我正在尝试从主活动中为活动编号当我运行时,应用程序停止工作

2g32fytz  于 2021-06-29  发布在  Java
关注(0)|答案(0)|浏览(224)

在activity_main.xml中,我创建了一个textview、edittext和button。
活动\u main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:layout_width="50dp"
        android:layout_height="20dp"
        android:layout_marginTop="250dp"
        android:id="@+id/edit"
        android:inputType="phone"
        android:textColor="@color/white"
        app:layout_constraintBottom_toTopOf="@id/button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enter the number"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="@+id/edit"
        app:layout_constraintEnd_toStartOf="@+id/edit"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:text="click here"
        android:onClick="VehicleNum"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

当我点击按钮时,它将调用“vehiclenum”方法。在这里,我通过intent调用numberracticity。在设备中运行代码后,当我单击按钮时,应用程序停止工作。帮帮我。
主活动.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
    public void VehicleNum(View view){
        Intent intent = new Intent(this, NumberActivity.class);
        startActivity(intent);
    }

}

列表视图.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvAnimals"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

数字.java

public class Number {
    private Integer mNum;

    public Number(Integer nNum){
        mNum = nNum;
    }

    public Integer getmNum(){
       return mNum;
    }
}

numberactivity.java文件

public class NumberActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list_view);

        ArrayList<Number> gokul = new ArrayList<>();
        int low = 0, high = 999;
        int num;
        int res;

        EditText edit = (EditText)findViewById(R.id.edit);
        int val = Integer.parseInt( edit.getText().toString() );
        for (int number = low; number <= high; ++number) {
            num = remind(number);
            if (num > 9) {
                res = remind(num);
                if (res == val) {
                    gokul.add(new Number(number));
                }
            } else {
                if (num == val) {
                    gokul.add(new Number(number));
                }
            }

        }NumberAdapter adapter = new NumberAdapter(this,gokul);
        ListView listView = (ListView) findViewById(R.id.listview_number);
        listView.setAdapter(adapter);
    }
    public int remind(int num){
        int result = 0;
        while (num != 0) {
            int remainder = num % 10;
            result += remainder;
            num /= 10;
        }
        return result;
    }

}

列表项.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:minHeight="?attr/listPreferredItemHeight"
    android:padding="16dp">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:text=" "/>
</LinearLayout>

numberadapter.java文件

public class NumberAdapter extends ArrayAdapter<Number> {
    private static final String LOG_TAG = NumberAdapter.class.getSimpleName();

    public NumberAdapter(Activity context, ArrayList<Number> gokul) {
        super(context,0,gokul );
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View listItemView = convertView;
        if(listItemView==null){
            listItemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item,parent,false);
        }
        Number currentNumberActivty = getItem(position);
        TextView miwokTextView = (TextView) listItemView.findViewById(R.id.textView);
        miwokTextView.setText(currentNumberActivty.getmNum());
        return listItemView;
    }

}

logcat公司
2021-01-02 16:15:55.971 9161-9161/com.example.recyclerview e/androidruntime:fatal exception:main进程:com.example.recyclerview,pid:9161 java.lang.illegalstateexception:无法执行的方法android:onclick at androidx.appcompat.app.appcompatviewinflater$declaredonclicklistener.onclick(appcompatviewinflater。java:414)在android.view.view.performclick(view。java:6608)在com.google.android.material.button.materialbutton.performclick(materialbutton。java:992)在android.view.view.performclickinternal(视图。java:6585)在android.view.view.access$3100(查看。java:785)在android.view.view$performclick.run(view。java:25921)在android.os.handler.handlecallback(handler。java:873)在android.os.handler.dispatchmessage(handler。java:99)在android.os.looper.loop(looper。java:201)在android.app.activitythread.main(活动线程。java:6810)位于com.android.internal.os.runtimeinit$methodAndArgscaler.run(runtimeinit)的java.lang.reflect.method.invoke(本机方法)。java:547)在com.android.internal.os.zygoteinit.main(zygoteinit。java:873)原因:java.lang.reflect.invocationtargetexception atjava.lang.reflect.method.invoke(本机方法)位于androidx.appcompat.app.appcompatviewinflater$declaredonclicklistener.onclick(appcompatviewinflater)。java:409)在android.view.view.performclick(view。java:6608)  在com.google.android.material.button.materialbutton.performclick(materialbutton。java:992)  在android.view.view.performclickinternal(视图。java:6585)  在android.view.view.access$3100(查看。java:785)  在android.view.view$performclick.run(view。java:25921)  在android.os.handler.handlecallback(handler。java:873)  在android.os.handler.dispatchmessage(handler。java:99)  在android.os.looper.loop(looper。java:201)  在android.app.activitythread.main(activitythread。java:6810)  位于java.lang.reflect.method.invoke(本机方法)  在com.android.internal.os.runtimeinit$methodandargscaller.run(runtimeinit。java:547)  在com.android.internal.os.zygoteinit.main(zygoteinit。java:873)  原因:android.content.activitynotfoundexception:找不到显式活动类{com.example.recyclerview/com.example.recyclerview.number};您是否在androidmanifest.xml中声明了此活动?在android.app.instrumentation.checkstartactivityresult(instrumentation。java:2020)在android.app.instrumentation.execstartactivity(instrumentation。java:1679)在android.app.activity.startactivityforresult(activity。java:4651)在androidx.fragment.app.fragmentactivity.startactivityforresult(fragmentactivity。java:676)在android.app.activity.startactivityforresult(活动。java:4609)在androidx.fragment.app.fragmentactivity.startactivityforresult(fragmentactivity。java:663)在android.app.activity.startactivity(activity。java:4970)在android.app.activity.startactivity(activity。java:4938)在com.example.recyclerview.mainactivity.vehiclenum(mainactivity。java:27)在java.lang.reflect.method.invoke(本机方法)  在androidx.appcompat.app.appcompatviewinflater$declaredonclicklistener.onclick(appcompatviewinflater。java:409)  在android.view.view.performclick(view。java:6608)  在com.google.android.material.button.materialbutton.performclick(materialbutton。java:992)  在android.view.view.performclickinternal(视图。java:6585)  在android.view.view.access$3100(查看。java:785)  在android.view.view$performclick.run(view。java:25921)  在android.os.handler.handlecallback(handler。java:873)  在android.os.handler.dispatchmessage(handler。java:99)  在android.os.looper.loop(looper。java:201)  在android.app.activitythread.main(activitythread。java:6810)  位于java.lang.reflect.method.invoke(本机方法)  在com.android.internal.os.runtimeinit$methodandargscaller.run(runtimeinit。java:547)  在com.android.internal.os.zygoteinit.main(zygoteinit。java:873)  2021-01-02 16:15:56.018 9161-9161/com.example.recyclerview i/process:发送信号。pid:9161信号:9

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