Could not find a method onClick(View) in the activ

2019-02-05 19:37发布

站内文章 / Android
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问题:

The button click in inflate layout fails at runtime because the method cannot be found. E/AndroidRuntime(921): java.lang.IllegalStateException: Could not find a method onClick(View) in the activity but, if click on button from main layout, work good. What have I done wrong?

UPDATE: change code... stil fail ... add error log I want to have all of my buttons were processed in ome method.

main activity class

package com.android.insertview;


import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Toast;

public class InsertViewActivity extends Activity {
    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        /*LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ViewGroup parent = (ViewGroup)findViewById(R.id.main_view);
        inflater.inflate(R.layout.volume_control, parent);*/

        LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);        
        View v = vi.inflate(R.layout.volume_control, null);    
        View insertPoint = findViewById(R.id.main_view);
        ((ViewGroup) insertPoint).addView(v, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT
                                                                            , ViewGroup.LayoutParams.WRAP_CONTENT));
    }


    public void btnclick(View v) {
        // TODO Auto-generated method stub
        Context context = getApplicationContext();
        Toast toast = Toast.makeText(context, 
            "This is Toast Notification", Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.show();       
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" android:id="@+id/main_view">
</LinearLayout>

inflating layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" android:background="@drawable/service_button_container_background" 
    android:id="@+id/volume_view"> 

    <Button
        android:id="@+id/volume_up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/button_volume_up" 
        android:onClick="btnclick" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/button_volume_mute_off" 
        android:onClick="btnclick"/>

    <Button
        android:id="@+id/volume_down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/button_volume_down" 
        android:onClick="btnclick"/>

</LinearLayout>

error log

03-19 15:31:45.184: W/dalvikvm(1071): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
03-19 15:31:45.184: E/AndroidRuntime(1071): Uncaught handler: thread main exiting due to uncaught exception
03-19 15:31:45.194: E/AndroidRuntime(1071): java.lang.IllegalStateException: Could not find a method genclick(View) in the activity
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.View$1.onClick(View.java:2020)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.View.performClick(View.java:2364)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.View.onTouchEvent(View.java:4179)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.widget.TextView.onTouchEvent(TextView.java:6541)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.View.dispatchTouchEvent(View.java:3709)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.os.Looper.loop(Looper.java:123)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.app.ActivityThread.main(ActivityThread.java:4363)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at java.lang.reflect.Method.invokeNative(Native Method)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at java.lang.reflect.Method.invoke(Method.java:521)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at dalvik.system.NativeStart.main(Native Method)
03-19 15:31:45.194: E/AndroidRuntime(1071): Caused by: java.lang.NoSuchMethodException: genclick
03-19 15:31:45.194: E/AndroidRuntime(1071):     at java.lang.ClassCache.findMethodByName(ClassCache.java:308)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at java.lang.Class.getMethod(Class.java:1014)
03-19 15:31:45.194: E/AndroidRuntime(1071):     at android.view.View$1.onClick(View.java:2017)
03-19 15:31:45.194: E/AndroidRuntime(1071):     ... 22 more

UPDATE 2:

ok, if i do so, i can handled all buttons click in one method genericClick()

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/front_end"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <!-- Main -->
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/main_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:background="@drawable/service_button_container_background" >

        <ImageButton
            android:id="@+id/radio"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_radio"
            android:clickable="true"
            android:onClick="genericClick" />

        <ImageButton
            android:id="@+id/player"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_player"
            android:onClick="genericClick" />

        <ImageButton
            android:id="@+id/navi"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_navigation"
            android:onClick="genericClick" />
    </LinearLayout>

    <!-- Volume controls -->
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/volume_controls"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:background="@drawable/service_button_container_background"
        android:orientation="vertical" >

        <ImageButton
            android:id="@+id/volume_up"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_volume_up"
            android:onClick="genericClick" />

        <ImageButton
            android:id="@+id/volume_mute"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_volume_mute_off"
            android:onClick="genericClick" />

        <ImageButton
            android:id="@+id/volume_down"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_volume_down"
            android:onClick="genericClick" />
    </LinearLayout>

    <!-- Radio controls -->
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/radio_controls"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/main_view"
        android:layout_marginRight="100dp"
        android:background="@drawable/service_button_container_background"
        android:visibility="invisible" >

        <ImageButton
            android:id="@+id/radio_preset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="genericClick" android:background="@drawable/button_menu"/>

        <ImageButton
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_rewind"
            android:onClick="genericClick" />

        <ImageButton
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_play"
            android:onClick="genericClick" />

        <ImageButton
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/button_forward"
            android:onClick="genericClick" />
    </LinearLayout>

    <!-- Radio Info -->
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/radio_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/radio_controls"
        android:layout_alignLeft="@+id/main_view"
        android:layout_marginLeft="100dp"
        android:background="@drawable/service_button_container_background"
        android:orientation="vertical" 
        android:visibility="invisible">

        <LinearLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="FM"
                android:textSize="18.0px" />

            <TextView
                android:id="@+id/preset"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="1"
                android:textColor="#ffd6d6d6"
                android:textSize="18.0px" />

            <TextView
                android:layout_width="10.0dip"
                android:layout_height="wrap_content"
                android:text=" "
                android:textSize="18.0px" />

            <TextView
                android:id="@+id/frequency"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="108.0"
                android:textColor="#ffd6d6d6"
                android:textSize="18.0px" />
        </LinearLayout>

        <LinearLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/title"
                android:layout_width="195.0dip"
                android:layout_height="24.0dip"
                android:text="Русское радио"
                android:textColor="#ffd6d6d6"
                android:textSize="18.0px" />
        </LinearLayout>
    </LinearLayout>
</RelativeLayout>

回答1:

Remove the @Override annotation. Check out the official documentation for android:onClick - in their case the "selfDestruct(View)" handler method.

Update: as the others suggested, you should not use such a generic naming for your event-handler method - "onClick" is too generic. What if you have 10 buttons? Try something like "onClickLoginButton", "onClickSaveBtn" etc. I think you cannot use "onClick" as name for your even-handler method, because View.OnClickListener has "onClick" method, so you need to change the name anyways.

<Button
    android:id="@+id/volume_up"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/button_volume_up" 
    android:onClick="handleVolumeUp" />

And in your Activity class

public void handleVolumeUp(View view) {
    // TODO Auto-generated method stub    
}

Remove the implementation of OnClickListener so that the definition of your class becomes:

public class InsertViewActivity extends Activity

UPDATE2: If you want all buttons to be handled by 1 click listener do something like that:

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button btn1 = (Button)findViewById(R.id.btn1);
    btn1.setOnClickListener(btnListener);
    Button btn2 = (Button)findViewById(R.id.btn2);
    btn2.setOnClickListener(btnListener);
    Button btn3 = (Button)findViewById(R.id.btn3);
    btn3.setOnClickListener(btnListener);
}

private OnClickListener btnListener = new OnClickListener()
{

    public void onClick(View v)
    {   
      //do the same stuff or use switch/case and get each button ID and do different   

      //stuff depending on the ID
    } 

};


回答2:

Your not overriding a method so remove @Override

To avoid this in the future you can create your own annotation to declare your methods that are added in the Android XML layout.

Here is a blog post tutorial:

http://blog.blundell-apps.com/using-annotations-for-android-xml-onclick-visibility/



回答3:

The problem in themes of layouts for Android 5.X The main activity do not have tag theme in layout.xml other has and it's a mistake for Android OS.

Solution is here: android 5 and onClick in xml layout

In short: 1) remove tag sheme from all layouts; 2) add tag with correct sheme in manifest

I have tryed for android 5.X phones - it works.



回答4:

A common problem I've seen is that beginners will declare the onClick method as protected or private. When you do this the XML engine cannot access the method which creates this problem.



回答5:

Is your second activity in the manifest.xml?

You need to add al your activity's in there. See code below Change SecondActivity in your activity. And set the package name to were your activity is located

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="PackageName.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>

    <activity 
        android:name="PackageName.SecondActivityName" >     
    </activity>

</application>



回答6:

and you should be note another : public void onclick_method(){your logic;}.the studio do not give you a hint. I just write like this and waste much time to find the answer, finally i found that the right method is like this : public void onclick_method(View view){your logic;} so, donot be forget the parameter in the bracket!

Blockquote



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