android拍照
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。
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package com.example.test易做图;
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.Su易做图ceHolder;
import android.view.Su易做图ceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
private Su易做图ceView su易做图ceView;
private Su易做图ceHolder su易做图ceHolder;
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(){
su易做图ceView = (Su易做图ceView) findViewById(R.id.camera_preview); // Camera inte易做图ce to instantiate components
su易做图ceHolder = su易做图ceView.getHolder(); // Camera inte易做图ce to instantiate components
su易做图ceHolder.addCallback(su易做图ceCallback); // Add a callback for the Su易做图ceHolder
su易做图ceHolder.setType(Su易做图ceHolder.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) {
su易做图ceView.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<byte[], String, String> {
@Override
protected String doInBackground(byte[]... params) {
String fname = DateFormat.format("yyyyMMddhhmmss", new Date()).toString()+".jpg";
Log.i(TAG, "fname="+fname+";dir="+Environment.getExternalStorageDirectory());
