android如何实现简单拍照功能
这篇文章主要介绍android如何实现简单拍照功能，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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拍照可以调用系统的相机进行拍照，拍完保存到相应的SD卡目录。最近要用到拍照这个功能，首先试了下调用相机拍照，保存到相应目录，然后用imageview显示的时候感觉，很模糊。可能是图片被压缩的太狠了。所以自己使用Camera写了一个拍照的功能，拍出来的还挺清晰的，不过文件有点大一张图片差不多1.7M。如果想拍高清图可以使用下面的代码。
代码很简单，我就不做过多解释了。
package com.example.testsimple;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private Camera camera;
private File picture;
private Button btnSave;
private final static String TAG = "CameraActivity";
private ImageView open_picIcon;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Intent intent=new Intent(MainActivity.this,MyCameraActivity.class);
startActivity(intent);
finish();*/
setupViews();
}
private void setupViews(){
surfaceView = (SurfaceView) findViewById(R.id.camera_preview); // Camera interface to instantiate components
surfaceHolder = surfaceView.getHolder(); // Camera interface to instantiate components
surfaceHolder.addCallback(surfaceCallback); // Add a callback for the SurfaceHolder
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btnSave = (Button) findViewById(R.id.save_pic);
open_picIcon=(ImageView) findViewById(R.id.open_picIcon);
btnSave.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
surfaceView.setVisibility(View.VISIBLE);
open_picIcon.setVisibility(View.GONE);
takePic();
}
});
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_CAMERA
|| keyCode == KeyEvent.KEYCODE_SEARCH) {
takePic();
return true;
}
return super.onKeyDown(keyCode, event);
}
private void takePic() {
camera.stopPreview();// stop the preview
camera.takePicture(null, null, pictureCallback); // picture
}
// Photo call back
Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {
//@Override
public void onPictureTaken(byte[] data, Camera camera) {
new SavePictureTask().execute(data);
camera.startPreview();
}
};
// save pic
class SavePictureTask extends AsyncTask {
@Override
protected String doInBackground(byte[]... params) {
String fname = DateFormat.format("yyyyMMddhhmmss", new Date()).toString()+".jpg";
Log.i(TAG, "fname="+fname+";dir="+Environment.getExternalStorageDirectory());
//picture = new File(Environment.getExternalStorageDirectory(),fname);// create file
picture = new File(Environment.getExternalStorageDirectory()+"/images/"+fname);
File file= picture.getParentFile();
if(!file.exists())
file.mkdir();
try {
FileOutputStream fos = new FileOutputStream(picture.getPath()); // Get file output stream
fos.write(params[0]); // Written to the file
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Bitmap bitmap=getDiskBitmap(picture.getPath());
surfaceView.setVisibility(View.GONE);
open_picIcon.setVisibility(View.VISIBLE);
open_picIcon.setImageBitmap(bitmap);
}
}
private Bitmap getDiskBitmap(String pathString)
{
Bitmap bitmap = null;
try
{
File file = new File(pathString);
if(file.exists())
{
bitmap = BitmapFactory.decodeFile(pathString);
}
} catch (Exception e)
{
// TODO: handle exception
}
return bitmap;
}
// SurfaceHodler Callback handle to open the camera, off camera and photo size changes
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
Log.i(TAG, "surfaceCallback====");
camera = Camera.open(); // Turn on the camera
try {
camera.setPreviewDisplay(holder); // Set Preview
} catch (IOException e) {
camera.release();// release camera
camera = null;
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Log.i(TAG,"====surfaceChanged");
Camera.Parameters parameters = camera.getParameters(); // Camera parameters to obtain
parameters.setPictureFormat(PixelFormat.JPEG);// Setting Picture Format
// parameters.set("rotation", 180); // Arbitrary rotation
camera.setDisplayOrientation(0);
parameters.setPreviewSize(400, 300); // Set Photo Size
camera.setParameters(parameters); // Setting camera parameters
camera.startPreview(); // Start Preview
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i(TAG,"====surfaceDestroyed");
camera.stopPreview();// stop preview
camera.release(); // Release camera resources
camera = null;
}
};
} 拍完以后自动保存到SD卡中的images目录下
下面是图片存放路径
1.8M 确实有点大，不过是高清图片
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