Question

有一个奇怪的事件。我有两个手机4.1.2和2.3.6 Android版本，4.1.2工作正常，但较旧的一个抛出此错误。

我的XML：

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

<RelativeLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<ImageButton 

    android:id="@+id/IB_Nearest"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="IB_Nearest"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:src="@drawable/marker"
    android:background="@null"
    android:layout_margin="30dp"
    />     
    <ImageButton 
    android:id="@+id/IB_Category"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="IB_Category"
    android:src="@drawable/book"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:background="@null"
    android:layout_margin="30dp"
    />
<ImageButton 

    android:id="@+id/IB_Map"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="IB_Map"
    android:layout_below="@id/IB_Category"
    android:layout_alignParentRight="true"
    android:src="@drawable/mappp"
    android:background="@null"
    android:layout_margin="30dp"
    />

<ImageButton 
    android:id="@+id/IB_Search"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="IB_Search"
    android:src="@drawable/search"
    android:layout_below="@id/IB_Nearest"
    android:layout_alignParentLeft="true"
    android:background="@null"
    android:layout_margin="30dp"
    />
<ImageButton 

    android:id="@+id/IB_NewPlace"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="IB_NewPlace"
    android:layout_below="@id/IB_Search"
    android:layout_alignParentLeft="true"
    android:src="@drawable/info"
    android:background="@null"

    />

<ImageButton 
    android:id="@+id/IB_Statistics"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="IB_Statistics"
    android:src="@drawable/chart"
    android:layout_below="@id/IB_Map"
    android:layout_alignParentRight="true"
    android:background="@null"

    />
</RelativeLayout>
</ScrollView>

我的主要：

public class MainActivity extends FragmentActivity implements
LoaderManager.LoaderCallbacks<Cursor>{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
         requestWindowFeature(Window.FEATURE_NO_TITLE); 
        super.onCreate(savedInstanceState);
    }

    public void IB_Map (View v){
        Intent intent = new Intent(MainActivity.this, Map.class);
        startActivity(intent);
    }
    public void IB_Category(View v){

        Intent intent = new Intent(MainActivity.this, TreeChoice.class);
        startActivity(intent);
    }
    public void IB_Nearest (View v){
        Intent intent = new Intent(MainActivity.this, NearPlaces.class);
        startActivity(intent);
    }
    public void IB_Search (View v){

        Intent intent = new Intent(MainActivity.this, Search.class);
        startActivity(intent);
    }
    public void IB_NewPlace (View v){
        Intent intent = new Intent(MainActivity.this, NewPlace.class);
        startActivity(intent);
    }
    public void IB_Statistics (View v){

        Intent intent = new Intent(MainActivity.this, Statistics.class);
        startActivity(intent);
    }

    /**
     * Background Async Task to Load all product by making HTTP Request
     * */
    public class LoadAllProducts extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        /**
         * getting All products from url
         * */
        protected String doInBackground(String... args) {

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
        }
    }

    @Override
    public android.support.v4.content.Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
        // TODO Auto-generated method stub
        return null;
    }

    public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
        // TODO Auto-generated method stub
    }

    public void onLoaderReset(Loader<Cursor> arg0) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onLoadFinished(
            android.support.v4.content.Loader<Cursor> arg0, Cursor arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onLoaderReset(android.support.v4.content.Loader<Cursor> arg0) {
        // TODO Auto-generated method stub
    }
}

但是如果我使用这个监听器实现：

final ImageButton rightButton = (ImageButton) findViewById(R.id.IB_Map);
rightButton.setOnClickListener(new ImageButton.OnClickListener() {  
    public void onClick(View v)
    {
        Intent intent = new Intent(MainActivity.this, Map.class);
        startActivity(intent);
    }
});

一切正常，有人可以解释为什么会这样吗？

12-10 00:05:21.875: E/AndroidRuntime(28537): FATAL EXCEPTION: main
12-10 00:05:21.875: E/AndroidRuntime(28537): java.lang.IllegalStateException: Could not find a method IB_Map(View) in the activity class lt.whitegroup.workplaces.ui.MainActivity for onClick handler on view class android.widget.ImageButton with id 'IB_Map'
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.view.View$1.onClick(View.java:2131)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.view.View.performClick(View.java:2485)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.view.View$PerformClick.run(View.java:9080)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.os.Handler.handleCallback(Handler.java:587)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.os.Looper.loop(Looper.java:130)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.app.ActivityThread.main(ActivityThread.java:3687)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.reflect.Method.invokeNative(Native Method)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.reflect.Method.invoke(Method.java:507)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at dalvik.system.NativeStart.main(Native Method)
12-10 00:05:21.875: E/AndroidRuntime(28537): Caused by: java.lang.NoSuchMethodException
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.Class.getDeclaredMethods(Native Method)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.ClassCache.getDeclaredPublicMethods(ClassCache.java:153)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.ClassCache.getMethodsRecursive(ClassCache.java:216)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.ClassCache.findMethods(ClassCache.java:175)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.ClassCache.getMethods(ClassCache.java:167)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at java.lang.Class.getMethod(Class.java:961)
12-10 00:05:21.875: E/AndroidRuntime(28537):    at android.view.View$1.onClick(View.java:2124)
12-10 00:05:21.875: E/AndroidRuntime(28537):    ... 11 more

Answer 1

您应该setContentView(R.layout.<your_layout_id>)方法onCreate()。

找不到方法

1 个答案: