java - 实现 'com.android.support:appcompat-v7:28.0.0-beta01' 显示错误

Question

请帮助我。我完全创建了一个android项目。但问题是我的应用程序 gradle 文件显示了下面这个错误。

我还有一个问题。我设置了 InterstitialAd，但它没有显示在我的 Activity 中。请告诉我如何解决这个问题？

gradle.build

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0-beta01'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:design:28.0.0-beta01'
    implementation 'com.android.support:cardview-v7:28.0.0-beta01'
    implementation 'com.google.android.gms:play-services-ads:15.0.1'
}

Activity java

AdRequest adRequest = new AdRequest.Builder().build();
        interstitial = new InterstitialAd(Howtogeek.this);
        interstitial.setAdUnitId(getString(R.string.admob_interstitial_id));

        interstitial.loadAd(adRequest);
        interstitial.setAdListener(new AdListener() {
            public void onAdLoaded() {
                displayInterstitial();
            }
        });

        Howtogeek = (WebView)findViewById(R.id.Howtogeek);
        bar = (ProgressBar)findViewById(R.id.bar);
        Howtogeek.setWebViewClient(new Howtogeek.myWebclient());
        bar.setMax(100);
        Howtogeek.loadUrl("https://www.howtogeek.com/");

        WebSettings webSettings = Howtogeek.getSettings();
        webSettings.setJavaScriptEnabled(true);
        Howtogeek.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
        Howtogeek.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        Howtogeek.getSettings().setAppCacheEnabled(true);
        Howtogeek.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        webSettings.setDomStorageEnabled(true);
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
        webSettings.setUseWideViewPort(true);
        webSettings.setSavePassword(true);
        webSettings.setSaveFormData(true);
        webSettings.setEnableSmoothTransition(true);
    }

    public void displayInterstitial() {
        if (interstitial.isLoaded()) {
            interstitial.show();
        }
    }

Answer 1

如果你用过这个

 implementation 'com.android.support:appcompat-v7:28.0.2'

并且还使用另一个依赖项

 implementation 'com.android.support:support-v13:28.0.2'

这对我来说是工作。希望对您有帮助。