Android camera预览参数以及实际图像大小设置

参考一下两篇博文：

http://www.cnblogs.com/skyseraph/archive/2012/03/26/2418665.html

http://blog.csdn.net/yanzi1225627/article/details/7738736

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PreviewSize是预览的大小，也就是拍照前看到的图片大小

PictureSize是指最终拍摄到的图片的大小，也就是图片的质量

新建一个工程PictureDemo，默认空活动

完成后，在MainActivity上添加代码：

[java] view plain copy

package com.administrator.picturedemo;
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import java.util.List;
public class MainActivity extends Activity {
private final String TAG = "test";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Camera camera = Camera.open();
List pictureSizes = camera.getParameters().getSupportedPictureSizes();
List previewSizes = camera.getParameters().getSupportedPreviewSizes();
for (int i=0; i
Camera.Size pSize = pictureSizes.get(i);
Log.i(TAG+"-------initCamera", "---------------------PictureSize.width = "+pSize.width+"-----------------PictureSize.height = "+pSize.height);
}
for (int i=0; i
Camera.Size pSize = previewSizes.get(i);
Log.i(TAG+"--------initCamera", "--------------------previewSize.width = "+pSize.width+"-----------------previewSize.height = "+pSize.height);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

在AndroidManifest.xml中添加权限：

[java] view plain copy

"android.permission.CAMERA" />

运行，在LogCat上自定义过滤器test，查看该过滤器得到

上图中的这些参数就是可以设置的previewSize和pictureSize大小

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获得了最终的图像，但是大小却不是我们希望的，所以想要去修改大小

实例程序，获得bitmap图像myBitmap，改为600x800大小的图像

[java] view plain copy

String readPath = "/sdcard/desktop.jpg";
String writePah = "/sdcard/picSize.jpg";
Bitmap myBitmap = BitmapFactory.decodeFile(readPath);
File img = new File(writePah);
try {
img.createNewFile();
FileOutputStream fos = new FileOutputStream(img);
Bitmap endBit = Bitmap.createScaledBitmap(myBitmap, 600, 800, true); //创建新的图像大小
endBit.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

如果不想修改结果大小，则将

[java] view plain copy

Bitmap endBit = Bitmap.createScaledBitmap(myBitmap, 600, 800, true); //创建新的图像大小
endBit.compress(Bitmap.CompressFormat.PNG, 100, fos);

改为

[java] view plain copy

myBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);

即可

添加权限

[java] view plain copy

"android.permission.WRITE_EXTERNAL_STORAGE" />

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