实例介绍
【实例简介】andriod 4.4 打开直接报错。。。，大家看下思路就好
【实例截图】
【实例截图】
【核心代码】
package com.camera.demo;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.List;
import com.camera.demo.activity.ExposureAcitivity;
import com.camera.demo.utils.Constants;
import com.camera.demo.utils.FileUtil;
import com.camera.demo.utils.SettingToast;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
/**
* @Title:
* @Description:
* @Author:辉清
* @Since:2014年4月30日
* @Version:1.1.0
*/
/**
* @Title:
* @Description:
* @Author:辉清
* @Since:2014年4月30日
* @Version:1.1.0
*/
public class CameraDemoActivity extends Activity implements OnClickListener {
private final static String TAG = "CameraActivity";
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
private Camera.Parameters mParameters;
private File mPictureFile;
private Button mBtnSave;
private TextView mExposureTv;
private int mExposureNum = 0;
private SharedPreferences mSharedPreferences;
private Editor mEditor;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
initViews();
initDatas();
}
@Override
protected void onStart() {
super.onStart();
}
private void initViews() {
mSurfaceView = (SurfaceView) findViewById(R.id.camera_preview); // components
mSurfaceHolder = mSurfaceView.getHolder();
mBtnSave = (Button) findViewById(R.id.save_pic);
mBtnSave.setOnClickListener(this);
mExposureTv = (TextView) findViewById(R.id.exposure);
mSharedPreferences = getSharedPreferences(Constants.EXPOSURE,
MODE_WORLD_WRITEABLE);
mEditor = mSharedPreferences.edit();
}
private void initDatas() {
mSurfaceHolder.addCallback(surfaceCallback);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mExposureTv.setOnClickListener(this);
mExposureNum = mSharedPreferences.getInt(Constants.EXPOSURE_NUM, 0);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case Constants.EXPOSURE_REQUEST_CODE:
if (resultCode == Constants.EXPOSURE_RESULT_CODE) {
if (data != null) {
mExposureNum = data.getExtras().getInt(
Constants.EXPOSURE_NUM);
mEditor.putInt(Constants.EXPOSURE_NUM, mExposureNum);
mEditor.commit();
}
}
default:
break;
}
}
@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);
}
// 图片回调
Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {
// @Override
public void onPictureTaken(byte[] data, Camera camera) {
new SavePictureTask().execute(data);
camera.startPreview();
}
};
// 保存图片
class SavePictureTask extends AsyncTask<byte[], String, String> {
@Override
protected String doInBackground(byte[]... params) {
String sdStatus = Environment.getExternalStorageState();
if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
Message message = mHandler.obtainMessage();
message.what = Constants.IS_HAVE_SDCARD;
message.obj = getString(R.string.have_sdcard);
mHandler.sendMessage(message);
return null;
}
mPictureFile = FileUtil.getOutputMediaFile();
try {
FileOutputStream fos = new FileOutputStream(
mPictureFile.getPath()); // Get
// stream
fos.write(params[0]); // Written to the file
Message message = mHandler.obtainMessage();
message.what = Constants.UPDATA_TOAST_MSG;
message.obj = getString(R.string.photo_save_path);
mHandler.sendMessage(message);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
Log.v(TAG, "surfaceCallback====");
mCamera = Camera.open(); // Turn on the camera
try {
mCamera.setPreviewDisplay(holder); // Set Preview
} catch (IOException e) {
mCamera.release();// release camera
mCamera = null;
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Log.v(TAG, "====surfaceChanged");
mParameters = mCamera.getParameters();
if (mExposureNum == 0) {
mExposureNum = mParameters.getExposureCompensation();
}
mExposureTv.setText("当前曝光度为：" mExposureNum " " "点击可选择");
mParameters.setExposureCompensation(mExposureNum);
if (Integer.parseInt(Build.VERSION.SDK) >= 8)
setDisplayOrientation(mCamera, 90);
else {
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
mParameters.set("orientation", "portrait");
mParameters.set("rotation", 90);
}
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
mParameters.set("orientation", "landscape");
mParameters.set("rotation", 90);
}
}
mParameters.setPictureFormat(PixelFormat.JPEG);
List<Size> sizes = mParameters.getSupportedPreviewSizes();
Size optimalSize = getOptimalPreviewSize(sizes, width, height);
mParameters.setPictureSize(optimalSize.width, optimalSize.height);
mCamera.setParameters(mParameters);
mCamera.startPreview();
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.v(TAG, "====surfaceDestroyed");
mCamera.stopPreview();// stop preview
mCamera.release(); // Release camera resources
mCamera = null;
}
};
/**
* @param sizes
* @param w
* @param h
* @return
* @Description:
*/
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.2;
double targetRatio = (double) w / h;
if (sizes == null)
return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes) {
Log.v(TAG, "Checking size " size.width "w " size.height "h");
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the
// requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
/**
* @param camera
* @param angle
* @Description:
*/
protected void setDisplayOrientation(Camera camera, int angle) {
Method downPolymorphic;
try {
downPolymorphic = camera.getClass().getMethod(
"setDisplayOrientation", new Class[] { int.class });
if (downPolymorphic != null)
downPolymorphic.invoke(camera, new Object[] { angle });
} catch (Exception e1) {
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.save_pic:
takePic();
break;
case R.id.exposure:
exposureListener();
break;
default:
break;
}
}
private void takePic() {
mCamera.stopPreview();// stop the previe
mCamera.takePicture(null, null, pictureCallback); // picture
}
private void exposureListener() {
Intent intent = new Intent(CameraDemoActivity.this, ExposureAcitivity.class);
startActivityForResult(intent, Constants.EXPOSURE_REQUEST_CODE);
}
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case Constants.UPDATA_TOAST_MSG:
SettingToast.setToastStrLong(CameraDemoActivity.this,
msg.obj.toString() mPictureFile.getPath());
break;
case Constants.IS_HAVE_SDCARD:
SettingToast.setToastStrLong(CameraDemoActivity.this,
msg.obj.toString());
break;
default:
break;
}
}
};
}
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