Question

我在android中做了一个简单的自定义浏览器，有非常基本的控件有刷新和返回，以及Url的edittext，我想做的是当用户ener任何url并点击“go”按钮时，它应该打开页面在同一浏览器中（不在默认浏览器中）。我已实现如下：但我的“go”按钮不起作用。它一直显示“找不到网页”。所以请帮助我这个我的代码如下：< / p>

subheader.java

package com.example.browserdemo;

import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class SubHeader extends LinearLayout implements OnClickListener {

    private Context context;

    public ImageView btn_back;
    public TextView txtTitle;
    public ImageView btn_reload;
    public EditText et_url;
    public Button go;

    public SubHeader(Context context) {
        super(context);
        this.context = context;
        init();
    }

    public SubHeader(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        init();
    }

    public void init() {
        View view = LayoutInflater.from(this.context).inflate(
                R.layout.uc_sub_header, this, true);

        this.btn_back = (ImageView) view.findViewById(R.id.btn_back);
        this.btn_reload = (ImageView) view.findViewById(R.id.btn_reload);
        this.go = (Button) view.findViewById(R.id.go);
        this.et_url = (EditText) view.findViewById(R.id.et_url);

        this.btn_back.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btn_back) {
            ((Activity) this.context).finish();
        }

    }
}

main.java

package com.example.browserdemo;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.webkit.WebSettings.LayoutAlgorithm;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

public class MainActivity extends Activity {

    WebView Browser;
    public SubHeader subHeader;
    public EditText et_url;
    public Button go;
    public ImageView btn_back, btn_reload;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        Browser = (WebView) findViewById(R.id.webview);
        this.subHeader = (SubHeader) findViewById(R.id.menu_header);
        this.subHeader.btn_back.setVisibility(View.VISIBLE);
        this.subHeader.btn_reload.setVisibility(View.VISIBLE);

        btn_back = (ImageView) findViewById(R.id.btn_back);
        btn_reload = (ImageView) findViewById(R.id.btn_reload);
        Browser.loadUrl("http://www.google.com/");
        et_url = (EditText) findViewById(R.id.et_url);
        go = (Button) findViewById(R.id.go);

        btn_reload.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Browser.reload();
            }
        });
        go.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String theWebsite = et_url.getText().toString();
                Browser.loadUrl(theWebsite);
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(Browser.getWindowToken(), 0);

            }
        });
        btn_back.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (Browser.canGoBack()) {
                    Browser.goBack();
                }

            }
        });
        generateUI();
    }

    public void generateUI() {

        new GetRealTimeUrl().execute();

    }

    public class GetRealTimeUrl extends AsyncTask<Void, Void, Void> {
        public ProgressDialog mProgress;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            this.mProgress = new ProgressDialog(MainActivity.this);
            this.mProgress.setMessage("Please Wait...");
            this.mProgress.setCancelable(false);
            this.mProgress.setIndeterminate(false);
            this.mProgress.show();
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            Browser.loadUrl("http://www.google.com/");
            Browser.setWebViewClient(new WebViewClient() {
                @Override
                public boolean shouldOverrideUrlLoading(WebView view, String url) {
                    view.loadUrl(url);
                    return false;
                }
            });
            Browser.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL);
            Browser.getSettings().setLoadWithOverviewMode(true);
            Browser.getSettings().setUseWideViewPort(true);
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            this.mProgress.hide();
            this.mProgress.dismiss();

            Message msg = new Message();
            msg.arg1 = 1;

            handler.sendMessage(msg);

            super.onPostExecute(result);
        }
    }

    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.arg1 == 1) {
            }
        }
    };

}

Answer 1

如评论所述，最好查看日志文件中的错误或logcat的内容

有一件事我注意到了我想要同时指出并覆盖了shouldOverrideUrlLoading ......这应该是在加载URL之前....

尝试放置Browser.loadUrl("http://www.google.com/");

在Browser.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL);

前面

根据我的理解，程序流程首先设置侦听器/覆盖，以便它们准备好响应，然后加载要拦截的URL。

Answer 2

确保 - 您是否在清单文件中添加了以下权限？ -

<uses-permission android:name="android.permission.INTERNET" />

自定义浏览器无法在android中运行

2 个答案: