对Activity强制横屏，保证预览方向正确。
使用OrientationEventListener监听设备方向。推断竖拍时，旋转照片后再保存。保证竖拍时预览图片和保存后的图片方向一致。
执行效果：
代码：
TestCameraActivity.java
package com.example.testcamera;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.UUID;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.OrientationEventListener;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class TestCameraActivity extends Activity implements OnClickListener,
SurfaceHolder.Callback {
private static final String TAG = "TestCameraActivity";
public static final String KEY_FILENAME = "filename";
private Button mTakePhoto;
private SurfaceView mSurfaceView;
private Camera mCamera;
private String mFileName;
private OrientationEventListener mOrEventListener; // 设备方向监听器
private Boolean mCurrentOrientation; // 当前设备方向 横屏false,竖屏true
/* 图像数据处理还未完毕时的回调函数 */
private Camera.ShutterCallback mShutter = new Camera.ShutterCallback() {
@Override
public void onShutter() {
// 一般显示运行进度条
}
};
/* 图像数据处理完毕后的回调函数 */
private Camera.PictureCallback mJpeg = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// 保存图片
mFileName = UUID.randomUUID().toString() + ".jpg";
Log.i(TAG, mFileName);
FileOutputStream out = null;
try {
out = openFileOutput(mFileName, Context.MODE_PRIVATE);
byte[] newData = null;
if (mCurrentOrientation) {
// 竖屏时。旋转图片再保存
Bitmap oldBitmap = BitmapFactory.decodeByteArray(data, 0,
data.length);
Matrix matrix = new Matrix();
matrix.setRotate(90);
Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0,
oldBitmap.getWidth(), oldBitmap.getHeight(),
matrix, true);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
newBitmap.compress(Bitmap.CompressFormat.JPEG, 85, baos);
newData = baos.toByteArray();
out.write(newData);
} else {
out.write(data);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (out != null)
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
Intent i = new Intent(TestCameraActivity.this, ShowPicture.class);
i.putExtra(KEY_FILENAME, mFileName);
startActivity(i);
finish();
}
};
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_camera);
mTakePhoto = (Button) findViewById(R.id.take_photo);
mTakePhoto.setOnClickListener(this); // 拍照button监听器
startOrientationChangeListener(); // 启动设备方向监听器
mSurfaceView = (SurfaceView) findViewById(R.id.my_surfaceView);
SurfaceHolder holder = mSurfaceView.getHolder();
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
holder.addCallback(this); // 回调接口
}
private final void startOrientationChangeListener() {
mOrEventListener = new OrientationEventListener(this) {
@Override
public void onOrientationChanged(int rotation) {
if (((rotation >= 0) && (rotation <= 45)) || (rotation >= 315)
|| ((rotation >= 135) && (rotation <= 225))) {// portrait
mCurrentOrientation = true;
Log.i(TAG, "竖屏");
} else if (((rotation > 45) && (rotation < 135))
|| ((rotation > 225) && (rotation < 315))) {// landscape
mCurrentOrientation = false;
Log.i(TAG, "横屏");
}
}
};
mOrEventListener.enable();
}
@Override
public void onClick(View v) {
// 点击拍照
switch (v.getId()) {
case R.id.take_photo:
mCamera.takePicture(mShutter, null, mJpeg);
break;
default:
break;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// SurfaceView尺寸发生改变时（首次在屏幕上显示相同会调用此方法）。初始化mCamera參数，启动Camera预览
Parameters parameters = mCamera.getParameters();// 获取mCamera的參数对象
Size largestSize = getBestSupportedSize(parameters
.getSupportedPreviewSizes());
parameters.setPreviewSize(largestSize.width, largestSize.height);// 设置预览图片尺寸
largestSize = getBestSupportedSize(parameters
.getSupportedPictureSizes());// 设置捕捉图片尺寸
parameters.setPictureSize(largestSize.width, largestSize.height);
mCamera.setParameters(parameters);
try {
mCamera.startPreview();
} catch (Exception e) {
if (mCamera != null) {
mCamera.release();
mCamera = null;
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// SurfaceView创建时，建立Camera和SurfaceView的联系
if (mCamera != null) {
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// SurfaceView销毁时。取消Camera预览
if (mCamera != null) {
mCamera.stopPreview();
}
}
@SuppressLint("NewApi")
@Override
public void onResume() {
super.onResume();
// 开启相机
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
mCamera = Camera.open(0);
// i=0 表示后置相机
} else
mCamera = Camera.open();
}
@Override
public void onPause() {
super.onPause();
// 释放相机
if (mCamera != null) {
mCamera.release();
mCamera = null;
}
}
private Size getBestSupportedSize(List<Size> sizes) {
// 取能适用的最大的SIZE
Size largestSize = sizes.get(0);
int largestArea = sizes.get(0).height * sizes.get(0).width;
for (Size s : sizes) {
int area = s.width * s.height;
if (area > largestArea) {
largestArea = area;
largestSize = s;
}
}
return largestSize;
}
}
ShowPicture.java
package com.example.testcamera;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.widget.ImageView;
public class ShowPicture extends Activity {
private static final String TAG = "ShowPicture";
private ImageView mPicture;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_picture);
mPicture = (ImageView) findViewById(R.id.picture);
String fileName = getIntent().getStringExtra(
TestCameraActivity.KEY_FILENAME);
// 图片路径
Log.i(TAG, fileName);
String path = getFileStreamPath(fileName).getAbsolutePath();
Display display = getWindowManager().getDefaultDisplay(); // 显示屏尺寸
float destWidth = display.getWidth();
float destHeight = display.getHeight();
// 读取本地图片尺寸
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);// 设置为true，options依旧相应此图片，但解码器不会为此图片分配内存
float srcWidth = options.outWidth;
float srcHeight = options.outHeight;
int inSampleSize = 1;
if (srcHeight > destHeight || srcWidth > destWidth) { // 当图片长宽大于屏幕长宽时
if (srcWidth > srcHeight) {
inSampleSize = Math.round(srcHeight / destHeight);
} else {
inSampleSize = Math.round(srcWidth / destWidth);
}
}
options = new BitmapFactory.Options();
options.inSampleSize = inSampleSize;
Bitmap bitmap = BitmapFactory.decodeFile(path, options);
BitmapDrawable bDrawable = new BitmapDrawable(getResources(), bitmap);
mPicture.setImageDrawable(bDrawable);
}
@Override
public void onDestroy() {
if (!(mPicture.getDrawable() instanceof BitmapDrawable))
return;
// 释放bitmap占用的空间
BitmapDrawable b = (BitmapDrawable) mPicture.getDrawable();
b.getBitmap().recycle();
mPicture.setImageDrawable(null);
}
}
github:https://github.com/mandmLeee/CustomCameraDemo