android studio摄像头区域有黑边

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编程梦想实现家 2024-10-29 20:47:20

文章标签 移动开发 java android ide 文章分类 Android 移动开发

Android Camera 三星BUG :

近期在Android项目中使用拍照功能 , 其他型号的手机执行成功了只有在三星的相机上遇到了bug .

BUG详细体现为 :

(1) 摄像头拍照后图片数据不一定能返回 ; onActivityResult的data为空

(2) 三星的camera强制切换到横屏导致Activity重新启动生命周期 (可是部分机型配置 android:configChanges 也不能阻止横竖屏切换);

我的解决方法为

假设 activity 的销毁假设无法避免那么在activity销毁之前调用 onSaveInstanceState 保存图片的路径

当activity又一次创建的时候会将 onSaveInstanceState 保存的文件传递给onCreate()其中

在onCreate其中检查照片的地址是否存在文件以此来判定拍照是否成功

运气不错最终通过了測试同学们的验证.....

我的代码例如以下:

配置 Androidmanifest.xml 中的配置 activity

<activity
            android:name=".UseCameraActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|navigation"
            android:launchMode="singleTop"
            android:screenOrientation="portrait" />

添加权限:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

贴上代码:

1) 主activity

功能是: 依据指定的路径生成bitmap ; 显示图片

package com.example.camerabaozi;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

import com.nostra13.universalimageloader.core.ImageLoader;

/**
 * 启动界面
 * 
 * 照片生成的文件夹在 sd卡的/a/image/camera/.. .jpg
 * 
 * @author baozi
 * 
 */
public class MainActivity extends Activity {

	protected static final int REQCAMERA = 11;
	private static final String TAG = "MainActivity";
	private View button1;
	private ImageView photo_iv;
	private ContentResolver mContentResolver;
	final int IMAGE_MAX_SIZE = 1024;

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

		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity.this,
						UseCameraActivity.class);
				startActivityForResult(intent, REQCAMERA);
			}
		});
		photo_iv = (ImageView) findViewById(R.id.imageView1);

	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		switch (requestCode) {
		case REQCAMERA:
			String path = data.getStringExtra(UseCameraActivity.IMAGE_PATH);
			Log.i("123", path);

			// 依据照片的位置获取图片
			Bitmap bitmap = getBitmap(path);
			photo_iv.setImageBitmap(bitmap);

			// ImageLoader.getInstance().displayImage(
			// getImageUri(path).toString(), photo_iv);

			break;

		default:
			super.onActivityResult(requestCode, resultCode, data);
			break;
		}

	}

	private Uri getImageUri(String path) {

		return Uri.fromFile(new File(path));
	}

	private Bitmap getBitmap(String path) {

		Uri uri = getImageUri(path);
		InputStream in = null;
		try {
			in = mContentResolver.openInputStream(uri);

			// Decode image size
			BitmapFactory.Options o = new BitmapFactory.Options();
			o.inJustDecodeBounds = true;

			BitmapFactory.decodeStream(in, null, o);
			in.close();

			int scale = 1;
			if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {
				scale = (int) Math.pow(
						2,
						(int) Math.round(Math.log(IMAGE_MAX_SIZE
								/ (double) Math.max(o.outHeight, o.outWidth))
								/ Math.log(0.5)));
			}

			BitmapFactory.Options o2 = new BitmapFactory.Options();
			o2.inSampleSize = scale;
			in = mContentResolver.openInputStream(uri);
			Bitmap b = BitmapFactory.decodeStream(in, null, o2);
			in.close();

			return b;
		} catch (FileNotFoundException e) {
			Log.e(TAG, "file " + path + " not found");
		} catch (IOException e) {
			Log.e(TAG, "file " + path + " not found");
		}
		return null;
	}
}
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// ┃　┳┛　┗┳　┃
// ┃　　　　　　　┃
// ┃　　　┻　　　┃
// ┃　　　　　　　┃
// ┗━┓　　　┏━┛
// ┃　　　┃ 神兽保佑　　　　　　　　
// ┃　　　┃ 代码无BUG。
// ┃　　　┗━━━┓
// ┃　　　　　　　┣┓
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// ┗┓┓┏━┳┓┏┛
// ┃┫┫　┃┫┫
// ┗┻┛　┗┻┛

2) UseCameraActivity.java

本类的功能是调用生成图片拍摄后的路径

照片生成的文件夹在 sd卡的/a/image/camera/.. .jpg

package com.example.camerabaozi;

import java.io.File;
import java.io.IOException;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;

/**
 * 照片生成的文件夹在 sd卡的/a/image/camera/.. .jpg
 * 
 * @author baozi
 * 
 */
public class UseCameraActivity extends Activity {
	private String mImageFilePath;
	public static final String IMAGEFILEPATH = "ImageFilePath";
	public final static String IMAGE_PATH = "image_path";
	static Activity mContext;
	public final static int GET_IMAGE_REQ = 5000;
	private static Context applicationContext;

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

		//推断 activity被销毁后 有没有数据被保存下来
		if (savedInstanceState != null) {

			mImageFilePath = savedInstanceState.getString(IMAGEFILEPATH);

			Log.i("123---savedInstanceState", mImageFilePath);

			File mFile = new File(IMAGEFILEPATH);
			if (mFile.exists()) {
				Intent rsl = new Intent();
				rsl.putExtra(IMAGE_PATH, mImageFilePath);
				setResult(Activity.RESULT_OK, rsl);
				Log.i("123---savedInstanceState", "图片拍摄成功");
				finish();
			} else {
				Log.i("123---savedInstanceState", "图片拍摄失败");
			}
		}

		mContext = this;
		applicationContext = getApplicationContext();
		if (savedInstanceState == null) {
			initialUI();
		}

	}

	public void initialUI() {
		//依据时间生成 后缀为  .jpg 的图片
		long ts = System.currentTimeMillis();
		mImageFilePath = getCameraPath() + ts + ".jpg";
		File out = new File(mImageFilePath);
		showCamera(out);

	}

	private void showCamera(File out) {
		Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
		intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(out)); // set
		startActivityForResult(intent, GET_IMAGE_REQ);
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent intent) {

		if (GET_IMAGE_REQ == requestCode && resultCode == Activity.RESULT_OK) {

			Intent rsl = new Intent();
			rsl.putExtra(IMAGE_PATH, mImageFilePath);
			mContext.setResult(Activity.RESULT_OK, rsl);
			mContext.finish();

		} else {
			mContext.finish();
		}
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putString("ImageFilePath", mImageFilePath + "");

	}

	@Override
	public void onConfigurationChanged(Configuration newConfig) {
		super.onConfigurationChanged(newConfig);
	}

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

	}

	public static String getCameraPath() {
		String filePath = getImageRootPath() + "/camera/";
		File file = new File(filePath);
		if (!file.isDirectory()) {
			file.mkdirs();
		}
		file = null;
		return filePath;
	}

	public static String getImageRootPath() {
		String filePath = getAppRootPath() + "/image";
		File file = new File(filePath);
		if (!file.exists()) {
			file.mkdirs();
		}
		file = null;
		return filePath;
	}

	public static String getAppRootPath() {
		String filePath = "/a";
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			filePath = Environment.getExternalStorageDirectory() + filePath;
		} else {
			filePath = applicationContext.getCacheDir() + filePath;
		}
		File file = new File(filePath);
		if (!file.exists()) {
			file.mkdirs();
		}
		file = null;
		File nomedia = new File(filePath + "/.nomedia");
		if (!nomedia.exists())
			try {
				nomedia.createNewFile();
			} catch (IOException e) {
			}
		return filePath;
	}

}
//┏┓　　　┏┓
//┏┛┻━━━┛┻┓
//┃　　　　　　　┃ 　
//┃　　　━　　　┃
//┃　┳┛　┗┳　┃
//┃　　　　　　　┃
//┃　　　┻　　　┃
//┃　　　　　　　┃
//┗━┓　　　┏━┛
//┃　　　┃   神兽保佑　　　　　　　　
//┃　　　┃   代码无BUG。
//┃　　　┗━━━┓
//┃　　　　　　　┣┓
//┃　　　　　　　┏┛
//┗┓┓┏━┳┓┏┛
//  ┃┫┫　┃┫┫
//  ┗┻┛　┗┻┛

Demo 下载地址:

祝福大家每日精进

谢谢