Android startActivity Error

munai.yi · 发表于 29-4-2015 10:19 AM

package ro.tapi.www.ttouch;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebView;

public class MainActivity extends ActionBarActivity {
private static final String LOGTAG = "MainActivity";
private WebView Wv;
@SuppressLint("JavascriptInterface")

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

      Wv = (WebView)findViewById(R.id.Wv1);
      Wv.getSettings().setJavaScriptEnabled(true);
      Wv.addJavascriptInterface(new JsInteration(), "control");
      Wv.loadUrl("http://www.google.com");
}

public class JsInteration {
      Intent intent = new Intent("ro.tapi.www.ttouch.TreeActivity");

      startActivity(intent);  <<--- 为什么出现错误Invalid method declaration ; Return type requird .
}
}

issac9413 · 发表于 29-4-2015 06:47 PM

本帖最后由 issac9413 于 29-4-2015 06:55 PM 编辑

First thing, this is wrong implementation of the class structure (JsInteration). Second thing, you cannot directly access the startActivity from external class.

public class JsInteration {
Intent intent = new Intent("ro.tapi.www.ttouch.TreeActivity");
startActivity(intent); <<--- 为什么出现错误Invalid method declaration ; Return type requird .
}

复制代码

Below is the correct way of creating the class. And you can call the control.start() from your javascript.

public class MainActivity extends ActionBarActivity {
private static final String LOGTAG = "MainActivity";
private WebView Wv;
@SuppressLint("JavascriptInterface")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Wv = (WebView)findViewById(R.id.Wv1);
Wv.getSettings().setJavaScriptEnabled(true);
Wv.addJavascriptInterface(new JsInteration(MainActivity.this), "control");
Wv.loadUrl("http://www.google.com");
}
public class JsInteration {
private Context _context;
public JsInteration(Context context){
this._context = context;
}
public void start(){
Intent intent = new Intent("ro.tapi.www.ttouch.TreeActivity");
_context.startActivity(intent);
}
}

复制代码

munai.yi · 发表于 29-4-2015 07:58 PM

本帖最后由 munai.yi 于 19-5-2015 01:35 PM 编辑

我想
1 webview 打開 http://abc.com
2 當用戶按下Click 打開新的Activity
3 但總是沒打開新的Activity
JavaScript

<html>
</body>
<a href="#">Click</a>
<script language="javascript">

function g() {
window.control.x()
}
</script>
</html>

Java

package ro.tapi.www.ttouch;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.webkit.JavascriptInterface;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
private static final String LOGTAG = "MainActivity";
private WebView Wv;
@SuppressLint("JavascriptInterface")

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

      Wv = (WebView)findViewById(R.id.Wv1);
      Wv.getSettings().setJavaScriptEnabled(true);
      Wv.addJavascriptInterface(new JsInteration(), "control");

      Wv.loadUrl("http://abc.com");

      Wv.setWebViewClient(new WebViewClient() {
         @Override
         public boolean shouldOverrideUrlLoading(WebView view, String url) {
                  view.loadUrl(url);
                  return true;
            }
         }
      });
}

public class JsInteration {
      public void x(){
         Intent intent = new Intent("ro.tapi.www.touch.Activity");
         startActivity(intent);
      }
}

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