Question

我正在使用Android Studio。当我执行代码拍照时，预览始终以横向模式显示，但图像以纵向保存如何让预览以纵向模式显示？

package com.example.scanbarcode.scanbarcode;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

public class TakePhotoActivity extends AppCompatActivity {
    private Button takePictureButton;
    private Button nextButton;
    private ImageView imageView;
    private Uri file;
    private String FILE_NAME = "filename";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_take_photo);

        takePictureButton = (Button) findViewById(R.id.button_image);
        nextButton = (Button)findViewById(R.id.button_next);
        imageView = (ImageView) findViewById(R.id.imageview);

        nextButton.setEnabled(false);
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            takePictureButton.setEnabled(false);
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == 0) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
                    && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                takePictureButton.setEnabled(true);
            }
        }
    }

    public void takePicture(View view) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        file = Uri.fromFile(getOutputMediaFile());
        intent.putExtra(MediaStore.EXTRA_OUTPUT, file);

        startActivityForResult(intent, 100);
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 100) {
            if (resultCode == RESULT_OK) {
                imageView.setImageURI(file);
                Intent intent1 = new Intent();
                intent1.putExtra(FILE_NAME, file.getPath());
                if ((file != null)&&(file.getPath().length() != 0)){
                    nextButton.setEnabled(true);
                }
                setResult(RESULT_OK, intent1);
            }
        }
    }

    private static File getOutputMediaFile(){
        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), "CameraDemo");

        if (!mediaStorageDir.exists()){
            if (!mediaStorageDir.mkdirs()){
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        return new File(mediaStorageDir.getPath() + File.separator +
                "IMG_"+ timeStamp + ".jpg");
    }

    public void nextOnClick(View view){
        this.finish();
    }
}

和布局。

<?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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
    android:screenOrientation="portrait"
    android:id="@+id/activity_take_photo"
tools:context="com.example.scanbarcode.scanbarcode.TakePhotoActivity">


<ImageView
    android:id="@+id/imageview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerHorizontal="true" />

<Button
    android:id="@+id/button_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerInParent="true"
    android:onClick="takePicture"
    android:layout_alignBottom="@id/imageview"
    android:text="Take a picture!"/>

<Button
    android:id="@+id/button_next"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:text="Next"
    android:layout_alignBottom="@id/imageview"
    android:layout_toRightOf="@+id/button_image"
    android:onClick="nextOnClick"/>

</RelativeLayout>

Answer 1

没有＆＃34;标准＆＃34;相机应用程序制造商通常会自己发货。

无论如何，至少通过标准ACTION_IMAGE_CAPTURE协议，您无法控制任何相机应用程序的预览内部行为。某些相机应用可能会公开自己的API，而这样的API可能会允许对预览进行一些控制。

因此，如果您有相机应用预览的可重现问题，请确定相机应用的开发者，并尝试向他们提交错误报告。

Android系统。 Mashmallow。相机预览始终处于横向模式

1 个答案: