Android相机教程（使用surfaceview）
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Camera Tutorial for Android (using surfaceview)
提问by jjLin
Here is my example code:
这是我的示例代码：
package newslab.video.server;
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class VideoServer extends Activity implements SurfaceHolder.Callback {
TextView testView;
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
private final String tag = "VideoServer";
Button start, stop;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
start = (Button)findViewById(R.id.btn_start);
start.setOnClickListener(new Button.OnClickListener() {
public void onClick(View arg0) {
start_camera();
}
});
stop = (Button)findViewById(R.id.btn_stop);
stop.setOnClickListener(new Button.OnClickListener() {
public void onClick(View arg0) {
stop_camera();
}
});
surfaceView = (SurfaceView)findViewById(R.id.surfaceView1);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
private void start_camera() {
try{
camera = Camera.open();
}catch(RuntimeException e){
Log.e(tag, "init_camera: " + e);
return;
}
Camera.Parameters param;
param = camera.getParameters();
//modify parameter
param.setPreviewFrameRate(20);
param.setPreviewSize(176, 144);
camera.setParameters(param);
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
} catch (Exception e) {
Log.e(tag, "init_camera: " + e);
return;
}
}
private void stop_camera() {
camera.stopPreview();
camera.release();
}
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
However, it just shows the preview and stop the camera.
Is there any other tutorial to teach further processing such as how to save the image or process the image with bitmap?
但是，它只显示预览并停止相机。
是否有其他教程可以教授进一步处理，例如如何保存图像或使用位图处理图像？
回答by Narendra Pal
Ok. So here is the solution:
好的。所以这里是解决方案：
I am not adding any try catch. This is simply for the capturing the image and storing it into the sdcard.
我没有添加任何尝试捕获。这只是为了捕获图像并将其存储到 SD 卡中。
public class VideoServer extends Activity implements SurfaceHolder.Callback {
TextView testView;
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
PictureCallback rawCallback;
ShutterCallback shutterCallback;
PictureCallback jpegCallback;
private final String tag = "VideoServer";
Button start, stop, capture;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
start = (Button)findViewById(R.id.btn_start);
start.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View arg0) {
start_camera();
}
});
stop = (Button)findViewById(R.id.btn_stop);
capture = (Button) findViewById(R.id.capture);
stop.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View arg0) {
stop_camera();
}
});
capture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
captureImage();
}
});
surfaceView = (SurfaceView)findViewById(R.id.surfaceView1);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.d("Log", "onPictureTaken - raw");
}
};
/** Handles data for jpeg picture */
shutterCallback = new ShutterCallback() {
public void onShutter() {
Log.i("Log", "onShutter'd");
}
};
jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(String.format(
"/sdcard/%d.jpg", System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d("Log", "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d("Log", "onPictureTaken - jpeg");
}
};
}
private void captureImage() {
// TODO Auto-generated method stub
camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
private void start_camera()
{
try{
camera = Camera.open();
}catch(RuntimeException e){
Log.e(tag, "init_camera: " + e);
return;
}
Camera.Parameters param;
param = camera.getParameters();
//modify parameter
param.setPreviewFrameRate(20);
param.setPreviewSize(176, 144);
camera.setParameters(param);
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
//camera.takePicture(shutter, raw, jpeg)
} catch (Exception e) {
Log.e(tag, "init_camera: " + e);
return;
}
}
private void stop_camera()
{
camera.stopPreview();
camera.release();
}
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
Don't press caputurebutton before the start,because I didn't checked it. I just wanted to show you that how to capture and store image into the sdcard.
开始前不要按捕获按钮，因为我没有检查它。我只是想向您展示如何捕获图像并将其存储到sdcard 中。
回答by Sahil Mahajan Mj
Dont forget to take the permission for using camera in Android Manifest file,
不要忘记在Android Manifest文件中获得使用相机的权限，
<uses-permission android:name="android.permission.CAMERA" ></uses-permission>
Also you have to take permission for storing images on SD Card,
您还必须获得在 SD 卡上存储图像的许可，
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
回答by Kunal Dharaiya
Camera permission in manifiestfile:
manifiest文件中的相机权限：
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA" />
Permission for storing image from sdcardin manifiestfile:
权限从存储图像sdcard的manifiest文件：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
回答by ViksaaSkool
I was having issues with camera, figuring out how to implement and work with and came across this resources: Camera preview. At the bottom of the page you have examples of the most common scenarios as well as the one in your original question: Take and preview Photo
我在使用相机时遇到问题，想知道如何实施和使用这些资源：相机预览。在页面底部，您有最常见场景的示例以及原始问题中的示例： 拍摄和预览照片
