Android Camera Parameters 方法出错，求教-白红宇

Android Camera Parameters 方法出错，求教

阅读量：4503 次

发布时间：2019-06-08

本文共 8105 字，大约阅读时间需要 27 分钟。

============问题描述============

public class PhotographActivity extends BaseActivity implements

SeekBar.OnSeekBarChangeListener, OnClickListener, Runnable {

private SeekBar zoomSet;// 调整焦距

private ImageView takePic, back, flash;// 按钮

private final int FLASH_AUTO = 0;// 自动闪光

private final int FLASH_OFF = 1;// 闪光灯关闭

private final int FLASH_ON = 2; // 闪光灯打开

private int flashImg[] = { R.drawable.light_auto_confirm,

R.drawable.light_off_confirm, R.drawable.light_on_confirm };// 闪光灯图标

private int zoom, maxZoom;// zoom现在焦距，maxZoom最大焦距

private boolean preview = false, flashOpen = false;// preview预览 flashOpen闪光灯

private Camera camera;// 硬件相机

private SurfaceView cameraBG;// 相机预览

@SuppressWarnings("unused")

private Uri videoFilePath;

// PopupWindow和AlertDialog都是Android对话框的内容,不同的是PopupWindow是阻塞式对话框

PopupWindow popupWindow;

Camera.Parameters parameters;// 照相机参数集

@Override

public void onCreate(Bundle savedInstanceState) {

if (!Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED)) {// SD卡允许读写

Toast.makeText(PhotographActivity.this, "SD卡没有插入或不能读写",

Toast.LENGTH_LONG).show();

}

Window window = getWindow();

// 只要这个窗口是用户可见的，保持设备的屏幕打开及明亮。

window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

// 选择支持半透明模式,在有surfaceview的activity中使用。

window.setFormat(PixelFormat.TRANSLUCENT);

BaseActivity.isFullSreen = true;

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_photograph);

init();

}

@SuppressLint("NewApi")

private void init() {

takePic = (ImageView) findViewById(R.id.btn_picture);// 拍照

back = (ImageView) findViewById(R.id.btn_backcapter);// 返回

flash = (ImageView) findViewById(R.id.btn_flash);// 调整闪光效果

zoomSet = (SeekBar) findViewById(R.id.seekbar_focal);// 调整焦距

cameraBG = (SurfaceView) findViewById(R.id.camrea);// 相机预览

// 固定surfaceView的高宽

cameraBG.getHolder().setFixedSize((int) BaseActivity.ScreenW,

(int) BaseActivity.ScreenH);

// 设置该surfaceView不用自己维护缓冲区

cameraBG.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

// 设置surfaceView的回调函数

cameraBG.getHolder().addCallback(new SurfaceCallback());

zoomSet.setOnSeekBarChangeListener(this);

takePic.setOnClickListener(this);

back.setOnClickListener(this);

flash.setOnClickListener(this);

cameraBG.setOnClickListener(this);

}

private final class SurfaceCallback implements SurfaceHolder.Callback {

@Override

public void surfaceCreated(SurfaceHolder holder) {

if (camera != null) {

camera.release();// 相机释放

}

camera = Camera.open();// 打开相机

camera.setDisplayOrientation(90);// 旋转镜头

parameters = camera.getParameters();// 获取相机参数集

if (parameters.getFlashMode() == null) {

flash.setImageBitmap(BitmapFactory.decodeResource(

getResources(), flashImg[FLASH_OFF]));

Toast.makeText(PhotographActivity.this, "无闪光灯",

Toast.LENGTH_SHORT).show();

} else {

parameters.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);

parameters.setPreviewSize(100, 120);// 设置预览照片的大小

parameters.setPictureFormat(ImageFormat.JPEG);//设置图片格式

parameters.setPictureSize(100, 120);// 设置照片的大小

camera.setParameters(parameters);

}

maxZoom = parameters.getMaxZoom();// 获取最大像素

zoomSet.setMax(maxZoom);// 设置最大像素

try {

camera.setPreviewDisplay(cameraBG.getHolder());// 设置相机预览

} catch (IOException e) {

e.printStackTrace();

}

camera.startPreview();// 开始预览

preview = true;

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

if (camera != null) {

if (preview) {

camera.stopPreview();

}

camera.release();

}

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

if (camera != null && event.getRepeatCount() == 0) {

switch (keyCode) {

case KeyEvent.KEYCODE_CAMERA:

case KeyEvent.KEYCODE_DPAD_CENTER:

takPicture();

break;

case KeyEvent.KEYCODE_VOLUME_UP:

zoom = (zoom + 5) < maxZoom ? (zoom + 5) : maxZoom;

zoomSet.setProgress(zoom);

break;

case KeyEvent.KEYCODE_VOLUME_DOWN:

zoom = (zoom - 5) > 0 ? (zoom - 5) : 0;

zoomSet.setProgress(zoom);

break;

case KeyEvent.KEYCODE_BACK:

if (flashOpen) {

popupWindow.dismiss();

} else {

finish();

}

return true;

}

private final class TakePictureCallback implements PictureCallback {

@Override

public void onPictureTaken(byte[] data, Camera camera) { }

}

public void takPicture() {

camera.autoFocus(null);// 自动对焦

camera.takePicture(null, null, null, new TakePictureCallback());

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

zoom = zoomSet.getProgress();

parameters.setZoom(zoom);

camera.setParameters(parameters);

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.btn_picture:

takPicture();

break;

case R.id.btn_backcapter:

if (flashOpen) {

popupWindow.dismiss();

} else {

finish();

}

break;

case R.id.btn_flash:

if (parameters.getFlashMode() == null) {

Toast.makeText(PhotographActivity.this, "无闪光灯",

Toast.LENGTH_SHORT).show();

} else if (parameters.getFlashMode() == Camera.Parameters.FLASH_MODE_AUTO) {

flash.setImageBitmap(BitmapFactory.decodeResource(

getResources(), flashImg[FLASH_OFF]));

parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);

camera.setParameters(parameters);

} else if (parameters.getFlashMode() == Camera.Parameters.FLASH_MODE_OFF) {

flash.setImageBitmap(BitmapFactory.decodeResource(

getResources(), flashImg[FLASH_ON]));

parameters.setFlashMode(Camera.Parameters.FLASH_MODE_ON);

camera.setParameters(parameters);

} else if (parameters.getFlashMode() == Camera.Parameters.FLASH_MODE_ON) {

flash.setImageBitmap(BitmapFactory.decodeResource(

getResources(), flashImg[FLASH_AUTO]));

parameters.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);

camera.setParameters(parameters);

}

break;

case R.id.camrea:

camera.autoFocus(null);

break;

}

@Override

protected void onPause() {

super.onPause();

zoomSet.setProgress(0);// 让SeekBar条初始化

}

public void run() {

while (true) {

if (camera != null) {

camera.autoFocus(null);

}

try {

Thread.sleep(400);

} catch (InterruptedException e) {

e.printStackTrace();

}

程序中一旦屏蔽红字部分的代码

parameters.setPreviewSize(100, 120);// 设置预览照片的大小

parameters.setPictureFormat(ImageFormat.JPEG);//设置图片格式

parameters.setPictureSize(100, 120);// 设置照片的大小

就能正常的实现手机照相功能了

如果不屏蔽[ color=#FF0000] parameters.setPreviewSize(100, 120);// 设置预览照片的大小

parameters.setPictureFormat(ImageFormat.JPEG);//设置图片格式

parameters.setPictureSize(100, 120);// 设置照片的大小

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Log日志则会报如下错误：