java - android 用相机拍摄多张图像

Question

我已经编写了使用设备内置相机捕获图像并将其存档在数据库服务器中的代码。每次我捕获图像并查看它时，它都会动态生成另一个 ImageView 布局(例如:图像是 ic_launcher) 。

每当点击 ic_launcher 图像时，它将转到 MainActivity.java 页面，使用 intent 拍摄另一张图像。

我的问题是，如何在 uploadActivity.java 中查看所有捕获的图像/存档图像？

注意:图片是在uploadactivity.java

中查看的

ma​​inactivity.java

 private void captureImage() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

    // start the image capture Intent
    startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}
 @Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    // save file url in bundle as it will be null on screen orientation
    // changes
    outState.putParcelable("file_uri", fileUri);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);

    // get the file url
    fileUri = savedInstanceState.getParcelable("file_uri");
}



/**
 * Receiving activity result method will be called after closing the camera
 * */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // if the result is capturing Image
    if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {

            launchUploadActivity(true);


        } else if (resultCode == RESULT_CANCELED) {

            // user cancelled Image capture
            Toast.makeText(getApplicationContext(),
                    "User cancelled image capture", Toast.LENGTH_SHORT)
                    .show();

        } else {
            // failed to capture image
            Toast.makeText(getApplicationContext(),
                    "Sorry! Failed to capture image", Toast.LENGTH_SHORT)
                    .show();
        }

    }
}

private void launchUploadActivity(boolean isImage){
    Intent i = new Intent(MainActivity.this, UploadActivity.class);
    i.putExtra("filePath", fileUri.getPath());
    i.putExtra("isImage", isImage);
    startActivity(i);
}

/**
 * ------------ Helper Methods ---------------------- 
 * */


public Uri getOutputMediaFileUri(int type) {
    return Uri.fromFile(getOutputMediaFile(type));
}


private static File getOutputMediaFile(int type) {

    // External sdcard location
    File mediaStorageDir = new File(
            Environment
                  .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            Config.IMAGE_DIRECTORY_NAME);

    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(TAG, "Oops! Failed create "
                    + Config.IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());
    File mediaFile;
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");


    return mediaFile;
}

UploadActivity.java

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_upload);

    txtPercentage = (TextView) findViewById(R.id.txtPercentage);
    btnUpload = (Button) findViewById(R.id.btnUpload);      
    Button  btnTaking = (Button)findViewById(R.id.btntake);
    layout2 = (LinearLayout) findViewById(R.id.ly2);
    progressBar = (ProgressBar) findViewById(R.id.progressBar);
    vidPreview = (VideoView) findViewById(R.id.videoPreview);


    // Changing action bar background color
    getActionBar().setBackgroundDrawable(
            new ColorDrawable(Color.parseColor(getResources().getString(
                    R.color.action_bar))));

    // Receiving the data from previous activity
    Intent intent = getIntent();

    // image or video path that is captured in previous activity
    filePath = intent.getStringExtra("filePath");


    ArrayList<String> yourFilePaths = new ArrayList<>();// Create ArrayList

    // first you have to check if you've saved filepaths
    SharedPreferences prefs = getSharedPreferences("SavedFilePaths",
            Context.MODE_PRIVATE);
    String myJSONArrayString = prefs.getString("SavedFilePathsJSONArray",
            "");
    if (!myJSONArrayString.isEmpty()) {
        JSONArray jsonArray = null;
        try {
            jsonArray = new JSONArray(myJSONArrayString);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        for (int i = 0; i < jsonArray.length(); i++) {
            try {
                yourFilePaths.add(jsonArray.get(i).toString());
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }


    // add the last photo you've taken
    yourFilePaths.add(filePath);
    // Save the new ArrayList in SharedPreferences:
    JSONArray mJSONArray = new JSONArray(yourFilePaths);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString("SavedFilePathsJSONArray", mJSONArray.toString());

    // Show images by filePaths
    File imgFile;
    for (int i = 0; i < yourFilePaths.size(); ++i) {
        imgFile = new File(yourFilePaths.get(i));
        if (imgFile.exists()) {
              final BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize = 8;

               Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(),options);

            ImageView myImage = new ImageView(this);

            myImage.setImageBitmap(myBitmap);// In this step you've to
                                                // create dynamic imageViews
                                                // to see more than one
                                                // picture
            layout2.addView(myImage);// Then add your dynamic imageviews to
                                    // your layout

        }
    }

    btnTaking.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        Intent intent = new Intent(UploadActivity.this, MainActivity.class);
        startActivity(intent);
        }
    });

    btnUpload.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // uploading the file to server
            new UploadFileToServer().execute();
        }
    });

}

Activity_Upload

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/view_background"
android:orientation="vertical"
android:padding="10dp" >

<!-- To display picture taken -->


<LinearLayout
    android:id="@+id/ly2"
    android:layout_width="wrap_content"
    android:layout_height="100dp"
    android:orientation="vertical" >

</LinearLayout>

<TextView
    android:id="@+id/txtPercentage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginBottom="15dp"
    android:layout_marginTop="15dp"
    android:textColor="@color/txt_font"
    android:textSize="30dp" />

<ProgressBar
    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="fill_parent"
    android:layout_height="20dp"
    android:layout_marginBottom="35dp"
    android:visibility="gone" />

<Button
    android:id="@+id/btnUpload"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginBottom="20dp"
    android:background="@color/btn_bg"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
    android:text="@string/btnUploadToServer"
    android:textColor="@color/white"
    android:visibility="gone"
     />
<TextView 
    android:id="@+id/idt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    />

<Button
    android:id="@+id/btntake"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginBottom="20dp"
    android:background="@color/btn_bg"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
    android:text="Take Another Picture"
    android:textColor="@color/white" />

输出

注意:我从 androidhive

获得了这段代码

Answer 1

好的，现在我想我明白你的问题了。要了解我的代码，请查看:

what is sharedPreferences?

Show Image View from file path in android?

Create ImageViews dynamically inside a loop

上次编辑:添加commit()解决问题

我们要尝试的是将文件路径保存在 ArrayList 中，并将该数组保存在 SharedPreferences 中:

layout_example.xml <-- 在您的 xml 上创建一个布局以在其中添加 imageViews

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dp"
    android:padding="5dp">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:id="@+id/myLinearLayout"></LinearLayout>
</RelativeLayout>

UploadActivity.java

     Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_upload);//add the LinearLayout of the layout_example.xml

    txtPercentage = (TextView) findViewById(R.id.txtPercentage);
    btnUpload = (Button) findViewById(R.id.btnUpload);
    layout = (LinearLayout) findViewById(R.id.ly1);
    progressBar = (ProgressBar) findViewById(R.id.progressBar);
    imgPreview = (ImageView) findViewById(R.id.imgPreview);

    addImageView(layout);

    // Changing action bar background color
    getActionBar().setBackgroundDrawable(
            new ColorDrawable(Color.parseColor(getResources().getString(
                    R.color.action_bar))));

    // Receiving the data from previous activity
    Intent i = getIntent();

    // image or video path that is captured in previous activity
    filePath = i.getStringExtra("filePath");

   LinearLayour ly_myLayout = (LinearLayout)findViewById(R.id.myLinearLayout);
   ArrayList<String> yourFilePaths = new ArrayList<>();//Create ArrayList

    //first you have to check if you've saved filepaths
    SharedPreferences prefs = getSharedPreferences("SavedFilePaths",   Context.MODE_PRIVATE);
    String myJSONArrayString = prefs.getString("SavedFilePathsJSONArray", "");
    if(!myJSONArrayString.isEmpty()){
    JSONArray jsonArray = new JSONArray(myJSONArrayString);
      for (int i=0;i<jsonArray.length();i++){ 
        yourFilePaths.add(jsonArray.get(i).toString());
       } 
    }
    //add the last photo you've taken
     yourFilePaths.add(filePath);

    //Save the new ArrayList in SharedPreferences:
     JSONArray mJSONArray = new JSONArray(yourFilePaths);
     SharedPreferences.Editor editor = prefs.edit();
     editor.putString("SavedFilePathsJSONArray",mJSONArray.toString()).commit(); // add commit

    //Show images by filePaths             
    File imgFile;
      for (int i = 0; i < yourFilePaths.size(); ++i) {
        imgFile = new  File(yourFilePaths.get(i));
        if(imgFile.exists()){

        Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

        ImageView myImage = new ImageView(this);

        myImage.setImageBitmap(myBitmap);// In this step you've to create dynamic imageViews to see more than one picture

        ly_myLayout.addView(myImage);//Then add your dynamic imageviews to your layout

        }
      }

    btnUpload.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // uploading the file to server
            new UploadFileToServer().execute();
        }
    });

}

/**
 * Displaying captured image/video on the screen
 * */
private void previewMedia(boolean isImage) {
    // Checking whether captured media is image or video
    if (isImage) {
        imgPreview.setVisibility(View.VISIBLE);
        vidPreview.setVisibility(View.GONE);
        // bimatp factory
        BitmapFactory.Options options = new BitmapFactory.Options();

        // down sizing image as it throws OutOfMemory Exception for larger
        // images
        options.inSampleSize = 8;

        final Bitmap bitmap = BitmapFactory.decodeFile(filePath, options);

        imgPreview.setImageBitmap(bitmap);

    } 
}

    private void addImageView(LinearLayout layout) {
    i = 0;
    ImageView imageView = new ImageView(this);
    imageView.setImageResource(R.drawable.ic_launcher);
    imageView.setId(i);
    layout.addView(imageView);
    imageView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(UploadActivity.this,
                    MainActivity.class);
            startActivity(intent);
        }
    });
}

解决您的问题？