Android:也许 FEATURE_PROGRESS 导致应用程序不幸停止

Question

下面的代码有问题

package com.example.ch13_searchflickrr;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;

public class MainActivity extends ActionBarActivity {

WebView wv;
String query = "";
String baseURL = "http://m.flickr.com/#/search/advanced/_QM_q_IS_";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
    setContentView(R.layout.activity_main);

    wv = (WebView) findViewById(R.id.wv);
    wv.getSettings().setJavaScriptEnabled(true);
    wv.setWebChromeClient(new WebChromeClient(){
        public void onProgressChanged(WebView view, int progress){
            setProgress(progress*100);
        }
    });
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event){
    if(keyCode==KeyEvent.KEYCODE_BACK &&
            wv.canGoBack()){
        wv.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

public void search(View v){


}

@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;
}

@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);
}
}

在执行上面的代码时，它将显示不幸停止。

但是如果我删除该行:

this.getWindow().requestFeature(Window.FEATURE_PROGRESS);

然后应用程序可以运行，所以，我认为问题出在这里，但是，我不知道如何正确使用那条线，谁能给点建议？谢谢!

Answer 1

LogCat 显示

requestfeature must be called before adding content

为了解决这个问题，

requestFeature(Window.FEATURE_PROGRESS); 必须在 super.onCreate(savedInstanceState); 之前调用

应该是:

this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);