爲什麼我的WebView不起作用？

Question

那麼，我完全是一個初學者，我試圖爲webview做一些練習。但是，我無法找到它是什麼問題。有人可以幫助我嗎？謝謝。

這裏是我的java類：

public class MainActivity extends AppCompatActivity { 
private Button button; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    button = (Button) findViewById(R.id.button1) 
    ; 
    Uri uri = Uri.parse("www.google.com"); 
    final Intent intent = new Intent(Intent.ACTION_VIEW,uri); 

    button.setOnClickListener(
      new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        startActivity(intent); 
       } 
      } 
    ); 
} 
} 

這裏是我的清單文件：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.jinyu.webview"> 
<uses-permission android:name="android.permission.INTERNET"/> 
<application 

    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application> 

</manifest> 

這是我的日誌：

4-16 22:52:03.234 23525-23525/com.example.jinyu.webview E/AndroidRuntime: FATAL EXCEPTION: main 
                     Process: com.example.jinyu.webview, PID: 23525 
                     android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=www.baidu.com } 
                      at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1798) 
                      at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512) 
                      at android.app.Activity.startActivityForResult(Activity.java:3930) 
                      at android.app.Activity.startActivityForResult(Activity.java:3890) 
                      at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:820) 
                      at android.app.Activity.startActivity(Activity.java:4213) 
                      at android.app.Activity.startActivity(Activity.java:4181) 
                      at com.example.jinyu.webview.MainActivity$1.onClick(MainActivity.java:29) 
                      at android.view.View.performClick(View.java:5204) 
                      at android.view.View$PerformClick.run(View.java:21153) 
                      at android.os.Handler.handleCallback(Handler.java:739) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:148) 
                      at android.app.ActivityThread.main(ActivityThread.java:5417) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
04-16 22:52:04.687 23525-23525/com.example.jinyu.webview I/Process: Sending signal. PID: 23525 SIG: 9 

Answer 1

編輯（以備將來遊客）：前實際url添加http://或https://。實現這一

最短的路

public class MainActivity extends AppCompatActivity { 
private Button button; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    button = (Button) findViewById(R.id.button1); 

    button.setOnClickListener(
      new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"))); 
       } 
      } 
    ); 
} 
} 

Answer 2

添加"http://"或"https://"到您的網址。