主要活动到第二个活动以及通过按钮从第二个活动到主要活动

Question

主要活动到第二个活动以及通过按钮从第二个活动到主要活动。

我已经尝试过这段代码，但是当我点击按钮时它不会进入主要活动，我尝试了所有选项但它不起作用。

主活动

public class MainActivity extends AppCompatActivity {
    private WebView webview;
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        webview = (WebView) findViewById(R.id.webView);
        WebSettings webSettings = webview.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webview.loadUrl("http://www.google.com/");
        webview.setWebViewClient(new WebViewClient() {
            @Override
            public void onReceivedError(WebView view, int errorCode, String description,
                                        final String failingUrl) {
                setContentView(R.layout.activity_main2);

                super.onReceivedError(view, errorCode, description, failingUrl);


            }

        });
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                webview.loadUrl("http://www.google.com/");
            }
        });
    }
}

Main2Activity

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        findViewById(R.id.button2).setOnClickListener(new handleButton());
    }

    class handleButton implements View.OnClickListener {
        public void onClick(View v) {
            Intent intent = new Intent(Main2Activity.this, MainActivity.class);
            startActivity(intent);

        }
    }
}

ACTIVITY_MAIN.XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
   tools:context="ram.idea.MainActivity">

<WebView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/webView"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentBottom="true" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="HOME"
    android:id="@+id/button"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />
    </RelativeLayout>

ACTIVITY_MAIN2.XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="ram.idea.Main2Activity">

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Button"
    android:id="@+id/button2"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginLeft="82dp"
    android:layout_marginStart="82dp"
    android:layout_marginTop="135dp" />
   </RelativeLayout>

错误：

Android 清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ram.idea">
    <uses-permission android:name="android.permission.INTERNET" />
    <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".Main2Activity"></activity>
    </application>
</manifest>

Answer 1

我认为问题是，你没有进入Activity2Main，你只设置了视图。试试：

webview.setWebViewClient(new WebViewClient() {

    @Override
    public void onReceivedError(WebView view, int errorCode, String description,
                                final String failingUrl) {
        Intent intent = new Intent(MainActivity.this, Main2Activity.class);
       startActivity(intent);

        super.onReceivedError(view, errorCode, description, failingUrl);


    }

});

在您的 MainActivity 中。 您可以添加：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

     (Button) findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Intent intent = new Intent(Main2Activity.this, MainActivity.class);
           startActivity(intent);
        }
    });
}

完整的 MainActivity：

    public class MainActivity extends AppCompatActivity {
private WebView webview;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    webview = (WebView) findViewById(R.id.webView);
    WebSettings webSettings = webview.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setDomStorageEnabled(true);
    webview.loadUrl("http://www.google.com/");
    webview.setWebViewClient(new WebViewClient() {
        @Override
        public void onReceivedError(WebView view, int errorCode, String description,
                                    final String failingUrl) {
            Intent intent = new Intent(MainActivity.this, Main2Activity.class);// Try this
            startActivity(intent); //Try this
        }
    });
    button = (Button) findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            webview.loadUrl("http://www.google.com/");
        }
    });
}

}

希望能解决您的问题。

this happen when i added your code

Answer 2

尝试使用： 结束（）; startActivity(intent) 之后的方法；