嗨,我已经尝试了stackoverflow中所有可用的解决方案,但是什么也没用,单击该按钮时,应用程序停止了。请帮帮我。
每当我单击按钮时,应用程序就会崩溃。我希望应用程序在单击按钮时在Web视图中打开URL。请帮助我,任何帮助将不胜感激。
任何人都可以发布修改后的代码。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignParentTop="true"
android:text="@string/button01"
android:onClick="onClick"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignParentTop="true"
android:text="@string/button02"
android:onClick="onClick"/>
</LinearLayout>
------------------------------
screen3.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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" >
<WebView
android:id="@+id/webview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
-----------------------------------------------------
mainactivity.java
package com.example.webview;
import android.support.v7.app.ActionBarActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void onClick(View v)
{
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient());
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
final Context context = this;
Intent intent = new Intent(context, SecondActivity.class);
startActivity(intent);
switch(v.getId())
{
case R.id.button1:
myWebView.loadUrl("http://techcrunch.com/tag/rss/");
break;
case R.id.button2:
myWebView.loadUrl("http://www.bestchance.org.au/");
break;
default:
break;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
--------------------
secondactivity.java
package com.example.webview;
import android.webkit.WebView;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class SecondActivity extends ActionBarActivity {
private WebView webView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screen3);
}
}
-------------------------------
之所以崩溃,是因为您正在调用webview
属于另一个活动的。因此,只需将一个字符串从您的活动传递到第二个活动,然后获取该字符串并将其加载到您的中即可webview
。以下是您如何实现的:
在第一个活动中,将您的onClick
方法编辑为:
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
switch(v.getId())
{
case R.id.action_bar:
intent.putExtra("url", "http://techcrunch.com/tag/rss/");
startActivity(intent);
break;
case R.id.action_bar_spinner:
intent.putExtra("url", "http://www.bestchance.org.au/");
startActivity(intent);
break;
default:
break;
}
}
然后在您的SecondActivity中:
public class SecondActivity extends ActionBarActivity {
private WebView myWebView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screen3);
String url = getIntent().getStringExtra("url");
myWebView = (WebView) findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient());
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl(url);
}
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句