Android 如何在不剪切图像长度和宽度的情况下捕获图像,如“摄影机预览”中所示
我正在制作一个android定制相机应用程序。在它里面,我想从前面的摄像头中拍摄一张照片,保存下来并展示给用户。但我在这里面临一些问题。一些设备工作得非常完美,但另一些设备工作得不好,事实上,它们从顶部开始切割图像的长度。我又问了一个问题,但没有找到好答案 我正在努力解决三个问题,即相机的最佳资源配置、屏幕大小(宽度和高度)以及相机拍摄的位图的宽度和高度。我的应用程序在其他设备上运行良好,但在Lg set上运行不好,因为它的分辨率太高 我得到的前摄像头的最佳分辨率为1776*1080,其中屏幕尺寸为1440*2392,但摄像头拍摄的照片的宽度和高度为1280*960。现在问题仍然存在。我不知道如何获得与相机预览相同的图像,我不希望它的任何一个角被切掉。那么如何做到这一点。以下是我的代码,用于获得最佳的相机suizeAndroid 如何在不剪切图像长度和宽度的情况下捕获图像,如“摄影机预览”中所示,android,camera,android-camera,Android,Camera,Android Camera,我正在制作一个android定制相机应用程序。在它里面,我想从前面的摄像头中拍摄一张照片,保存下来并展示给用户。但我在这里面临一些问题。一些设备工作得非常完美,但另一些设备工作得不好,事实上,它们从顶部开始切割图像的长度。我又问了一个问题,但没有找到好答案 我正在努力解决三个问题,即相机的最佳资源配置、屏幕大小(宽度和高度)以及相机拍摄的位图的宽度和高度。我的应用程序在其他设备上运行良好,但在Lg set上运行不好,因为它的分辨率太高 我得到的前摄像头的最佳分辨率为1776*1080,其中屏幕尺
public static Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio=(double)h / w;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
下面是我设置参数的方式:
Camera.Size previewSize = getOptimalPreviewSize(previewSizes,screenWidth,screenHeight);
parameters.setPreviewSize(previewSize.width,previewSize.height);
parameters.setZoom(Camera.Parameters.FOCUS_DISTANCE_OPTIMAL_INDEX);
camera.setParameters(parameters);
**
那么,我怎样才能得到相机预览所显示的完整画面呢?请帮帮我
**CameraView.class
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore.Images;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
public class CameraView extends Activity implements SurfaceHolder.Callback,OnClickListener {
OutputStream output;
File dir;
private static final String TAG="CameraTest";
Camera camera;
boolean mPreviewRunning=false;
public void onCreate(Bundle icicle){
super.onCreate(icicle);
Log.e(TAG,"onCreate");
File filepath=Environment.getExternalStorageDirectory();
dir=new File(filepath.getAbsolutePath()+"/Cam/");
dir.mkdirs();
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.cameraview);
mSurfaceView=(SurfaceView)findViewById(R.id.surface_camera);
//mSurfaceView.setOnClickListener(this);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
camera.takePicture(null,mPictureCallback,mPictureCallback);
}
},6000);
mSurfaceHolder=mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
}
Camera.PictureCallback mPictureCallback=new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
if(data!=null)
{
camera.stopPreview();
mPreviewRunning=false;
camera.release();
try
{
BitmapFactory.Options opts=new BitmapFactory.Options();
Bitmap bitmap=BitmapFactory.decodeByteArray(data,0,data.length,opts);
bitmap=Bitmap.createScaledBitmap(bitmap,480,480,false);
File file=new File(dir,"raj.jpg");
try
{
output=new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, output);
output.flush();
output.close();
String url=Images.Media.insertImage(getContentResolver(),bitmap, "raj.jpg",null);
}
catch(Exception e)
{
}
ImgCap.image.setImageBitmap(bitmap);
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
setResult(585);
finish(); }
}
};
protected void onResume()
{
Log.e(TAG,"onResume");
super.onResume();
}
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
Log.e(TAG,"surfaceChanged");
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.GINGERBREAD)
{
Camera.CameraInfo info=new Camera.CameraInfo();
for(int i=0;i<Camera.getNumberOfCameras();i++)
{
Camera.getCameraInfo(i,info);
if(info.facing==Camera.CameraInfo.CAMERA_FACING_FRONT)
{
camera=Camera.open(i);
}
}
}
if(camera==null)
{
camera=Camera.open();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if(mPreviewRunning)
{
camera.stopPreview();
}
Camera.Parameters p=camera.getParameters();
p.setPreviewSize(width, height);
camera.setParameters(p);
try
{
camera.setPreviewDisplay(holder);
}
catch(Exception e)
{
e.printStackTrace();
}
camera.startPreview();
mPreviewRunning=true;
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
Log.e(TAG,"surfaceDestroyed");
}
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
}
cameraview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<SurfaceView android:id="@+id/surface_camera"
android:layout_width="fill_parent"
android:layout_height="10dip"
android:layout_weight="1"
/>
</LinearLayout>
如果要获得与相机预览相同的图像,需要为相机设置setPictureSize()
。首先,循环使用getSupportedPictureSizes()
,然后找到与预览大小最接近的大小(具有相同的纵横比)。您有解决方案吗?这里也有同样的问题。@DuyPham你能用一些代码解释一下吗?
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class ImgCap extends Activity {
public static ImageView image;
private Button btn_camera;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
image = (ImageView) findViewById(R.id.image);
btn_camera = (Button) findViewById(R.id.btn_camera);
btn_camera.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(ImgCap.this, CameraView.class);
startActivityForResult(i, 999);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (requestCode == 999) {
if (resultCode == 585) {
} else {
alert("Picture not Captured");
}
}
}
private void alert(String string) {
// TODO Auto-generated method stub
AlertDialog.Builder alert = new AlertDialog.Builder(ImgCap.this);
alert.setMessage(string);
alert.setTitle("Alert");
alert.setNeutralButton("OK", null);
alert.show();
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<SurfaceView android:id="@+id/surface_camera"
android:layout_width="fill_parent"
android:layout_height="10dip"
android:layout_weight="1"
/>
</LinearLayout>