Java 不幸的是，应用程序已停止 android 模拟器 genymotion

Question

提问by Omar Hassan

I am new to android app development( from yesterday only i started to learn android ).

我是 android 应用程序开发的新手（从昨天开始我才开始学习 android ）。

I am getting message in AVD like - unfortunately has stopped ,please help me solve this error, I want learn more in android but sucked by this error.. plz..plz.. help me to sove this.

我在 AVD 中收到消息 - 不幸的是已停止，请帮助我解决此错误，我想在 android 中了解更多信息，但被此错误所吸引..请帮助我解决这个问题。

my main.java is

我的 main.java 是

package com.example.first;

public class MainActivity extends Activity {


int counter = 0 ;
Button add,sub;
TextView total;
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    add = (Button) findViewById(R.id.bt_add);
    sub = (Button) findViewById(R.id.bt_sub);
    total = (TextView) findViewById(R.id.textView1);


    add.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {

            counter++;
            total.setText("ur total is "+ counter);

        }
    });



}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

}

my main.xml is

我的 main.xml 是

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.first.MainActivity$PlaceholderFragment" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="ur total is 0"
    android:textSize="40sp" />

    <Button
        android:id="@+id/bt_add"
        android:layout_width="250dp"
        android:layout_height="40dp"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="add one" />

    <Button
        android:id="@+id/bt_sub"
        android:layout_width="250dp"
        android:layout_height="40dp"
        android:layout_alignLeft="@+id/bt_add"
        android:layout_below="@+id/bt_add"
        android:layout_marginTop="19dp"
        android:text="sub one" />

and the log is

日志是

        03-29 21:33:13.494: D/AndroidRuntime(1256): Shutting down VM
03-29 21:33:13.494: W/dalvikvm(1256): threadid=1: thread exiting with uncaught exception (group=0xa4d6cb20)
03-29 21:33:13.494: E/AndroidRuntime(1256): FATAL EXCEPTION: main
03-29 21:33:13.494: E/AndroidRuntime(1256): Process: com.example.first, PID: 1256
03-29 21:33:13.494: E/AndroidRuntime(1256): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.first/com.example.first.MainActivity}: java.lang.NullPointerException
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.ActivityThread.access0(ActivityThread.java:135)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.os.Looper.loop(Looper.java:136)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.ActivityThread.main(ActivityThread.java:5017)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at java.lang.reflect.Method.invokeNative(Native Method)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at java.lang.reflect.Method.invoke(Method.java:515)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at dalvik.system.NativeStart.main(Native Method)
03-29 21:33:13.494: E/AndroidRuntime(1256): Caused by: java.lang.NullPointerException
03-29 21:33:13.494: E/AndroidRuntime(1256):     at com.example.first.MainActivity.onCreate(MainActivity.java:39)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.Activity.performCreate(Activity.java:5231)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-29 21:33:13.494: E/AndroidRuntime(1256):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-29 21:33:13.494: E/AndroidRuntime(1256):     ... 11 more
03-29 21:34:01.629: D/dalvikvm(1310): Late-enabling CheckJNI
03-29 21:34:01.673: D/AndroidRuntime(1310): Shutting down VM
03-29 21:34:01.673: W/dalvikvm(1310): threadid=1: thread exiting with uncaught exception (group=0xa4d6cb20)
03-29 21:34:01.673: E/AndroidRuntime(1310): FATAL EXCEPTION: main
03-29 21:34:01.673: E/AndroidRuntime(1310): Process: com.example.first, PID: 1310
03-29 21:34:01.673: E/AndroidRuntime(1310): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.first/com.example.first.MainActivity}: java.lang.NullPointerException
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.ActivityThread.access0(ActivityThread.java:135)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.os.Looper.loop(Looper.java:136)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.ActivityThread.main(ActivityThread.java:5017)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at java.lang.reflect.Method.invokeNative(Native Method)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at java.lang.reflect.Method.invoke(Method.java:515)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at dalvik.system.NativeStart.main(Native Method)
03-29 21:34:01.673: E/AndroidRuntime(1310): Caused by: java.lang.NullPointerException
03-29 21:34:01.673: E/AndroidRuntime(1310):     at com.example.first.MainActivity.onCreate(MainActivity.java:38)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.Activity.performCreate(Activity.java:5231)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-29 21:34:01.673: E/AndroidRuntime(1310):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-29 21:34:01.673: E/AndroidRuntime(1310):     ... 11 more
03-29 21:36:56.615: D/AndroidRuntime(1358): Shutting down VM
03-29 21:36:56.615: W/dalvikvm(1358): threadid=1: thread exiting with uncaught exception (group=0xa4d6cb20)
03-29 21:36:56.615: E/AndroidRuntime(1358): FATAL EXCEPTION: main
03-29 21:36:56.615: E/AndroidRuntime(1358): Process: com.example.first, PID: 1358
03-29 21:36:56.615: E/AndroidRuntime(1358): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.first/com.example.first.MainActivity}: java.lang.NullPointerException
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.ActivityThread.access0(ActivityThread.java:135)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.os.Looper.loop(Looper.java:136)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.ActivityThread.main(ActivityThread.java:5017)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at java.lang.reflect.Method.invokeNative(Native Method)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at java.lang.reflect.Method.invoke(Method.java:515)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at dalvik.system.NativeStart.main(Native Method)
03-29 21:36:56.615: E/AndroidRuntime(1358): Caused by: java.lang.NullPointerException
03-29 21:36:56.615: E/AndroidRuntime(1358):     at com.example.first.MainActivity.onCreate(MainActivity.java:38)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.Activity.performCreate(Activity.java:5231)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-29 21:36:56.615: E/AndroidRuntime(1358):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-29 21:36:56.615: E/AndroidRuntime(1358):     ... 11 more
03-29 21:48:16.663: D/AndroidRuntime(1395): Shutting down VM
03-29 21:48:16.663: W/dalvikvm(1395): threadid=1: thread exiting with uncaught exception (group=0xa4d6cb20)
03-29 21:48:16.663: E/AndroidRuntime(1395): FATAL EXCEPTION: main
03-29 21:48:16.663: E/AndroidRuntime(1395): Process: com.example.first, PID: 1395
03-29 21:48:16.663: E/AndroidRuntime(1395): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.first/com.example.first.MainActivity}: java.lang.NullPointerException
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.ActivityThread.access0(ActivityThread.java:135)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.os.Looper.loop(Looper.java:136)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.ActivityThread.main(ActivityThread.java:5017)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at java.lang.reflect.Method.invokeNative(Native Method)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at java.lang.reflect.Method.invoke(Method.java:515)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at dalvik.system.NativeStart.main(Native Method)
03-29 21:48:16.663: E/AndroidRuntime(1395): Caused by: java.lang.NullPointerException
03-29 21:48:16.663: E/AndroidRuntime(1395):     at com.example.first.MainActivity.onCreate(MainActivity.java:38)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.Activity.performCreate(Activity.java:5231)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-29 21:48:16.663: E/AndroidRuntime(1395):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-29 21:48:16.663: E/AndroidRuntime(1395):     ... 11 more
03-29 22:09:36.395: D/AndroidRuntime(1448): Shutting down VM
03-29 22:09:36.395: W/dalvikvm(1448): threadid=1: thread exiting with uncaught exception (group=0xa4d6cb20)
03-29 22:09:36.395: E/AndroidRuntime(1448): FATAL EXCEPTION: main
03-29 22:09:36.395: E/AndroidRuntime(1448): Process: com.example.first, PID: 1448
03-29 22:09:36.395: E/AndroidRuntime(1448): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.first/com.example.first.MainActivity}: java.lang.NullPointerException
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.ActivityThread.access0(ActivityThread.java:135)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.os.Looper.loop(Looper.java:136)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.ActivityThread.main(ActivityThread.java:5017)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at java.lang.reflect.Method.invokeNative(Native Method)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at java.lang.reflect.Method.invoke(Method.java:515)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at dalvik.system.NativeStart.main(Native Method)
03-29 22:09:36.395: E/AndroidRuntime(1448): Caused by: java.lang.NullPointerException
03-29 22:09:36.395: E/AndroidRuntime(1448):     at com.example.first.MainActivity.onCreate(MainActivity.java:38)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.Activity.performCreate(Activity.java:5231)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-29 22:09:36.395: E/AndroidRuntime(1448):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-29 22:09:36.395: E/AndroidRuntime(1448):     ... 11 more

plz.. explain why am getting like this.. tell me the solution

请..解释为什么会这样..告诉我解决方案

Answer 1

采纳答案by Shayan Pourvatan

you got NPE on line 38 that is:

您在第 38 行获得了 NPE，即：

add.setOnClickListener(new View.OnClickListener()

so addis null, and because you declare your button as:

soadd为空，并且因为您将按钮声明为：

add = (Button) findViewById(R.id.bt_add);

so bt_addid is not exists on activity_main, and i think this xml that you post is fragment_main.xmlor anything else.

所以bt_addid 不存在activity_main，我认为你发布的这个 xml 是fragment_main.xml或其他任何东西。

as you define your main layout to activity_mainin

当你定义你的主要布局activity_main在

setContentView(R.layout.activity_main);

so you must have following id in activity_main

所以你必须有以下ID activity_main

1- bt_add

2- bt_sub

3- textView1

so you must have activity_mainlike following code:

所以你必须有activity_main如下代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="ur total is 0"
    android:textSize="40sp" />

    <Button
        android:id="@+id/bt_add"
        android:layout_width="250dp"
        android:layout_height="40dp"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="add one" />

    <Button
        android:id="@+id/bt_sub"
        android:layout_width="250dp"
        android:layout_height="40dp"
        android:layout_alignLeft="@+id/bt_add"
        android:layout_below="@+id/bt_add"
        android:layout_marginTop="19dp"
        android:text="sub one" />

Answer 2

回答by Noob

Looks like you forgot to declare an activity in the manifest. Add this to your AndroidManifest.xml:

看起来您忘记在清单中声明活动。将此添加到您的 AndroidManifest.xml：

<activity android:label="AnotherActivity" android:name="com.somayaji.abhi.Second" />

Answer 3

回答by Subtain Ishfaq

That log shows that you haven't registered your activity in android manefist.xml file. Each activity must be registered in android manifest file in order to work. (Quoting from developers.android.com)

该日志显示您尚未在 android manefist.xml 文件中注册您的活动。每个 Activity 都必须在 android manifest 文件中注册才能工作。（引自developers.android.com）

<activity
android:name="com.example.facebook.MainActivity"
    android:label="@string/app_name" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Answer 4

回答by Bluel3ull

There seems to be a lot easier method to solve this issue as of 8/26/14 (correct me if im wrong) but all you have to do is in main.java change setContentView(R.layout.activity_main); to setContentView(R.layout.fragment_main); only updated cause i had the same issue ty.

截至 2014 年 8 月 26 日，似乎有更简单的方法可以解决此问题（如果我错了，请纠正我），但您要做的就是在 main.java 中更改 setContentView(R.layout.activity_main); 设置内容视图（R.layout.fragment_main）；只更新了因为我有同样的问题ty。

Java 不幸的是，应用程序已停止 android 模拟器 genymotion

提问by Omar Hassan

采纳答案by Shayan Pourvatan

回答by Noob

回答by Subtain Ishfaq

回答by Bluel3ull

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标签

Java 不幸的是，应用程序已停止 android 模拟器 genymotion

提问by Omar Hassan

采纳答案by Shayan Pourvatan

回答by Noob

回答by Subtain Ishfaq

回答by Bluel3ull

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