E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.a2, PID: 18827 android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.a2/com.example.a2.jisuanqi}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2049) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1709) at android.app.Activity.startActivityForResult(Activity.java:5192) at androidx.activity.ComponentActivity.startActivityForResult(ComponentActivity.java:597) at android.app.Activity.startActivityForResult(Activity.java:5150) at androidx.activity.ComponentActivity.startActivityForResult(ComponentActivity.java:583) at android.app.Activity.startActivity(Activity.java:5521) at android.app.Activity.startActivity(Activity.java:5489) at com.example.a2.MainActivity$1.onClick(MainActivity.java:37) at android.view.View.performClick(View.java:7125) at android.view.View.performClickInternal(View.java:7102) at android.view.View.access$3500(View.java:801) at android.view.View$PerformClick.run(View.java:27336) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
时间: 2024-03-10 22:45:45 浏览: 192
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这段错误日志表示在启动一个Activity时出现了问题,具体来说是因为在AndroidManifest.xml文件中没有声明该Activity。这意味着你要启动的Activity在AndroidManifest.xml文件中没有被注册,导致系统无法找到该Activity。
为了解决这个问题,你需要在AndroidManifest.xml文件中注册该Activity。具体来说,你需要在<application>标签内添加一个<activity>标签,并将该Activity的名称作为其android:name属性的值。例如:
```xml
<application>
<activity android:name=".jisuanqi" />
</application>
```
这样就可以在应用程序中启动名为"jisuanqi"的Activity了。记得将"jisuanqi"替换为你实际使用的Activity的名称。
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