Android example source code file (CameraTest.java)

This example Android source code file (CameraTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

activityinstrumentationtestcase, android, camera, cameratest, conditionvariable, content, exception, file, fileoutputstream, hardware, jpegpicturecallback, largetest, milliseconds, os, rawpicturecallback, rawpreviewcallback, surfaceholder, test, testshuttercallback, view

The CameraTest.java Android example source code

/*
 * Copyright (C) 2008 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.android.mediaframeworktest.functional;

import com.android.mediaframeworktest.MediaFrameworkTest;
import com.android.mediaframeworktest.MediaNames;

import java.io.*;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.ShutterCallback;
import android.test.ActivityInstrumentationTestCase;
import android.util.Log;
import android.view.SurfaceHolder;

import android.os.ConditionVariable;
import android.os.Looper;

import android.test.suitebuilder.annotation.LargeTest;

/**
 * Junit / Instrumentation test case for the camera api
 
 */  
public class CameraTest extends ActivityInstrumentationTestCase<MediaFrameworkTest> {    
    private String TAG = "CameraTest";
    
    private boolean rawPreviewCallbackResult = false;
    private boolean shutterCallbackResult = false;
    private boolean rawPictureCallbackResult = false;
    private boolean jpegPictureCallbackResult = false;
    
    private static int WAIT_FOR_COMMAND_TO_COMPLETE = 10000;  // Milliseconds.
    
    private RawPreviewCallback mRawPreviewCallback = new RawPreviewCallback();
    private TestShutterCallback mShutterCallback = new TestShutterCallback();
    private RawPictureCallback mRawPictureCallback = new RawPictureCallback();
    private JpegPictureCallback mJpegPictureCallback = new JpegPictureCallback();
    
    private boolean mInitialized = false;
    private Looper mLooper = null;
    private final ConditionVariable mPreviewDone = new ConditionVariable();
    private final ConditionVariable mSnapshotDone = new ConditionVariable();
    
    Camera mCamera;
    Context mContext;
  
    public CameraTest() {
        super("com.android.mediaframeworktest", MediaFrameworkTest.class);
    }

    protected void setUp() throws Exception {
        super.setUp(); 
    }
   
    /*
     * Initializes the message looper so that the Camera object can 
     * receive the callback messages.
     */
    private void initializeMessageLooper() {
        final ConditionVariable startDone = new ConditionVariable();
        Log.v(TAG, "start looper");
        new Thread() {
            @Override
            public void run() {
                // Set up a looper to be used by camera.
                Looper.prepare();
                Log.v(TAG, "start loopRun");
                // Save the looper so that we can terminate this thread 
                // after we are done with it.
                mLooper = Looper.myLooper();
                mCamera = Camera.open();
                startDone.open();
                Looper.loop();  // Blocks forever until Looper.quit() is called.
                Log.v(TAG, "initializeMessageLooper: quit.");
            }
        }.start();

        if (!startDone.block(WAIT_FOR_COMMAND_TO_COMPLETE)) {
            fail("initializeMessageLooper: start timeout");
        }
    }
    
    /*
     * Terminates the message looper thread.
     */
    private void terminateMessageLooper() throws Exception {
        mLooper.quit();
        // Looper.quit() is asynchronous. The looper may still has some
        // preview callbacks in the queue after quit is called. The preview
        // callback still uses the camera object (setHasPreviewCallback).
        // After camera is released, RuntimeException will be thrown from
        // the method. So we need to join the looper thread here.
        mLooper.getThread().join();
        mCamera.release();
    }
    
    //Implement the previewCallback
    private final class RawPreviewCallback implements PreviewCallback { 
        public void onPreviewFrame(byte [] rawData, Camera camera) {         
            Log.v(TAG, "Preview callback start");            
            int rawDataLength = 0;
            if (rawData != null) {
                rawDataLength = rawData.length;
            }
            if (rawDataLength > 0) {
                rawPreviewCallbackResult = true;
            } else {
                rawPreviewCallbackResult = false;
            }
            mPreviewDone.open();
            Log.v(TAG, "Preview callback stop");
        }
    };
    
    //Implement the shutterCallback
    private final class TestShutterCallback implements ShutterCallback {
        public void onShutter() {
            shutterCallbackResult = true;
            Log.v(TAG, "onShutter called");
        }
    };
    
    //Implement the RawPictureCallback
    private final class RawPictureCallback implements PictureCallback { 
        public void onPictureTaken(byte [] rawData, Camera camera) {
            // no support for raw data - success if we get the callback
            rawPictureCallbackResult = true;
            Log.v(TAG, "RawPictureCallback callback");
        }
    };
    
    //Implement the JpegPictureCallback
    private final class JpegPictureCallback implements PictureCallback {   
        public void onPictureTaken(byte [] rawData, Camera camera) {           
            try {         
                if (rawData != null) {
                    int rawDataLength = rawData.length;
                    File rawoutput = new File("/sdcard/test.bmp");
                    FileOutputStream outstream = new FileOutputStream(rawoutput);
                    outstream.write(rawData);                   
                    Log.v(TAG, "JpegPictureCallback rawDataLength = " + rawDataLength);
                    jpegPictureCallbackResult = true;
                } else {
                    jpegPictureCallbackResult = false;
                }
                mSnapshotDone.open();
                Log.v(TAG, "Jpeg Picture callback");
            } catch (Exception e) {
                Log.v(TAG, e.toString());
            }
        }
    };
   
    private void waitForPreviewDone() {
        if (!mPreviewDone.block(WAIT_FOR_COMMAND_TO_COMPLETE)) {
            Log.v(TAG, "waitForPreviewDone: timeout");
        }
        mPreviewDone.close();
    }

    private void waitForSnapshotDone() {
        if (!mSnapshotDone.block(MediaNames.WAIT_SNAPSHOT_TIME)) {
            // timeout could be expected or unexpected. The caller will decide.
            Log.v(TAG, "waitForSnapshotDone: timeout");
        }
        mSnapshotDone.close();
    }


    private void checkTakePicture() { 
        SurfaceHolder mSurfaceHolder;
        try {
            mSurfaceHolder = MediaFrameworkTest.mSurfaceView.getHolder();
            mCamera.setPreviewDisplay(mSurfaceHolder);
            Log.v(TAG, "Start preview");
            mCamera.startPreview();
            waitForPreviewDone();
            mCamera.setPreviewCallback(null);
            mCamera.takePicture(mShutterCallback, mRawPictureCallback, mJpegPictureCallback);
            waitForSnapshotDone();
        } catch (Exception e) {
            Log.v(TAG, e.toString());
        }      
    }
    
    private void checkPreviewCallback() { 
        SurfaceHolder mSurfaceHolder;
        try {
            mSurfaceHolder = MediaFrameworkTest.mSurfaceView.getHolder();
            mCamera.setPreviewDisplay(mSurfaceHolder);
            Log.v(TAG, "start preview");
            mCamera.startPreview();
            waitForPreviewDone();
            mCamera.setPreviewCallback(null);
        } catch (Exception e) {
            Log.v(TAG, e.toString());
        }      
    }
    
    /*
     * TODO(yslau): Need to setup the golden rawData and compare the 
     * the new captured rawData with the golden one.       
     * 
     * Test case 1: Take a picture and verify all the callback
     * functions are called properly.
     */
    @LargeTest
    public void testTakePicture() throws Exception {  
        initializeMessageLooper();
        mCamera.setPreviewCallback(mRawPreviewCallback);
        checkTakePicture();
        terminateMessageLooper();
        assertTrue("shutterCallbackResult", shutterCallbackResult);
        assertTrue("rawPictureCallbackResult", rawPictureCallbackResult);
        assertTrue("jpegPictureCallbackResult", jpegPictureCallbackResult);
    }
    
    /*
     * Test case 2: Set the preview and 
     * verify the RawPreviewCallback is called
     */
    @LargeTest
    public void testCheckPreview() throws Exception {  
        initializeMessageLooper();
        mCamera.setPreviewCallback(mRawPreviewCallback);
        checkPreviewCallback();     
        terminateMessageLooper();
        assertTrue("RawPreviewCallbackResult", rawPreviewCallbackResult);
    }

}