android使用webview時按后退退出的問題

使用webview打包圖片站點http://www.gg4493.cn，代碼都好了，具體如下

 

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         WebView webView=new WebView(this);
        webView.getSettings().setJavaScriptEnabled(true);//支持js
webView.loadUrl("http://www.gg4493.cn");//這里的就會加載網址:http://www.gg4493/到webview中
        webView.setWebViewClient(new MyWebViewClient());


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @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();

        //noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

 

一切貌似很完美，玩游戲，被電腦打敗了，點擊“更多游戲”去查看其他游戲，然后點返回鍵，問題來了，不是挖掘技術哪家強，是webview沒有后退功能，沒法退回首頁，而是直接退出，android開發問題還真多啊，還好哥機靈，找資料唄！

終於找到問題了，

只需要重寫activity的onKeyDown方法，在onKeyDown里后退即可

public boolean onKeyDown(int keyCode ,KeyEvent keyEvent){
if(keyCode==keyEvent.KEYCODE_BACK){//監聽返回鍵，如果可以后退就后退
if(webView.canGoBack()){
webView.goBack();
return true;
}
}
return super.onKeyDown(keyCode, keyEvent);

}

 

全部代碼貼出，免得以后忘記

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;


public class MainActivity extends Activity {
private WebView webView;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
init();
}


@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;
}


private void init() {
webView = new WebView(this);
  webView.loadUrl("http://www.gg4493.cn/");
  WebSettings settings = webView.getSettings();
  settings.setJavaScriptEnabled(true);
  webView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
  view.loadUrl(url);
return true;
}

});
setContentView(webView);
} 
public boolean onKeyDown(int keyCode ,KeyEvent keyEvent){
if(keyCode==keyEvent.KEYCODE_BACK){
if(webView.canGoBack()){
webView.goBack();
return true;
}
}
return super.onKeyDown(keyCode, keyEvent);

}
}