经过多次尝试修复多种错误后，我已经摆脱了许多错误，但更多的错误已经出现。我对AS和Java来说是全新的，所以它可能是一个容易解决的问题。我想我错过了几节课。因此，这是输出：
错误：（79,9）错误：找不到符号变量mAdView
错误：（79,45）错误：找不到符号变量ad_view
错误：（89,9）错误：找不到符号变量mAdView
错误：（140,19）错误：变量adRequest已在方法onCreate（Bundle）中定义
错误：（175,13）错误：找不到符号变量mAdView
错误：（176,13）错误：找不到符号变量mAdView
错误：（185,13）错误：找不到符号变量mAdView
错误：（186,13）错误：找不到符号变量mAdView
MainActivity.java
package com.xxxx.xxxxx;
//import com.xxxx.xxxxx.R;
import android.annotation.TargetApi;
import android.graphics.RectF;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.util.SparseArrayCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.text.Spannable;
import android.text.SpannableString;
import android.util.TypedValue;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.ImageView;
import android.widget.ScrollView;
import android.widget.TextView;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.content.Intent;
import com.astuetz.PagerSlidingTabStrip;
import com.flaviofaria.kenburnsview.KenBurnsView;
import com.nineoldandroids.view.ViewHelper;
import java.util.Random;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity implements ScrollTabHolder, ViewPager.OnPageChangeListener {
private static AccelerateDecelerateInterpolator sSmoothInterpolator = new AccelerateDecelerateInterpolator();
private KenBurnsView mHeaderPicture;
private View mHeader;
private PagerSlidingTabStrip mPagerSlidingTabStrip;
private ViewPager mViewPager;
private PagerAdapter mPagerAdapter;
private Toolbar toolbar;
private TextView title;
private ImageView icon;
private int mActionBarHeight;
private int mMinHeaderHeight;
private int mHeaderHeight;
private int mMinHeaderTranslation;
private ImageView mHeaderLogo;
private RectF mRect1 = new RectF();
private RectF mRect2 = new RectF();
private TypedValue mTypedValue = new TypedValue();
private SpannableString mSpannableString;
private AlphaForegroundColorSpan mAlphaForegroundColorSpan;
int[] photos={R.drawable.photo1, R.drawable.phpto2, R.drawable.photo3, R.drawable.photo4, R.drawable.photo5, R.drawable.photo6, R.drawable.photo7, R.drawable.photo8, R.drawable.photo9};
KenBurnsView imageView;
/* =====================ADS===================== */
AdView adView;
/* =====================ADS===================== */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*setContentView(R.layout.activity_main);*/
//
// Gets the ad view defined in layout/ad_fragment.xml with ad unit ID set in
// values/strings.xml.
mAdView = (AdView) findViewById(R.id.ad_view);
// Create an ad request. Check your logcat output for the hashed device ID to
// get test ads on a physical device. e.g.
// "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.build();
// Start loading the ad in the background.
mAdView.loadAd(adRequest);
//
mMinHeaderHeight = getResources().getDimensionPixelSize(R.dimen.min_header_height);
mHeaderHeight = getResources().getDimensionPixelSize(R.dimen.header_height);
mMinHeaderTranslation = -mMinHeaderHeight + getActionBarHeight();
setContentView(R.layout.activity_main);
imageView =(KenBurnsView) findViewById(R.id.header_picture);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
icon = (ImageView) findViewById(R.id.icon);
title = (TextView) findViewById(R.id.title);
mSpannableString = new SpannableString(getString(R.string.actionbar_title));
mHeaderLogo = (ImageView) findViewById(R.id.header_thumbnail);
mHeader = findViewById(R.id.header);
mPagerSlidingTabStrip = (PagerSlidingTabStrip) findViewById(R.id.tabs);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setOffscreenPageLimit(4);
mPagerAdapter = new PagerAdapter(getSupportFragmentManager());
mPagerAdapter.setTabHolderScrollingContent(this);
mViewPager.setAdapter(mPagerAdapter);
mPagerSlidingTabStrip.setViewPager(mViewPager);
mPagerSlidingTabStrip.setOnPageChangeListener(this);
mAlphaForegroundColorSpan = new AlphaForegroundColorSpan(0xffffffff);
ViewHelper.setAlpha(getActionBarIconView(), 0f);
getSupportActionBar().setBackgroundDrawable(null);
final Handler handler = new Handler();
Runnable runnable = new Runnable() {
int i=0;
public void run() {
// change images randomly
Random ran=new Random();
int i=ran.nextInt(photos.length);
//set image resources
imageView.setImageResource(photos[i]);
i++;
if(i>photos.length-1)
{
i=0;
}
handler.postDelayed(this, 7000); //for interval...
}
};
handler.postDelayed(runnable, 7000); //for initial delay..
/* =====================ADS===================== */
AdView mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
/* =====================ADS===================== */
}
/* =====================ADS===================== */
@Override
public void onDestroy() {
if (adView != null) {
adView.destroy();
}
super.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my, 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);
}
/** Called when leaving the activity */
@Override
public void onPause() {
if (mAdView != null) {
mAdView.pause();
}
super.onPause();
}
/** Called when returning to the activity */
@Override
public void onResume() {
super.onResume();
if (mAdView != null) {
mAdView.resume();
}
}
/* Called before the activity is destroyed
@Override
public void onDestroy() {
if (mAdView != null) {
mAdView.destroy();
}
super.onDestroy();
}
*/
/* =====================ADS===================== */
@Override
public void onPageScrollStateChanged(int arg0) {
// nothing
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
// nothing
}
@Override
public void onPageSelected(int position) {
SparseArrayCompat<ScrollTabHolder> scrollTabHolders = mPagerAdapter.getScrollTabHolders();
ScrollTabHolder currentHolder = scrollTabHolders.valueAt(position);
currentHolder.adjustScroll((int) (mHeader.getHeight() + ViewHelper.getTranslationY(mHeader)), mHeaderHeight);
}
@Override
public void onScroll(ScrollView view, int x, int y, int oldX, int oldY, int pagePosition)
{
if (mViewPager.getCurrentItem() == pagePosition)
{
mHeader.setTranslationY(Math.max(-view.getScrollY(), mMinHeaderTranslation));
float ratio = clamp(mHeader.getTranslationY() / mMinHeaderTranslation, 0.0f, 1.0f);
interpolate(mHeaderLogo, getActionBarIconView(), sSmoothInterpolator.getInterpolation(ratio));
setTitleAlpha(clamp(5.0F * ratio - 4.0F, 0.0F, 1.0F));
}
}
@Override
public void adjustScroll(int scrollHeight,int headerTranslationY) {
// nothing
}
public static float clamp(float value, float max, float min) {
return Math.max(Math.min(value, min), max);
}
private void interpolate(View view1, View view2, float interpolation) {
getOnScreenRect(mRect1, view1);
getOnScreenRect(mRect2, view2);
float scaleX = 1.0F + interpolation * (mRect2.width() / mRect1.width() - 1.0F);
float scaleY = 1.0F + interpolation * (mRect2.height() / mRect1.height() - 1.0F);
float translationX = 0.5F * (interpolation * (mRect2.left + mRect2.right - mRect1.left - mRect1.right));
float translationY = 0.5F * (interpolation * (mRect2.top + mRect2.bottom - mRect1.top - mRect1.bottom));
ViewHelper.setTranslationX(view1, translationX);
ViewHelper.setTranslationY(view1, translationY - ViewHelper.getTranslationY(mHeader));
ViewHelper.setScaleX(view1, scaleX);
ViewHelper.setScaleY(view1, scaleY);
}
private RectF getOnScreenRect(RectF rect, View view) {
rect.set(view.getLeft(), view.getTop(), view.getRight(), view.getBottom());
return rect;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public int getActionBarHeight() {
if (mActionBarHeight != 0) {
return mActionBarHeight;
}
if(Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB){
getTheme().resolveAttribute(android.R.attr.actionBarSize, mTypedValue, true);
}else{
getTheme().resolveAttribute(R.attr.actionBarSize, mTypedValue, true);
}
mActionBarHeight = TypedValue.complexToDimensionPixelSize(mTypedValue.data, getResources().getDisplayMetrics());
return mActionBarHeight;
}
private void setTitleAlpha(float alpha) {
mAlphaForegroundColorSpan.setAlpha(alpha);
mSpannableString.setSpan(mAlphaForegroundColorSpan, 0, mSpannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
title.setText(mSpannableString);
}
private ImageView getActionBarIconView() {
return icon;
}
public class PagerAdapter extends FragmentPagerAdapter {
private SparseArrayCompat<ScrollTabHolder> mScrollTabHolders;
private final String[] TITLES = { "Home", "Install", "About", "Media", "Survey", "Upcoming", "News", "Help", "Credits", "Share", "More"};
private ScrollTabHolder mListener;
public PagerAdapter(FragmentManager fm) {
super(fm);
mScrollTabHolders = new SparseArrayCompat<ScrollTabHolder>();
}
public void setTabHolderScrollingContent(ScrollTabHolder listener) {
mListener = listener;
}
@Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
@Override
public int getCount() {
return TITLES.length;
}
@Override
public Fragment getItem(int position) {
ScrollTabHolderFragment fragment = (ScrollTabHolderFragment) ScrollViewFragment.newInstance(position);
mScrollTabHolders.put(position, fragment);
if (mListener != null) {
fragment.setScrollTabHolder(mListener);
}
return fragment;
}
public SparseArrayCompat<ScrollTabHolder> getScrollTabHolders() {
return mScrollTabHolders;
}
}
public class LinkButtons extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void goToSo (View view) {
goToUrl ( "http://stackoverflow.com/");
}
public void goToSu (View view) {
goToUrl ( "http://superuser.com/");
}
private void goToUrl (String url) {
Uri uriUrl = Uri.parse(url);
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(launchBrowser);
}
}
}
我是否缺课？请描述我的错误以及是否有解决方案。
答案 0 :(得分：0)
您已经两次在onCreate（）上定义了相同的方法。删除onCreate或更改方法名称
@Override
public void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}