Android 拍照强制横屏解决...

Android Camera 三星BUG :

最近在Android项目中使用拍照功能 , 其它型号(华为，小米，中兴，魅族...)的手机运行成功了 唯独在三星的相机上遇到了bug .

BUG具体体现为 :

(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重启生命周期 (但是部分机型 配置 android:configChanges 也不能阻止横竖屏切换);

我的解决方法为

如果 activity 的销毁如果无法避免 那么在activity销毁之前调用 onSaveInstanceState 保存图片的路径

当activity重新创建的时候 会将 onSaveInstanceState 保存的文件传递给onCreate()当中

在onCreate当中 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 终于通过了测试同学们的验证.....

我的代码如下:

配置 Androidmanifest.xml 中的配置 activity

[java] view
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<activity

android:name=".UseCameraActivity"

android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|navigation"

android:launchMode="singleTop"

android:screenOrientation="portrait" />

增加权限:

[java] view
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<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: 根据指定的路径 生成bitmap ; 显示图片

[java] view
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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

*

* 照片生成的目录在 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);

// 根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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2) UseCameraActivity.java

本类的功能是调用 生成图片拍摄后的路径

照片生成的目录在 sd卡的/a/image/camera/.. .jpg

[java] view
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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;

/**

* 照片生成的目录在 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);

//判断 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() {

//根据时间生成 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;

}

}

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