java - 一项 Activity 中有 2 个 Action

Question

我有一个带有 WebView 和 Button 的 Activity。

我想在按下 Button 时转到下一个 Activity，但我不知道如何操作。

当用户点击Button时，他将被“传送”到MainActivity。我有个问题。

它被标记为红色。我不知道该怎么做。有人可以给我示例答案并更正我的代码吗？

有代码:

  package musial.pzstis.com.pzstiz;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;

public class Main10Activity extends Activity {
    private WebView myWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main10);
        myWebView = (WebView) findViewById(R.id.webView6);
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        myWebView.loadUrl("https://docs.google.com/viewer?url=http://pzstiz.swiebodzin.pl/zastepstwa/PZSTiZ_zastepstwa.pdf");
        myWebView.setWebViewClient(new WebViewClient());
        myWebView.getSettings().setBuiltInZoomControls(true);
        myWebView.getSettings().setLoadWithOverviewMode(true);
        myWebView.getSettings().setUseWideViewPort(true);
        webSettings.setBuiltInZoomControls(true);
        webSettings.setSupportZoom(true);
        myWebView.getSettings().setUseWideViewPort(true);
        myWebView.getSettings().setLoadWithOverviewMode(true);
        myWebView.setInitialScale(190);
        myWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
        myWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);


    }

    @Override
    public void onBackPressed() {
        if (myWebView.canGoBack()) {
            myWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }

    @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);
    }
    Button button2;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        button2 = (Button) findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(Main10Activity.this, MainActivity.class));
            }
        });

    }
}

Answer 1

Activity 中不能有 2 个 OnCreate() 方法。删除第二个onCreate()方法，并将第二个onCreate()中编写的代码复制到第一个onCreate()中。