Question

我有Activity只显示图片。我想在旋转手机时旋转图像。我已经阅读了几乎所有关于方向变化的SO帖子，这就是我所做的：

AlternateFullImageActivity.java

public class AlternateFullImageActivity extends me.imid.swipebacklayout.lib.app.SwipeBackActivity {

    String API;
    String photoId;
    String token;
    TinyDB tinyDB;
    RestAdapter restAdapter;
    @Bind(R.id.zoomable)
    ImageView image;
    PhotoViewAttacher mAttacher;
    Bitmap bmp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_alternate_full_image);
        SwipeBackLayout mSwipeBackLayout = getSwipeBackLayout();
        mSwipeBackLayout.setEdgeTrackingEnabled(SwipeBackLayout.EDGE_ALL);

        ButterKnife.bind(this);
        Log.i("PP", "AlternateFullImageActivity called");

        Intent intent = getIntent();
        photoId = intent.getExtras().getString("ID");

        RequestInterceptor requestInterceptor = new RequestInterceptor() {
            @Override
            public void intercept(RequestFacade request) {
                request.addHeader("Accept", "application/json");
                request.addHeader("Authorization", "Token " + token);
            }
        };
        OkHttpClient okHttpClient = new OkHttpClient();
        restAdapter = new RestAdapter.Builder()
                .setClient(new OkClient(okHttpClient))
                .setLogLevel(RestAdapter.LogLevel.FULL)
                .setEndpoint(API)
                .setRequestInterceptor(requestInterceptor)
                .build();

        PhotoAPI photoAPI = restAdapter.create(PhotoAPI.class);
        photoAPI.getFeed(photoId, new Callback<ImageItem>() {
            @Override
            public void success(ImageItem imageItem, Response response) {
                Picasso.with(AlternateFullImageActivity.this)
                        .load(imageItem.getPhotoUrl())
                        .into(new Target() {
                            @Override
                            public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
                                bmp = bitmap;
                                image.setImageBitmap(bmp);
                            }

                            @Override
                            public void onBitmapFailed(Drawable errorDrawable) {

                            }

                            @Override
                            public void onPrepareLoad(Drawable placeHolderDrawable) {

                            }
                        });
                mAttacher = new PhotoViewAttacher(image);
            }

            @Override
            public void failure(RetrofitError error) {

            }
        });
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        Log.i("PP", "onConfigurationChanged called");
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
            image.setImageBitmap(bmp);
        } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
            Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
            image.setImageBitmap(bmp);
        }
    }

activity_alternate_full_image.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"
    android:background="#000000"
    tools:context="com.galleri5.android.activities.AlternateFullImageActivity">

    <uk.co.senab.photoview.PhotoView
        android:id="@+id/zoomable"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true" />

</RelativeLayout>

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.galleri5.android">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <permission android:name="com.galleri5.android.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />
    <uses-permission android:name="com.galleri5.android.permission.C2D_MESSAGE" />

    <uses-feature
        android:name="android.hardware.camera"
        android:required="false" />

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:hardwareAccelerated="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:theme="@style/AppTheme"
        tools:replace="android:icon">

        <activity
            android:name=".activities.LaunchActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".activities.FullImageActivity"
            android:screenOrientation="portrait"></activity>
        <activity
            android:name=".activities.AlternateFullImageActivity"
            android:configChanges="layoutDirection|uiMode|screenSize|orientation">
        </activity>
    </application>

问题是即使在旋转手机时也根本没有调用onConfigurationChanged()。为了检查问题所在，我创建了一个新项目，只有一个活动显示一个图像，并在清单文件中添加相同的配置标志，并在那里工作。我无法弄清问题是什么以及如何解决它。

修改

我注意到另一件事，当我在清单文件中为我的活动添加android:screenOrientation="sensor"时，图片会在旋转手机时旋转，但会调用onCreate()以及onConfigurationChanged()每次我旋转手机。现在假设这个活动用C表示，那么此时活动后栈是A-B-C。每次我旋转手机时，A的onCreate也会被调用，这对我来说非常奇怪。我真的没有想法。我绝对不希望再次调用任何活动onCreate。任何帮助都将受到高度赞赏。

Answer 1

如果我是你，我会采取以下方法。（我没有测试过这段代码，但它应该给你指示如何继续）

如果您实施以下方法，则无需担心添加configChanges并手动处理方向更改。另外，建议不要使用onConfigurationChanged。

使用onSaveInstanceState在活动娱乐中保留网址，并使用onCreate，如下所示。

private static final String KEY_URL = "url";
private String mUrl = null;

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

 if (savedInstanceState != null && savedInstanceState.getString(KEY_URL) != null) {
  mUrl = savedInstanceState.getString(KEY_URL);
  loadImage(mUrl);
 } else {
  fetchNetworkUrl();
 }
}

private void fetchNetworkUrl() {
        // Service call and call following when you receive the url.

        photoAPI.getFeed(photoId, new Callback<ImageItem>() {
            @Override
            public void success(ImageItem imageItem, Response response) {
                mUrl = imageItem.getPhotoUrl();
                loadImage(mUrl);
            }
        }
    }

private void loadImage(String url){
        // Use Picasso to load Image
}

在

之后的活动娱乐使用中保留网址

@Override
protected void onSaveInstanceState(Bundle outState) {
 outState.putString(KEY_URL, mUrl);
 super.onSaveInstanceState(outState);
}

onConfigurationChanged（）未调整方向更改

1 个答案: