我用这段代码从相机中捕捉图像。
package android.takeowneship;
import java.io.File;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.ImageView;
import android.widget.Toast;
public class camera extends Activity{
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
Uri imageUri;
private ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//define the file-name to save photo taken by Camera activity
String fileName = "new-photo-name.jpg";
//create parameters for Intent with filename
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, fileName);
values.put(MediaStore.Images.Media.DESCRIPTION,"Image capture by camera");
//imageUri is the current activity attribute, define and save it for later usage (also in onSaveInstanceState)
imageUri = getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
//create new Intent
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
//use imageUri here to access the image
Toast.makeText(this, "picture has been taken"+ imageUri, Toast.LENGTH_SHORT).show();
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(this, "Picture was not taken", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Picture was not taken", Toast.LENGTH_SHORT).show();
}
}
}
public static File convertImageUriToFile (Uri imageUri, Activity activity) {
Cursor cursor = null;
try {
String [] proj={MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID, MediaStore.Images.ImageColumns.ORIENTATION};
cursor = activity.managedQuery( imageUri,
proj, // Which columns to return
null, // WHERE clause; which rows to return (all rows)
null, // WHERE clause selection arguments (none)
null); // Order-by clause (ascending by name)
int file_ColumnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
// int orientation_ColumnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns.ORIENTATION);
if (cursor.moveToFirst()) {
// String orientation = cursor.getString(orientation_ColumnIndex);
return new File(cursor.getString(file_ColumnIndex));
}
return null;
} finally {
if (cursor != null) {
cursor.close();
}
}
}
}
但在此代码中，它会打开相机，用户必须单击按钮才能拍照。 我想要的是自动拍摄照片（无需预览）并将其保存在存储卡中。
答案 0 :(得分：4)
此代码使用前置摄像头捕获图像并自动保存
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
int index = getFrontCameraId();
if (index == -1){
Toast.makeText(getApplicationContext(), "No front camera", Toast.LENGTH_LONG).show();
}
else
{
iv_image = (ImageView) findViewById(R.id.imageView);
sv = (SurfaceView) findViewById(R.id.surfaceView);
sHolder = sv.getHolder();
sHolder.addCallback(this);
sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
{
parameters = mCamera.getParameters();
mCamera.setParameters(parameters);
mCamera.startPreview();
Camera.PictureCallback mCall = new Camera.PictureCallback()
{
@Override
public void onPictureTaken(byte[] data, Camera camera)
{
Uri uriTarget = getContentResolver().insert//(Media.EXTERNAL_CONTENT_URI, image);
(Media.EXTERNAL_CONTENT_URI, new ContentValues());
OutputStream imageFileOS;
try {
imageFileOS = getContentResolver().openOutputStream(uriTarget);
imageFileOS.write(data);
imageFileOS.flush();
imageFileOS.close();
Toast.makeText(TakePictureActivity.this,
"Image saved: " + uriTarget.toString(), Toast.LENGTH_LONG).show();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
//mCamera.startPreview();
bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
iv_image.setImageBitmap(bmp);
}
};
mCamera.takePicture(null, null, mCall);
}
int getFrontCameraId() {
CameraInfo ci = new CameraInfo();
for (int i = 0 ; i < Camera.getNumberOfCameras(); i++) {
Camera.getCameraInfo(i, ci);
if (ci.facing == CameraInfo.CAMERA_FACING_FRONT) return i;
}
return -1; // No front-facing camera found
}
@Override
public void surfaceCreated(SurfaceHolder holder)
{
int index = getFrontCameraId();
if (index == -1){
Toast.makeText(getApplicationContext(), "No front camera", Toast.LENGTH_LONG).show();
}
else
{
mCamera = Camera.open(index);
Toast.makeText(getApplicationContext(), "With front camera", Toast.LENGTH_LONG).show();
}
mCamera = Camera.open(index);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException exception) {
mCamera.release();
mCamera = null;
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
答案 1 :(得分：1)
Capturing Image without user interaction(without user action) and capture an image in background using android service
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.app.Service;
import android.content.Intent;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.os.Environment;
import android.os.IBinder;
import android.os.StrictMode;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class CapPhoto extends Service
{
private SurfaceHolder sHolder;
private Camera mCamera;
private Parameters parameters;
@Override
public void onCreate()
{
super.onCreate();
Log.d("CAM", "start");
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy =
new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);};
Thread myThread = null;
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
if (Camera.getNumberOfCameras() >= 2) {
mCamera = Camera.open(CameraInfo.CAMERA_FACING_FRONT); }
if (Camera.getNumberOfCameras() < 2) {
mCamera = Camera.open(); }
SurfaceView sv = new SurfaceView(getApplicationContext());
try {
mCamera.setPreviewDisplay(sv.getHolder());
parameters = mCamera.getParameters();
mCamera.setParameters(parameters);
mCamera.startPreview();
mCamera.takePicture(null, null, mCall);
} catch (IOException e) { e.printStackTrace(); }
sHolder = sv.getHolder();
sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
Camera.PictureCallback mCall = new Camera.PictureCallback()
{
public void onPictureTaken(final byte[] data, Camera camera)
{
FileOutputStream outStream = null;
try{
File sd = new File(Environment.getExternalStorageDirectory(), "A");
if(!sd.exists()) {
sd.mkdirs();
Log.i("FO", "folder" + Environment.getExternalStorageDirectory());
}
Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
String tar = (sdf.format(cal.getTime()));
outStream = new FileOutputStream(sd+tar+".jpg");
outStream.write(data); outStream.close();
Log.i("CAM", data.length + " byte written to:"+sd+tar+".jpg");
camkapa(sHolder);
} catch (FileNotFoundException e){
Log.d("CAM", e.getMessage());
} catch (IOException e){
Log.d("CAM", e.getMessage());
}}
};
@Override
public IBinder onBind(Intent intent) {
return null;
}
public void camkapa(SurfaceHolder sHolder) {
if (null == mCamera)
return;
mCamera.stopPreview();
mCamera.release();
mCamera = null;
Log.i("CAM", " closed");
}
}
Step:2 Activity File - name is :Second.java
import java.util.Calendar;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
public class Second extends Activity {
Intent service;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Calendar cal = Calendar.getInstance();
service = new Intent(getBaseContext(), CapPhoto.class);
cal.add(Calendar.SECOND, 15);
//TAKE PHOTO EVERY 15 SECONDS
PendingIntent pintent = PendingIntent.getService(this, 0, service, 0);
AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
60*60*1000, pintent);
startService(service);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second, menu);
return true;
}
}
step 3: Android manife
st file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.dbsource.dbinsert"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.BROADCAST_STICKY" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.BROADCAST_STICKY" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-feature android:name="android.hardware.camera" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".Second"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".CapPhoto" android:enabled="true">
<intent-filter>
</intent-filter>
</service>
</application>
</manifest>
refer this link [enter link description here][1]
[1]: http://chandandroid.blogspot.in/2014/04/capturing-image-without-user-action.html
答案 2 :(得分：1)
说明
我想在不带确认按钮的情况下在Android上拍照。
解决方案
使用“ android.intent.extra.quickCapture”
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra("android.intent.extra.quickCapture",true);