我正在尝试创建一个简单的自定义浏览器,以通过ACTION_VIEW打开一个页面(目前),当我看到日志时,没有错误或警告,但是我无法打开任何页面。
这是我的课程:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String url = "";
if (Objects.requireNonNull(getIntent().getData()).getHost() != null) {
url = getIntent().getData().getHost();
WebView wv = (WebView) findViewById(R.id.webView);
WebSettings settings = wv.getSettings();
settings.setDomStorageEnabled(true);
wv.clearCache(true);
wv.clearHistory();
settings.setJavaScriptEnabled(true);
settings.setLoadsImagesAutomatically(true);
settings.setJavaScriptCanOpenWindowsAutomatically(true);
wv.setWebChromeClient(new WebChromeClient());
wv.loadUrl(url);
}
}
}
...我知道,一开始就有NullPointerException,但这不是问题。
现在我的AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.kangel.webviewsample">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<data android:scheme="http" />
<data android:scheme="https" />
<data android:host="*" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
</intent-filter>
</activity>
</application>
</manifest>
这是我的简单布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
怎么了?我的应用显示空白页!