
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152
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+
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153
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+
2020-12-14 19:51:11.901 19828-19828/com.example.oto E/AndroidRuntime: FATAL EXCEPTION: main
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154
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+
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155
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+
Process: com.example.oto, PID: 19828
|
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156
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+
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157
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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.oto/com.example.oto.MainActivity}: java.lang.NullPointerException: findViewById(R.id.start_music) must not be null
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158
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+
|
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159
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+
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
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160
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+
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161
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+
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
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162
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+
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163
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+
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
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164
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+
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165
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+
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
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166
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+
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167
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+
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
|
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168
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+
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169
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+
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
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170
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171
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+
at android.os.Handler.dispatchMessage(Handler.java:106)
|
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172
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+
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173
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+
at android.os.Looper.loop(Looper.java:193)
|
|
174
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+
|
|
175
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+
at android.app.ActivityThread.main(ActivityThread.java:6669)
|
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176
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+
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177
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+
at java.lang.reflect.Method.invoke(Native Method)
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178
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+
|
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179
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+
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
|
|
180
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+
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181
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+
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
|
|
182
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+
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|
183
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+
Caused by: java.lang.NullPointerException: findViewById(R.id.start_music) must not be null
|
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184
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+
|
|
185
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+
at com.example.oto.MainActivity.onCreate(MainActivity.kt:19)
|
|
186
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+
|
|
187
|
+
at android.app.Activity.performCreate(Activity.java:7136)
|
|
188
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+
|
|
189
|
+
at android.app.Activity.performCreate(Activity.java:7127)
|
|
190
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+
|
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191
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+
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
|
|
192
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+
|
|
193
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+
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
|
|
194
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+
|
|
195
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+
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
|
|
196
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+
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|
197
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+
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
|
|
198
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+
|
|
199
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+
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
|
|
200
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+
|
|
201
|
+
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
|
|
202
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+
|
|
203
|
+
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
|
|
204
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+
|
|
205
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+
at android.os.Handler.dispatchMessage(Handler.java:106)
|
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206
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+
|
|
207
|
+
at android.os.Looper.loop(Looper.java:193)
|
|
208
|
+
|
|
209
|
+
at android.app.ActivityThread.main(ActivityThread.java:6669)
|
|
210
|
+
|
|
211
|
+
at java.lang.reflect.Method.invoke(Native Method)
|
|
212
|
+
|
|
213
|
+
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
|
|
214
|
+
|
|
215
|
+
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
|
|
216
|
+
|
|
217
|
+
|
|
218
|
+
|
|
219
|
+
```
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|
220
|
+
|
|
221
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+
#写真
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222
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+
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223
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+
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