我没有找到解决此特定问题的在线内容。我有一项使用Android相机应用拍摄照片或视频的活动。然后它从带有图像或视频的摄像机返回，并在视图中显示。当我处于相同的配置时，我的视频和图像，捕获和显示都可以正常工作。 但是，如果我从我的应用程序中启动相机，比如肖像，那么当我在相机应用程序中时，我决定将其更改为横向，然后一旦我从相机应用程序返回，我的图像显示空白{{ 1}}。如果我保持相同的配置，它可以正常工作。就像我以肖像画开始，并以肖像方式使用相机应用程序时，我的ImageView会在返回时显示图像。由于我无法为相机应用程序编写代码，因此不确定如何处理此问题。
但是，如果我在使用相机视频时更改方向，我的视频没有问题。当它返回我的应用程序时显示正常，无论我在应用程序或相机应用程序中的哪个方向。
但为什么图像有问题？我试图在ImageView和onSaveInstanceState中保存状态，但这不会影响任何内容。当我记录它们时，我在这些方法中得到所有变量的空值（对于视频也是如此）。我想因为它可能与我的Intent数据有更多关系？但这只是猜测。我查看onRestoreInstanceState，看不到任何遗漏。图像意图与视频意图略有不同，所以也许我错过了一些东西。
我有2个不同的Intent文件用于纵向和横向布局，但它们是相同的，位于正确的文件夹中。当我进行配置更改时，Android会自动选择它们。
如果有人有提示，非常感谢。
更新
我尝试在清单中添加一行代码：xml
我覆盖了android:configChanges="keyboardHidden|orientation|screenSize"，但现在我的图像又回到了黑屏。两个布局文件都在我的onConfigurationChanged()文件夹中。
layout更新2：
我解除了我在UPDATE 1中尝试过的所有内容。因为这给了我一个黑屏和其他无法修复的错误。
这一次，我在@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
setContentView(R.layout.activity_make_photo_video_land);
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
setContentView(R.layout.activity_make_photo_video);
}
}
中添加了一个配置选择器来手动更改视图：
onCreate更多日志记录后，我意识到当我更改相机应用程序中的配置 时，以下方法按此顺序执行（从第一个活动开始列出）：
// Checks the orientation of the screen
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
setContentView(R.layout.activity_make_photo_video_land);
mImageView = (ImageView) findViewById(R.id.taken_photo_land);
} else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
setContentView(R.layout.activity_make_photo_video);
mImageView = (ImageView) findViewById(R.id.taken_photo);
}
onCreate() - 我离开我的应用程序去相机
onSavedInstanceState() - 我从带照片的应用程序返回，mImageBitmap上的登录为空。
onCreate()
onRestoreInstanceState() - 然后处理从相机拍摄的照片。
我在inActivityResult()中唯一坚持的是onSavedInstanceState()，这是在mCurrentPhotoPath中运行setPic()方法所需要的。
在inActivityResult()中：
onSavedInstanceState()
在outState.putString("FILE_PATH", mCurrentPhotoPath);：
onCreate()此过程正常，位图值的登录不为空。那么为什么图像不会发布呢？
MakePhotoVideo.java
if (savedInstanceState != null) {
mCurrentPhotoPath = savedInstanceState.getString("FILE_PATH");
}
答案 0 :(得分：1)
经过我的所有试验和错误，我终于找到了问题。我的第二次更新非常接近，唯一的错误是在
mImageView.setVisibility(
savedInstanceState.getBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY) ?
ImageView.VISIBLE : ImageView.INVISIBLE
);
方法。我在onCreate中有这个，只有在通过空检查时才会执行，但我忘记的是，当相机应用程序中的配置发生变化时，图像位图会返回null，所以可见性将始终设置为不可见。如果位图不是 null，则IMAGEVIEW_VISIBILITY_STORAGE_KEY设置为true，如果位图为null，则设置为false。所以一旦我摆脱了这个，我的其他保存状态代码工作得非常好。以下是最终的工作代码。
<强> MakePhotoVideo.java
package org.azurespot.makecute;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
import org.azurespot.R;
import org.azurespot.cutecollection.CuteCollection;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Random;
public class MakePhotoVideo extends ActionBarActivity {
private static final int ACTION_TAKE_PHOTO = 1;
private static final int ACTION_TAKE_VIDEO = 2;
private static final String BITMAP_STORAGE_KEY = "viewbitmap";
private static final String IMAGEVIEW_VISIBILITY_STORAGE_KEY = "imageviewvisibility";
private ImageView mImageView;
private Bitmap mImageBitmap;
private static final String VIDEO_STORAGE_KEY = "viewvideo";
private static final String VIDEOVIEW_VISIBILITY_STORAGE_KEY = "videoviewvisibility";
private VideoView mVideoView;
private Uri mVideoUri;
private File fileVideo;
private String mCurrentPhotoPath;
String videoPath;
private int position = 0;
int targetH;
int targetW;
private static final String JPEG_FILE_PREFIX = "IMG_";
private static final String JPEG_FILE_SUFFIX = ".jpg";
private PhotoStorageDirFactory mPhotoStorageDirFactory = null;
/* Photo album for this application */
private String getAlbumName() {
return getString(R.string.album_name);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_make_photo_video);
mImageView = (ImageView) findViewById(R.id.taken_photo);
mVideoView = (VideoView) findViewById(R.id.video_view);
mImageView.setVisibility(View.VISIBLE);
mVideoView.setVisibility(View.INVISIBLE);
mImageView.setSaveEnabled(true);
Button photoBtn = (Button) findViewById(R.id.click);
setBtnListenerOrDisable(photoBtn, mTakePicOnClickListener, MediaStore.ACTION_IMAGE_CAPTURE);
Button videoBtn = (Button) findViewById(R.id.record_video);
setBtnListenerOrDisable(videoBtn, mTakeVidOnClickListener, MediaStore.ACTION_VIDEO_CAPTURE);
mPhotoStorageDirFactory = new BasePhotoDirFactory();
// Shows the up carat near app icon in ActionBar
getSupportActionBar().setDisplayUseLogoEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
public void viewCollection(View v){
// finishes/restarts the activity so the unsaved video does not corrupt
Intent intent = getIntent();
finish();
startActivity(intent);
// goes to Cute Collection activity
Intent i = new Intent(this, CuteCollection.class);
startActivity(i);
}
private File getAlbumDir() {
File storageDir = null;
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
storageDir = mPhotoStorageDirFactory.getAlbumStorageDir(getAlbumName());
if (storageDir != null) {
if (! storageDir.mkdirs()) {
if (! storageDir.exists()){
Log.d("Camera", "failed to create directory");
return null;
}
}
}
} else {
Log.v(getString(R.string.app_name), "External storage is not mounted READ/WRITE.");
}
return storageDir;
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = JPEG_FILE_PREFIX + timeStamp + "_";
File albumF = getAlbumDir();
File imageF = File.createTempFile(imageFileName, JPEG_FILE_SUFFIX, albumF);
return imageF;
}
private File setUpPhotoFile() throws IOException {
File f = createImageFile();
mCurrentPhotoPath = f.getAbsolutePath();
return f;
}
private void setPic() {
mImageView.setVisibility(View.VISIBLE);
mVideoView.setVisibility(View.INVISIBLE);
/* There isn't enough memory to open up more than a couple camera photos */
/* So pre-scale the target bitmap into which the file is decoded */
/* Get the size of the image */
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE){
targetH = 570;
targetW = 960;
} else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT){
targetH = 960;
targetW = 570;
}
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
/* Figure out which way needs to be reduced less */
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
/* Set bitmap options to scale the image decode target */
bmOptions.inJustDecodeBounds = false;
bmOptions.inPreferredConfig = Bitmap.Config.RGB_565;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inBitmap = mImageBitmap;
bmOptions.inPurgeable = true;
/* Decode the JPEG file into a Bitmap */
mImageBitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
mImageBitmap = rotateBitmap(mImageBitmap, 90);
}
savePhoto(mImageBitmap);
/* Associate the Bitmap to the ImageView, make sure the VideoView
* is cleared to replace with ImageView */
mImageView.setImageBitmap(mImageBitmap);
mVideoUri = null;
}
// save your photo to SD card
private void savePhoto(final Bitmap bitmapPhoto){
// set OnClickListener to save the photo
mImageView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
boolean success = false;
File photoDir = new File(Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_PICTURES) + "/Cute Photos");
photoDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String photoName = "Photo"+ n +".jpg";
File filePhoto = new File (photoDir, photoName);
try {
FileOutputStream out = new FileOutputStream(filePhoto);
bitmapPhoto.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
success = true;
} catch (Exception e) {
e.printStackTrace();
}
if (success) {
Toast toast = Toast.makeText(getApplicationContext(), "Cute photo saved!",
Toast.LENGTH_LONG);
LinearLayout toastLayout = (LinearLayout) toast.getView();
toastLayout.setBackgroundColor(getResources().getColor(R.color.toast_color));
TextView toastTV = (TextView) toastLayout.getChildAt(0);
toastTV.setTextSize(30);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 80);
toast.show();
} else {
Toast.makeText(getApplicationContext(),
"Error during image saving", Toast.LENGTH_SHORT).show();
}
}
});
}
// save your video to SD card
protected void saveVideo(final Uri uriVideo){
// click the video to save it
mVideoView.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
boolean success = false;
if(event.getAction() == MotionEvent.ACTION_UP) {
try {
// make the directory
File vidDir = new File(android.os.Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_MOVIES) + File.separator + "Cute Videos");
vidDir.mkdirs();
// create unique identifier
Random generator = new Random();
int n = 100;
n = generator.nextInt(n);
// create file name
String videoName = "Video" + n + ".mp4";
fileVideo = new File(vidDir.getAbsolutePath(), videoName);
videoPath = fileVideo.getAbsolutePath();
Log.d("TAG", "Value of videoPath:" + videoPath);
fileVideo.setWritable(true, false);
OutputStream out = new FileOutputStream(fileVideo);
InputStream in = getContentResolver().openInputStream(uriVideo);
byte buffer[] = new byte[1024];
int length = 0;
while ((length = in.read(buffer)) > 0) {
out.write(buffer, 0, length);
}
out.close();
in.close();
success = true;
} catch (Exception e) {
e.printStackTrace();
}
if (success) {
Toast toast = Toast.makeText(getApplicationContext(), "Cute video saved!",
Toast.LENGTH_SHORT);
LinearLayout toastLayout = (LinearLayout) toast.getView();
toastLayout.setBackgroundColor(getResources().getColor(R.color.toast_color));
TextView toastTV = (TextView) toastLayout.getChildAt(0);
toastTV.setTextSize(30);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 80);
toast.show();
} else {
Toast.makeText(getApplicationContext(),
"Error during video saving", Toast.LENGTH_SHORT).show();
}
}
return true;
}
});
}
public Bitmap rotateBitmap(Bitmap source, int angle)
{
Matrix matrix = new Matrix();
matrix.set(matrix);
matrix.setRotate(angle);
return Bitmap.createBitmap(source, 0, 0, source.getWidth(),
source.getHeight(), matrix, false);
}
private void galleryAddPic() {
Intent mediaScanIntent = new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE");
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
private void dispatchTakePictureIntent(int actionCode) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
switch(actionCode) {
case ACTION_TAKE_PHOTO:
File f;
try {
f = setUpPhotoFile();
Log.d("TAG", "Value of f in picture intent: " + f);
mCurrentPhotoPath = f.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
} catch (IOException e) {
e.printStackTrace();
f = null;
mCurrentPhotoPath = null;
}
break;
default:
break;
} // switch
startActivityForResult(takePictureIntent, actionCode);
}
// Captures video from Android camera component
protected void dispatchTakeVideoIntent() {
Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {
// set the video image quality to high
takeVideoIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
startActivityForResult(takeVideoIntent, ACTION_TAKE_VIDEO);
}
}
private void handleCameraPhoto() {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
if (mCurrentPhotoPath != null) {
setPic();
galleryAddPic();
mCurrentPhotoPath = null;
}
}
// Post recorded video into VideoView
private Uri handleCameraVideo(Intent intent) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
mVideoUri = intent.getData();
mVideoView.setVideoURI(mVideoUri);
mImageBitmap = null;
mVideoView.setVisibility(View.VISIBLE);
mImageView.setVisibility(View.INVISIBLE);
mVideoView.start();
// saves video to file
saveVideo(mVideoUri);
return mVideoUri;
}
// click listener for the Android Camera button (not my app's button)
Button.OnClickListener mTakePicOnClickListener =
new Button.OnClickListener() {
@Override
public void onClick(View v) {
// mImageBitmap = null;
dispatchTakePictureIntent(ACTION_TAKE_PHOTO);
// releases the orientation lock
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
}
};
Button.OnClickListener mTakeVidOnClickListener =
new Button.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakeVideoIntent();
// releases the orientation lock
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
}
};
// Intent data is how the photo and video transfer into their views
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case ACTION_TAKE_PHOTO: {
if (resultCode == RESULT_OK) {
handleCameraPhoto();
}
break;
}
case ACTION_TAKE_VIDEO: {
if (resultCode == RESULT_OK) {
handleCameraVideo(data);
}
break;
}
}
}
// Some lifecycle callbacks so that the image can survive orientation change
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putParcelable(BITMAP_STORAGE_KEY, mImageBitmap);
outState.putParcelable(VIDEO_STORAGE_KEY, mVideoUri);
outState.putBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY, (mImageBitmap != null) );
outState.putBoolean(VIDEOVIEW_VISIBILITY_STORAGE_KEY, (mVideoUri != null) );
outState.putString("FILE_PATH", mCurrentPhotoPath);
if (mVideoUri != null) {
// use onSaveInstanceState in order to store the video or photo
outState.putInt("PositionVideo", mVideoView.getCurrentPosition());
// playback position for orientation change
mVideoView.pause();
}
// super should be last in this method
super.onSaveInstanceState(outState);
}
// this is called after onCreate (when returning from camera app),
// so br careful what you put here
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
mCurrentPhotoPath = savedInstanceState.getString("FILE_PATH");
mVideoUri = savedInstanceState.getParcelable(VIDEO_STORAGE_KEY);
mVideoView.setVideoURI(mVideoUri);
mVideoView.setVisibility(
savedInstanceState.getBoolean(VIDEOVIEW_VISIBILITY_STORAGE_KEY) ?
ImageView.VISIBLE : ImageView.INVISIBLE
);
if (mVideoUri != null) {
// for video, restores position it was playing
position = savedInstanceState.getInt("PositionVideo");
mVideoView.seekTo(position);
}
super.onRestoreInstanceState(savedInstanceState);
}
/**
* Indicates whether the specified action can be used as an intent. This
* method queries the package manager for installed packages that can
* respond to an intent with the specified action. If no suitable package is
* found, this method returns false.
* http://android-developers.blogspot.com/2009/01/can-i-use-this-intent.html
*
* @param context The application's environment.
* @param action The Intent action to check for availability.
*
* @return True if an Intent with the specified action can be sent and
* responded to, false otherwise.
*/
public static boolean isIntentAvailable(Context context, String action) {
final PackageManager packageManager = context.getPackageManager();
final Intent intent = new Intent(action);
List<ResolveInfo> list =
packageManager.queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
}
private void setBtnListenerOrDisable(Button btn, Button.OnClickListener onClickListener,
String intentName) {
if (isIntentAvailable(this, intentName)) {
btn.setOnClickListener(onClickListener);
} else {
btn.setClickable(false);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Makes the UP caret go back to the previous fragment MakeCuteFragment
switch (item.getItemId()) {
case android.R.id.home:
android.app.FragmentManager fm= getFragmentManager();
fm.popBackStack();
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
答案 1 :(得分：0)
您好我们在我们的产品中遇到同样的问题，我们应用以下解决方案它工作正常，实际上我们的客户端有三星设备。让我们打开您的Android清单文件，看看MakePhotoVideo活动。请参阅下面您必须在活动标签中添加的内容。
<activity android:name=".MakePhotoVideo "
android:label="@string/app_name" android:configChanges="keyboardHidden|orientation">
实际上有很多与相机意图相关的用例，特别是三星设备由于本机应用程序的自定义而存在大部分问题，将此属性应用于您的活动标签。如果您有任何问题，请告诉我。谢谢。
答案 2 :(得分：0)
无论相机应用程序在满足您的意图时发生什么，都会导致系统破坏您的活动，因为它需要更多内存。
您需要覆盖onSaveInstanceState(Bundle savedInstanceState)并保存ImageView状态，也可能保存其他值。有关详细信息，请参阅Saving Activity state in Android的答案。
在创建活动以回答其startActivityForResult()时，您应该小心恢复应用状态，如here所述。
答案 3 :(得分：0)
尝试在onSaveInstanceState（）中接收位图：
mCurrentPhotoPath = savedInstanceState.getString（＆＃34; FILE_PATH＆＃34;）;
mImageBitmap = savedInstanceState.getParceable（＆＃34; BITMAP_STORAGE_KEY＆＃34;）;
mImageView.setImageBitmap(mImageBitmap);
mImageView.setVisibility(
savedInstanceState.getBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY) ?
ImageView.VISIBLE : ImageView.INVISIBLE
);