防止在Rotate上重新加载WebView - Android Studio [英] Preventing WebView reload on Rotate - Android Studio
问题描述
当我旋转屏幕时,WebView会重新加载整个页面。所以我在Android_Manifest.xml文件中禁用了旋转,但如果我可以进行旋转,那将非常酷。
When I rotate my screen, the WebView reloads the whole page. So I disabled rotation in Android_Manifest.xml file, but it would be really cool if I could make rotation possible.
SkateTube.java -
SkateTube.java -
package com.example.skatetube.skatetube;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class SkateTube extends AppCompatActivity {
private WebView mWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_skatetube);
mWebView = (WebView) findViewById(R.id.activity_main_webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
if (savedInstanceState == null)
{
mWebView.loadUrl("http://skatetube.sytes.net/");
mWebView.setWebViewClient(new WebViewClient());
}
@Override
public void onBackPressed() {
if(mWebView.canGoBack()) {
mWebView.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_skate_tube, 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);
}
}
Android_manifest.xml
Android_manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.skatetube.skatetube">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".SkateTube"
android:theme="@style/AppTheme.NoActionBar"
android:configChanges="keyboard|keyboardHidden|orientation"
android:label="State preserving implementation"/>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
推荐答案
必须完成3点。这对我来说是一个完整的解决方案。
There are 3 points must be done. This is a full solution for me.
-
AndroidManifest.xml需要配置方向和:目标活动的configChanges
AndroidManifest.xml need config both orientation and screenSize in android:configChanges for target activity
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.skatetube.skatetube">
<application
<activity android:name=".WebViewActivity"
android:configChanges="orientation|screenSize"
</activity>
</application>
</manifest>
需要覆盖 onSaveInstanceState 和 onRestoreInstanceState
Need override onSaveInstanceState and onRestoreInstanceState of Activity to make state can be restore when rotated
@Override
protected void onSaveInstanceState(Bundle outState )
{
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
mWebView.restoreState(savedInstanceState);
}
不在屏幕上再次加载网址旋转,使用 savedInstanceState 来了解目标活动的ocCreate()中的当前状态
Not load URL again when screen rotate, use savedInstanceState to know current status in ocCreate() of target activity
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
mWebView = (WebView) findViewById(R.id.webView_h5);
if (savedInstanceState == null) {
mWebView.loadUrl(url);
}
}
错过这三个中的任何一个,我的活动仍在重新加载。
Miss any one of those three, my activity still reload.
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