Textview无法转换为小部件

Question

我在我的应用中将holoeverywhere与viewpagerindicator结合使用，但是我收到了这个错误：

12-16 16:08:48.485: E/AndroidRuntime(12366): FATAL EXCEPTION: main
12-16 16:08:48.485: E/AndroidRuntime(12366):
java.lang.ClassCastException: android.widget.TextView cannot be cast
to org.holoeverywhere.widget.TextView 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
com.smart.tangsel.viewpagerindicator.TestFragmentAdapter.instantiateItem(TestFragmentAdapter.java:101)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.support.v4.view.ViewPager.addNewItem(ViewPager.java:832) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.support.v4.view.ViewPager.populate(ViewPager.java:982) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.support.v4.view.ViewPager.populate(ViewPager.java:914) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.View.measure(View.java:15193) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.View.measure(View.java:15193) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.View.measure(View.java:15193) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.View.measure(View.java:15193) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2217)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.view.View.measure(View.java:15193) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4216)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.view.Choreographer.doCallbacks(Choreographer.java:555) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.Choreographer.doFrame(Choreographer.java:525) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
android.os.Handler.handleCallback(Handler.java:615) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.os.Handler.dispatchMessage(Handler.java:92) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
android.os.Looper.loop(Looper.java:137) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
android.app.ActivityThread.main(ActivityThread.java:4794) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
java.lang.reflect.Method.invokeNative(Native Method) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
java.lang.reflect.Method.invoke(Method.java:511) 12-16 16:08:48.485:
E/AndroidRuntime(12366):    at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
12-16 16:08:48.485: E/AndroidRuntime(12366):    at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) 12-16
16:08:48.485: E/AndroidRuntime(12366):  at
dalvik.system.NativeStart.main(Native Method)

这是我的代码：

package com.smart.tangsel.viewpagerindicator;

import com.smart.tangsel.LoginActivity;
import com.smart.tangsel.UserFunctions;
import com.smart.tangsel.app.ContentActivity;
import com.smart.tangsel.app.ContentCommentActivity;
import com.smart.tangsel.app.DetailLaporanActivity;
import com.smart.tangsel.app.SplashTangsel;
import com.smart.tangsel.app.WelcomeActivity;

import com.smart.tangsel.database_content.DatabaseHandler;
import com.smart.tangsel.database_content.Setting_App;
import com.smart.tangsel.R;

import org.holoeverywhere.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import org.holoeverywhere.widget.Button;
import android.widget.ImageView;
import android.widget.TabWidget;
import org.holoeverywhere.widget.TextView;

public class TestFragmentAdapter extends PagerAdapter {

    private static String[] titles = new String[] {
        "Mudah",
        "Capture",
        "Submit",
        "Share",
        "Mari berpartisipasi dalam Pembangunan Kota Tangerang Selatan melalui Smart Tangsel"
    };

    private static String[] desc = new String[] {
        "Hanya dengan 3 langkah mudah",
        "Adukan temuan anda akan Kerusakan Fasilitas, Kemacetan dan Penyakit Masyarakat lainnya di kota Tangerang Selatan dengan sangat mudah.",
        "Ketik langsung keluhan anda untuk Pemerintah Kota Tangerang Selatan.",
        "Bagikan keluhan anda ke Social Media yang anda miliki.",
        ""
    };

    private static int[] images = new int[] {
        R.drawable.startup1,
        R.drawable.startup2,
        R.drawable.startup3,
        R.drawable.startup4,
        R.drawable.smart_tangsel,
    };

    private final Context context;

    public TestFragmentAdapter(Context context) {
        this.context = context;
    }

    UserFunctions userFunctions;

    @Override
    public boolean isViewFromObject(View v, Object o) {
        // TODO Auto-generated method stub
        return v.equals(o);
    }

    @Override
    public String getPageTitle(int position) {
        return titles[position];
    }

    public String versi_app(Context context){
        PackageInfo pInfo = null;
        try {
            pInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
        } catch (NameNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

     String version;
    return version = pInfo.versionName;
    }

    @Override
    public int getCount() {
        return titles.length;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
         View v = ((LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE))
                .inflate(R.layout.info_update, null, false);

         TextView title = (TextView)v.findViewById(R.id.title_update);
         TextView desc_up = (TextView)v.findViewById(R.id.desc_up);
         ImageView description = (ImageView) v.findViewById(R.id.img_update);
         Button btn_start_app = (Button) v.findViewById(R.id.btn_start_app);

         if(position==(getCount()-1)){
             btn_start_app.setVisibility(View.VISIBLE);
             desc_up.setVisibility(View.GONE);
             btn_start_app.setOnClickListener(new android.view.View.OnClickListener() 
             {

                public void onClick(View v) 
                {                   

                    DatabaseHandler settingappDb = new DatabaseHandler(context);                
                    Setting_App setting_app = new Setting_App("infoupdate",versi_app(context));        
                    boolean stat= settingappDb.addsetting_app(setting_app);

                    if(stat){
                         userFunctions = new UserFunctions();
                        if(userFunctions.isUserLoggedIn(context)){ 
                            context.startActivity(new Intent(context,SplashTangsel.class));
                        } 
                        else{
                            context.startActivity(new Intent(context,LoginActivity.class));
                        }
                     //   ((Activity) context).overridePendingTransition (R.anim.push_left_in, R.anim.push_left_out);
                        ((Activity) context).finish();
                    }



                }
            });
         }

         desc_up.setText(desc[position]);

         title.setText(titles[position]);
         title.setShadowLayer(1,1,1, Color.WHITE); 

     //    if(position==0)title.setText(titles[position]+versi_app(context));

         description.setImageResource(images[position]);

         //This is very important
         ( (ViewPager) container ).addView( v, 0 );

         return v;
    }

    @Override
    public void destroyItem(View pager, int position, Object view) {
        ((ViewPager) pager).removeView((View) view);
    }

    @Override
    public void finishUpdate(View view) {
    }

    @Override
    public void restoreState(Parcelable p, ClassLoader c) {
    }

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public void startUpdate(View view) {
    }


}

当我点击错误时，它似乎部分 TextView title =（TextView）v.findViewById（R.id.title_update）;

我该如何解决？

Answer 1

从外观上看，您在布局文件中使用标准Android TextView而不是自定义org.holoeverywhere.widget.TextView

<org.holoeverywhere.widget.TextView
    android:id="@+id/title_update"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

Answer 2

删除导入

import org.holoeverywhere.widget.TextView;

并将其替换为

import android.widget.TextView;

Answer 3

确保您已导入 org.holoeverywhere.widget.TextView 。赞了这个

import android.app.Activity;
import android.os.Bundle;
import org.holoeverywhere.widget.TextView;

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

private TextView mTvShow;

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

    mTvShow = (TextView) this.findViewById(R.layout.main);
    mTvShow.setText("Hello");
  }
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent">
<org.holoeverywhere.widget.TextView
        android:id="@+id/holo_tv_show"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hello World, MyActivity"/>
</LinearLayout>