【发布时间】：2017-04-25 23:03:02
【问题描述】：
我是 Android 工作室的新手，所以我确定我只是缺少一些简单的东西。奇怪的是，这个应用程序有 3 个活动，前两个我可以毫无问题地切换，但第三个崩溃了。我已经尽可能地缩小了代码范围，但我什至无法切换到一个完全空白的 xml 页面。
交换按钮代码：
public void goA3(View V) {
Intent intent = new Intent(this, ThirdActivity.class);
startActivity(intent);
}
ThirdActivity.class 的代码：
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class ThirdActivity extends AppCompatActivity {
// static final public String PREF_STRING_3 = "string_3";
AppInfo appInfo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
appInfo = AppInfo.getInstance(this);
}
}
空白页的基本 XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
</LinearLayout>
再次感谢，我确定我缺少一些基本的东西。
Logcat：
FATAL EXCEPTION: main
Process: com.dealfaro.luca.backandforthstudio, PID: 2586
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:275)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.dealfaro.luca.backandforthstudio/com.dealfaro.luca.backandforthstudio.ThirdActivity}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1805)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1523)
at android.app.Activity.startActivityForResult(Activity.java:4225)
at android.app.Activity.startActivityForResult(Activity.java:4183)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:784)
at android.app.Activity.startActivity(Activity.java:4522)
at android.app.Activity.startActivity(Activity.java:4490)
at com.dealfaro.luca.backandforthstudio.MainActivity.goA3(MainActivity.java:67)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
【问题讨论】：
-
检查你的 logcat 是否有来自崩溃的stack trace。
-
已发布，据我所知，它不喜欢按钮点击。但是，当我映射相同的按钮以尝试从主页移动到第二个活动（而不是第三个）时，它起作用了，所以我不确定问题出在按钮上。感谢您的链接。
-
Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {...ThirdActivity}; have you declared this activity in your AndroidManifest.xml?- 你有吗？ -
您应该仔细阅读整个堆栈跟踪。正如 Mike M 在上面发布的那样，它准确地告诉您如何解决问题。如果您不理解这部分信息，请在 Google 上搜索更多提示。