一.调用照相机
注:surfaceView在当Activity不在前台的时候,会被销毁(onPause方法之后,执行销毁方法)当Activity回到前台时,在Activity执行onResume方法之后,会被重新创建,虽然如此,但并不需要在onResume方法中获取创建事件,因为surfaceView的生命周期可以通过其自身回调函数获取;
public class MainActivity extends Activity {
private Camera camera;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SurfaceView sf = (SurfaceView) findViewById(R.id.sv);
sf.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
sf.getHolder().setFixedSize(176, 176);
sf.getHolder().setKeepScreenOn(true);
sf.getHolder().addCallback(new Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
Camera.Parameters params = camera.getParameters();
Log.e("camera", params.flatten()); // 获取可以设置的参数
// params.setPreviewSize(480, 800);
params.setPreviewFrameRate(5); // 每秒帧数
params.setPictureSize(1024, 768); // 图片大小
params.setJpegQuality(80); // 图片质量
camera.setParameters(params);
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (IOException e) {
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null) {
camera.release(); // 不用之后要释放该对象
}
}
});
}
public void takePicture(View v) {
if (camera != null) {
switch (v.getId()) {
case R.id.take_picture:
camera.takePicture(null, null, new LSPictureCallback());
break;
case R.id.auto_focus:
camera.autoFocus(new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
}
});
break;
}
}
}
private class LSPictureCallback implements PictureCallback {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File jpgFile = new File(Environment.getExternalStorageDirectory(),
System.currentTimeMillis() + "");
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(jpgFile);
outStream.write(data);
outStream.close();
camera.startPreview(); // 照相保存图片之后继续进行画面预览
} catch (Exception e) {
}
}
}
}
二.获取系统默认的相册中的图片的方法
1、打开相册
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, 0x3001);
2、获取选择结果，重写onActivityResult方法
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0x3001 && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA }; Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
iv.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
}
三、 获取图片并截取
File tempFile = new File(Environment.getExternalStorageDirectory().getPath() + "/cpm.jpg");
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
intent.putExtra("crop", "true");// 截取图片
intent.putExtra("aspectX", 1);//
intent.putExtra("aspectY", 1);// 表示x/y方向上的比例,在此设置为1:2
intent.putExtra("output", Uri.fromFile(tempFile));
intent.putExtra("outputFormat", "JPEG");
startActivity(intent);