WebView无法显示内容

时间：2014-01-24 02:08:22

标签： android android-activity webview

所有

我在Android上的WebView上显示从EditText字段获取的网址内容时遇到了一些问题。

我只想添加一个插入EditText字段的字符串，在另一个活动上打开一个网址，其中webView打开Goog​​le搜索网址，在EditText中搜索给定文本。

这是我的MainActivity：

package com.hbt.activities;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.webkit.WebView;
import android.widget.EditText;

public class MainActivity extends Activity {

    EditText term;
    String query;
    WebView intview;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    term = (EditText) findViewById(R.id.searchtext);
    query = term.getText().toString();

    intview = (WebView) findViewById(R.id.webView1);
    intview.getSettings().setBuiltInZoomControls(true);
    intview.getSettings().setJavaScriptEnabled(true);
    intview.getSettings().setDomStorageEnabled(true);
}

public void openWikipedia(View intview){

     Intent intent = new Intent(this, Wikipedia.class);
     intent.putExtra("query", query);
     startActivity(intent);
    }

public void openGoogle(View view){

     Intent intent = new Intent(this, Google.class);
     intent.putExtra("query", query);
     startActivity(intent);
    }
}

这是我的Google.java：

package com.hbt.activities;

import android.os.Bundle;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.View; 
import android.webkit.WebView;
import android.widget.Toast;

public class Google extends Activity {
String query;
WebView intview;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_google);
}

public void opengoogle (View webView1){
    intview = (WebView) findViewById(R.id.webView1);
    intview.getSettings().setBuiltInZoomControls(true);
    intview.getSettings().setJavaScriptEnabled(true);
    intview.getSettings().setDomStorageEnabled(true);
    intview.loadUrl("https://www.google.pt");

    String query = "";

    Bundle bundle = getIntent().getExtras();
    if (bundle == null){
        Toast.makeText(getApplicationContext(), "Insert a search item.",Toast.LENGTH_LONG).show();
    }
    if (bundle != null) {
        query = bundle.getString("query");
    }


}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_BACK){
        onBackPressed();
        return true;
    }
    else{
        return super.onKeyDown(keyCode, event);
    }
}
}

最后，Wikipedia.java：

package com.hbt.activities;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebView;
import android.widget.Toast;

public class Wikipedia extends Activity {

    String query;
WebView intview;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_wikipedia);
}

 public void openWikipedia (View view){
     intview = (WebView) findViewById(R.id.webView1);
     intview.getSettings().setBuiltInZoomControls(true);
     intview.getSettings().setJavaScriptEnabled(true);
     intview.getSettings().setDomStorageEnabled(true);

     String query = "";
     Bundle bundle = getIntent().getExtras();
     if (bundle == null){
        Toast.makeText(getApplicationContext(), "Insert a search item.",Toast.LENGTH_LONG).show();
     }
     if (bundle != null) {
         query = bundle.getString("query");
     }

     String url = "en.wikipedia.org/wiki/Special:Search?search="+ query;
     Intent i = new Intent(Intent.ACTION_VIEW);
     i.setData(Uri.parse(url));
     startActivity(i);

}   

    @Override
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_BACK){
         onBackPressed();
         return true;
     }
     else{
        return super.onKeyDown(keyCode, event);
     }
}
}

我真的不明白为什么WebView没有显示内容。任何帮助将非常感激。提前谢谢。

如上所述，这里是布局XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >



<Button
    android:id="@+id/Wikipedia"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/Google"
    android:layout_alignLeft="@+id/Google"
    android:layout_alignRight="@+id/Google"
    android:minEms="6"
    android:onClick="openWikipedia"
    android:text="@string/wikipedia" />

<Button
    android:id="@+id/Google"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:onClick="openGoogle"
    android:text="@string/google" />

<EditText
    android:id="@+id/searchtext"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/Wikipedia"
    android:layout_alignLeft="@+id/Wikipedia"
    android:layout_alignRight="@+id/Google"
    android:layout_marginBottom="18dp"
    android:layout_marginTop="12dp"
    android:hint="@string/text_to_search_" />

<WebView
    android:id="@+id/webView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@+id/searchtext"
    android:layout_alignLeft="@+id/searchtext"
    android:layout_alignParentTop="true" />

</RelativeLayout>

接下来是Wikipedia布局XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<WebView
    android:id="@+id/webView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true" 
    />

</RelativeLayout>

和Google XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<WebView
    android:id="@+id/webView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true" />

</RelativeLayout>

他们是不同的，因为我试图从几个方面处理这个问题。

2 个答案:

答案 0 :(得分：1)

确定。您唯一需要的是 MainActivity 和 main_activity.xml 。

其他的事情，你并不是我真正需要的。

以下是MainActivity的代码清单：

public class MainActivity extends Activity {

    EditText term;
    String query;
    WebView intview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        term = (EditText) findViewById(R.id.searchtext);
        query = term.getText().toString();

        intview = (WebView) findViewById(R.id.webView1);
        intview.getSettings().setBuiltInZoomControls(true);
        intview.getSettings().setJavaScriptEnabled(true);
        intview.getSettings().setDomStorageEnabled(true);
    }

    public void openWikipedia(View intview) {
        String url = "http://en.wikipedia.org/wiki/" + query;
        this.intview.loadUrl(url);
    }

    public void openGoogle(View view) {
        String url = "https://www.google.pt?q="+query;
        this.intview.loadUrl(url);
    }
}

现在，主要活动的布局。与原始版本相比，无需进行任何更改。但是，为了清楚起见，我发布了它。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >



<Button
    android:id="@+id/Wikipedia"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/Google"
    android:layout_alignLeft="@+id/Google"
    android:layout_alignRight="@+id/Google"
    android:minEms="6"
    android:onClick="openWikipedia"
    android:text="Wikipedia" />

<Button
    android:id="@+id/Google"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:onClick="openGoogle"
    android:text="Google" />

<EditText
    android:id="@+id/searchtext"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/Wikipedia"
    android:layout_alignLeft="@+id/Wikipedia"
    android:layout_alignRight="@+id/Google"
    android:layout_marginBottom="18dp"
    android:layout_marginTop="12dp"
    android:hint="Text to search" />

<WebView
    android:id="@+id/webView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@+id/searchtext"
    android:layout_alignLeft="@+id/searchtext"
    android:layout_alignParentTop="true" />

</RelativeLayout>

现在，一旦按下按钮，谷歌或维基百科，您的webview就应该开始加载显示内容。给它一些时间。

对于维基百科：我注意到，它已经重定向，所以最后，它会在默认浏览器中打开新的URL。你需要处理这个问题。

对于Google：可能未正确设置网址，但您可以查看该网址。

但是，现在应该修复 WebView 无法正确加载的主要问题。

--------------------更新-------------------------- -----

现在，改变这些事情：

<强> MainActivity.class 

public class MainActivity extends Activity {

    EditText term;
    String query;
    WebView intview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        term = (EditText) findViewById(R.id.searchtext);
        query = term.getText().toString();

        intview = (WebView) findViewById(R.id.webView1);
        intview.getSettings().setBuiltInZoomControls(true);
        intview.getSettings().setJavaScriptEnabled(true);
        intview.getSettings().setDomStorageEnabled(true);
    }

    public void openWikipedia(View intview) {
        String url = "http://en.wikipedia.org/wiki/" + query;
        this.intview.loadUrl(url);
    }

    public void openGoogle(View view) {
        Intent intent = new Intent(this, Google.class);
        intent.putExtra("query", term.getText().toString());
        startActivity(intent);
    }
}

<强> Google.class 

public class Google extends Activity {
    String query;
    WebView intview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_google);
        opengoogle();
    }

    public void opengoogle() {
        intview = (WebView) findViewById(R.id.webView1);
        intview.getSettings().setBuiltInZoomControls(true);
        intview.getSettings().setJavaScriptEnabled(true);
        intview.getSettings().setDomStorageEnabled(true);
        intview.loadUrl("https://www.google.pt");

        String query = "";

        Bundle bundle = getIntent().getExtras();
        if (bundle == null) {
            Toast.makeText(getApplicationContext(), "Insert a search item.",
                    Toast.LENGTH_LONG).show();
        }
        if (bundle != null) {
            query = bundle.getString("query");
            intview.loadUrl("http://www.google.com?q=" + query);
        }

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            onBackPressed();
            return true;
        } else {
            return super.onKeyDown(keyCode, event);
        }
    }
}

答案 1 :(得分：0)

在发送意图之前，在onclick方法中添加此内容以获取EditText的当前值： query = term.getText（）。toString（）; 

public void openWikipedia(View intview){
     query = term.getText().toString();
     Intent intent = new Intent(this, Wikipedia.class);
     intent.putExtra("query", query);
     startActivity(intent);
    }

public void openGoogle(View view){
     query = term.getText().toString();
     Intent intent = new Intent(this, Google.class);
     intent.putExtra("query", query);
     startActivity(intent);
    }

在onCreate（）中设置网页浏览：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_google);

    intview = (WebView) findViewById(R.id.webView1);
    intview.getSettings().setBuiltInZoomControls(true);
    intview.getSettings().setJavaScriptEnabled(true);
    intview.getSettings().setDomStorageEnabled(true);
    intview.loadUrl("https://www.google.pt");

    String query = "";

    Bundle bundle = getIntent().getExtras();
    if (bundle == null){
        Toast.makeText(getApplicationContext(), "Insert a search item.",Toast.LENGTH_LONG).show();
    }
    if (bundle != null) {
        query = bundle.getString("query");
    }

}

这应该有效。

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