/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.graphics;import android.app.Activity;import android.content.Context;import android.hardware.Camera;import android.os.Bundle;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.Window;// ----------------------------------------------------------------------public class CameraPreview extends Activity {        private Preview mPreview;        @Override	protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                // Hide the window title.        requestWindowFeature(Window.FEATURE_NO_TITLE);            // Create our Preview view and set it as the content of our activity.        mPreview = new Preview(this);        setContentView(mPreview);    }}// ----------------------------------------------------------------------class Preview extends SurfaceView implements SurfaceHolder.Callback {    SurfaceHolder mHolder;    Camera mCamera;        Preview(Context context) {        super(context);                // Install a SurfaceHolder.Callback so we get notified when the        // underlying surface is created and destroyed.        mHolder = getHolder();        mHolder.addCallback(this);        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    }    public void surfaceCreated(SurfaceHolder holder) {        // The Surface has been created, acquire the camera and tell it where        // to draw.        mCamera = Camera.open();        mCamera.setPreviewDisplay(holder);    }    public void surfaceDestroyed(SurfaceHolder holder) {        // Surface will be destroyed when we return, so stop the preview.        // Because the CameraDevice object is not a shared resource, it's very        // important to release it when the activity is paused.        mCamera.stopPreview();        mCamera = null;    }    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {        // Now that the size is known, set up the camera parameters and begin        // the preview.        Camera.Parameters parameters = mCamera.getParameters();        parameters.setPreviewSize(w, h);        mCamera.setParameters(parameters);        mCamera.startPreview();    }}