java - 启动应用程序时 AdMob 崩溃

标签 java android android-studio crash admob

我对 Android Studio 和 Java 完全陌生，但通过许多教程成功制作了自己的应用程序。问题是，每当我在主屏幕中单击我的应用程序(启动/启动)时，它会立即让我离开 apk(崩溃)。我不确定为什么。我相信它已连接到我的 Main_Activity 文件，但我不确定。我也遵循了 Google 的教程“AdMob for Android - Android Studio 入门”。我制作了一个新的空白 Android 应用程序并按照教程进行操作，效果很好。但是，在我当前的应用程序中，它似乎崩溃了。

如果有人知道如何修复它，请告诉我。我已经遇到这个问题两周了，但仍然无法解决。谢谢。这是我当前应用程序的文件:

Main_Activity.java:

package com.xxxxxxx.xxxxxxxxxxx;

import com.xxxxxxx.xxxxxxxx.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 com.astuetz.PagerSlidingTabStrip;
import com.flaviofaria.kenburnsview.KenBurnsView;
import com.nineoldandroids.view.ViewHelper;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;

import java.util.Random;

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;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

   AdView mAdView = (AdView) findViewById(R.id.adView);
   AdRequest adRequest = new AdRequest.Builder().build();
   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..
}

@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);
    }

}

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent" >

<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<FrameLayout
    android:id="@+id/header"
    android:layout_width="match_parent"
    android:layout_height="298dp" >

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/banner_ad_unit_id">
    </com.google.android.gms.ads.AdView>

    <com.flaviofaria.kenburnsview.KenBurnsView
        android:id="@+id/header_picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/photo1"
      />

    <ImageView
        android:id="@+id/header_thumbnail"
        android:layout_width="@dimen/header_logo_size"
        android:layout_height="@dimen/header_logo_size"
        android:layout_gravity="center"
        android:src="@drawable/header_thumbnail" />

    <com.astuetz.PagerSlidingTabStrip
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="48dip"
        android:layout_gravity="bottom"
        android:textColor="#ffffff"
        app:pstsIndicatorColor="#ffffff"
        app:pstsDividerColor="@android:color/transparent"
        android:background="@android:color/transparent" />
</FrameLayout>

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="56dp" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >
        <ImageView
            android:id="@+id/icon"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="6dp"
            android:layout_marginBottom="6dp"
            android:layout_width="44dp"
            android:layout_height="44dp" />
        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title" />
    </LinearLayout>
</android.support.v7.widget.Toolbar>

字符串.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">A Random App</string>
<string name="hello_world">This is a Test.</string>
<string name="action_settings">Settings[BETA]</string>
<string name="actionbar_title">A Random App.</string>
<string name="banner_ad_unit_id">ca-app-pub-xxxxxxxxxxxxxxx/xxxxxxxxxxxxx</string>
<string name="subscribe"><a href="https://www.google.com">Google</a></string>
<string name="apps"><a href="https://www.google.pl/">Google</a></string>
<string name="extra"><a href="https://www.google.pl/">Google</a></string>

构建.gradle

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.1"

defaultConfig {
    applicationId "com.xrevolt.mmxstructures"
    minSdkVersion 14
    targetSdkVersion 23
    versionCode 2
    versionName "1.2.0"
}

buildTypes {
    release {
        apply plugin: 'announce'
        /*
        runProguard false
        */
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:21.0.+'
compile 'com.android.support:cardview-v7:21+'
compile 'com.flaviofaria:kenburnsview:1.0.5'
compile 'com.jpardogo.materialtabstrip:library:1.0.6'
compile 'com.nineoldandroids:library:2.4.0'
compile 'com.google.android.gms:play-services-ads:8.4.0'
}

最佳答案

嗯，我修好了。但现在 AdMob 横幅会在滚动图像后面的顶部弹出。我希望它位于底部并与scrollView 类一起留在那里。

修复:

package com.xxxxxxx.xxxxxxxxxxx;

import com.xxxxxxx.xxxxxxxx.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 com.astuetz.PagerSlidingTabStrip;
import com.flaviofaria.kenburnsview.KenBurnsView;
import com.nineoldandroids.view.ViewHelper;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;

import java.util.Random;

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;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

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..

AdView mAdView = (AdView) findViewById(R.id.adView); AdRequest adRequest = new AdRequest.Builder().build(); mAdView.loadAd(adRequest);

}

@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);
}

}

}

有人有解决这个问题的代码吗？

关于java - 启动应用程序时 AdMob 崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36806579/

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