重定向到新活动时，Android应用崩溃(android app crashes when redirecting to new activity)

我是Android的新手，我创建了一个基本活动的应用程序，然后添加了一个按钮来指向另一个活动，它工作，但每当我点击按钮转到新的活动页面应用程序崩溃

我收到以下错误：

10/02 15:22:04: Launching app $ adb push C:\Users\Ahmed\AndroidStudioProjects\Shiftind\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.shiftind.www.shiftind $ adb shell pm install -r "/data/local/tmp/com.shiftind.www.shiftind" Success $ adb shell am start -n "com.shiftind.www.shiftind/com.shiftind.www.shiftind.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Client not ready yet..Waiting for process to come online Connected to process 2284 on device emulator-5554 W/System: ClassLoader referenced unknown path: /data/app/com.shiftind.www.shiftind-2/lib/x86 I/InstantRun: Instant Run Runtime started. Android package is com.shiftind.www.shiftind, real application class is null. W/System: ClassLoader referenced unknown path: /data/app/com.shiftind.www.shiftind-2/lib/x86 W/art: Verification of android.support.v4.media.session.MediaControllerCompat android.support.v4.app.FragmentActivity.getSupportMediaController() took 420.734ms W/art: Verification of void android.support.v4.app.FragmentActivity.requestPermissionsFromFragment(android.support.v4.app.Fragment, java.lang.String[], int) took 107.527ms W/art: Verification of void android.support.v4.app.FragmentActivity.setEnterSharedElementCallback(android.support.v4.app.SharedElementCallback) took 102.953ms W/art: Verification of void android.support.v7.app.AppCompatActivity.onSupportActionModeFinished(android.support.v7.view.ActionMode) took 192.620ms W/art: Verification of void android.support.v4.app.FragmentManagerImpl.setHWLayerAnimListenerIfAlpha(android.view.View, android.view.animation.Animation) took 130.794ms W/art: Verification of android.support.v7.app.AppCompatDelegate android.support.v7.app.AppCompatDelegate.create(android.content.Context, android.view.Window, android.support.v7.app.AppCompatCallback) took 147.296ms W/art: Verification of void android.support.v7.app.AppCompatDelegateImplBase.<init>(android.content.Context, android.view.Window, android.support.v7.app.AppCompatCallback) took 138.730ms W/art: Verification of void android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor() took 166.867ms W/art: Verification of void android.support.v7.app.AppCompatDelegateImplV9.onConfigurationChanged(android.content.res.Configuration) took 215.247ms W/art: Verification of android.support.v7.view.ActionMode android.support.v7.app.AppCompatDelegateImplV9.startSupportActionModeFromWindow(android.support.v7.view.ActionMode$Callback) took 113.775ms W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable W/gralloc_ranchu: Gralloc pipe failed [ 10-02 15:22:33.523 2284: 2284 D/ ] HostConnection::get() New Host Connection established 0xa72c2540, tid 2284 I/OpenGLRenderer: Initialized EGL, version 1.4 D/OpenGLRenderer: Swap behavior 1 I/Choreographer: Skipped 40 frames! The application may be doing too much work on its main thread. D/AndroidRuntime: Shutting down VM --------- beginning of crash E/AndroidRuntime: FATAL EXCEPTION: main Process: com.shiftind.www.shiftind, PID: 2284 java.lang.IllegalStateException: Could not execute method for android:onClick at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) 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:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.shiftind.www.shiftind/com.shiftind.www.shiftind.registration}; 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:4224) at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:75) at android.app.Activity.startActivityForResult(Activity.java:4183) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:856) at android.app.Activity.startActivity(Activity.java:4507) at android.app.Activity.startActivity(Activity.java:4475) at com.shiftind.www.shiftind.MainActivity.onButtonClick(MainActivity.java:19) at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) 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:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Application terminated.

我的mainActivity.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.shiftind.www.shiftind.MainActivity"> <Button android:text="Let's Get Started" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/startbutton" style="@style/Widget.AppCompat.Button.Colored" android:onClick="onButtonClick" android:layout_alignParentStart="true" android:layout_marginStart="85dp" /> </RelativeLayout>

我的registartion.xml（第二项活动）

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:text="registration activity" android:layout_width="wrap_content" android:layout_height="111dp" android:id="@+id/textView3" android:layout_weight="1" android:textStyle="normal|bold" /> </LinearLayout>

我的registration.java

package com.shiftind.www.shiftind; import android.app.Activity; import android.os.Bundle; /** * Created by Ahmed on 10/2/2016. */ public class registration extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.registration); } }

我的主要活动.java

package com.shiftind.www.shiftind; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.content.Intent; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void onButtonClick(View view) { if (view.getId() == R.id.startbutton) { Intent i = new Intent(MainActivity.this, registration.class); startActivity(i); } } }

I am totally new with android, i created an app with basic activity and then added a button to direct to another activity, it worked but whenever i click the button to go to the new activity page the app get crashed

am getting the following error:

10/02 15:22:04: Launching app $ adb push C:\Users\Ahmed\AndroidStudioProjects\Shiftind\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.shiftind.www.shiftind $ adb shell pm install -r "/data/local/tmp/com.shiftind.www.shiftind" Success $ adb shell am start -n "com.shiftind.www.shiftind/com.shiftind.www.shiftind.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Client not ready yet..Waiting for process to come online Connected to process 2284 on device emulator-5554 W/System: ClassLoader referenced unknown path: /data/app/com.shiftind.www.shiftind-2/lib/x86 I/InstantRun: Instant Run Runtime started. Android package is com.shiftind.www.shiftind, real application class is null. W/System: ClassLoader referenced unknown path: /data/app/com.shiftind.www.shiftind-2/lib/x86 W/art: Verification of android.support.v4.media.session.MediaControllerCompat android.support.v4.app.FragmentActivity.getSupportMediaController() took 420.734ms W/art: Verification of void android.support.v4.app.FragmentActivity.requestPermissionsFromFragment(android.support.v4.app.Fragment, java.lang.String[], int) took 107.527ms W/art: Verification of void android.support.v4.app.FragmentActivity.setEnterSharedElementCallback(android.support.v4.app.SharedElementCallback) took 102.953ms W/art: Verification of void android.support.v7.app.AppCompatActivity.onSupportActionModeFinished(android.support.v7.view.ActionMode) took 192.620ms W/art: Verification of void android.support.v4.app.FragmentManagerImpl.setHWLayerAnimListenerIfAlpha(android.view.View, android.view.animation.Animation) took 130.794ms W/art: Verification of android.support.v7.app.AppCompatDelegate android.support.v7.app.AppCompatDelegate.create(android.content.Context, android.view.Window, android.support.v7.app.AppCompatCallback) took 147.296ms W/art: Verification of void android.support.v7.app.AppCompatDelegateImplBase.<init>(android.content.Context, android.view.Window, android.support.v7.app.AppCompatCallback) took 138.730ms W/art: Verification of void android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor() took 166.867ms W/art: Verification of void android.support.v7.app.AppCompatDelegateImplV9.onConfigurationChanged(android.content.res.Configuration) took 215.247ms W/art: Verification of android.support.v7.view.ActionMode android.support.v7.app.AppCompatDelegateImplV9.startSupportActionModeFromWindow(android.support.v7.view.ActionMode$Callback) took 113.775ms W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable W/gralloc_ranchu: Gralloc pipe failed [ 10-02 15:22:33.523 2284: 2284 D/ ] HostConnection::get() New Host Connection established 0xa72c2540, tid 2284 I/OpenGLRenderer: Initialized EGL, version 1.4 D/OpenGLRenderer: Swap behavior 1 I/Choreographer: Skipped 40 frames! The application may be doing too much work on its main thread. D/AndroidRuntime: Shutting down VM --------- beginning of crash E/AndroidRuntime: FATAL EXCEPTION: main Process: com.shiftind.www.shiftind, PID: 2284 java.lang.IllegalStateException: Could not execute method for android:onClick at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) 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:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.shiftind.www.shiftind/com.shiftind.www.shiftind.registration}; 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:4224) at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:75) at android.app.Activity.startActivityForResult(Activity.java:4183) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:856) at android.app.Activity.startActivity(Activity.java:4507) at android.app.Activity.startActivity(Activity.java:4475) at com.shiftind.www.shiftind.MainActivity.onButtonClick(MainActivity.java:19) at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) 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:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Application terminated.

my mainActivity.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.shiftind.www.shiftind.MainActivity"> <Button android:text="Let's Get Started" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/startbutton" style="@style/Widget.AppCompat.Button.Colored" android:onClick="onButtonClick" android:layout_alignParentStart="true" android:layout_marginStart="85dp" /> </RelativeLayout>

my registartion.xml (second activity)

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:text="registration activity" android:layout_width="wrap_content" android:layout_height="111dp" android:id="@+id/textView3" android:layout_weight="1" android:textStyle="normal|bold" /> </LinearLayout>

my registration.java

package com.shiftind.www.shiftind; import android.app.Activity; import android.os.Bundle; /** * Created by Ahmed on 10/2/2016. */ public class registration extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.registration); } }

my main activity.java

package com.shiftind.www.shiftind; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.content.Intent; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void onButtonClick(View view) { if (view.getId() == R.id.startbutton) { Intent i = new Intent(MainActivity.this, registration.class); startActivity(i); } } }