我正在尝试编写一个拍照并将数据和图像保存到 SD 卡的活动，我可以在其中读取图像数据并将其输出。但是，我在 showPhoto() 方法中收到错误“构造函数文件（Uri）未定义。”）。有人可以帮忙吗？？
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.preference.PreferenceManager.OnActivityResultListener;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class CallCamera extends Activity {
private static final String TAG = "CallCamera";
private static final int CAPTURE_IMAGE_ACTIVITY_REQ = 0;
Uri fileUri = null;
ImageView photoImage = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call_camera);
photoImage=(ImageView) findViewById(R.id.photo_image);
Button callCameraButton = (Button)findViewById(R.id.button_callcamera);
callCameraButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View view){
Intent i= new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = getOutputPhotoFile();
fileUri=Uri.fromFile(getOutputPhotoFile());
i.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(i, CAPTURE_IMAGE_ACTIVITY_REQ); //returns photo file to activity when camera is done
}
//store photo taken on SD card
private File getOutputPhotoFile() {
File directory = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),getPackageName());
if (!directory.exists()){
if(!directory.mkdirs()){
Log.e(TAG,"Failed to create storage directory.");
return null;
}
}
//set photo name with standard time linked and store on sdCard in standard picture directory
String timeStamp = new SimpleDateFormat("yyyMMdd_HHmmss",Locale.ENGLISH).format(new Date());
return new File(directory.getPath() + File.separator + "IMG_"+timeStamp+".jpg");
}
protected void onActivityResult (int requestCode, int resultCode, Intent data){
if (requestCode==CAPTURE_IMAGE_ACTIVITY_REQ){
if(resultCode==RESULT_OK){
Uri photoUri = null;
if (data==null){
//confirming image save
Toast.makeText(CallCamera.this, "Image saved successfully", Toast.LENGTH_LONG).show();
photoUri=fileUri;
} else {
photoUri = data.getData();
Toast.makeText(CallCamera.this, "imaged saved successfully in: " + data.getData(), Toast.LENGTH_LONG).show();
}
photoUri = data.getData();
showPhoto(photoUri);
} else if (resultCode==RESULT_CANCELED) {
Toast.makeText( CallCamera.this,"Cancelled", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(CallCamera.this, "Callout for image capture failed!", Toast.LENGTH_LONG).show();
}
}
}
});
}
protected void showPhoto(Uri photoUri) {
File imageFile = new File(photoUri);
if (imageFile.exists()){
Drawable oldDrawable = photoImage.getDrawable();if(oldDrawable !=null) { ((BitmapDrawable)oldDrawable).getBitmap().recycle();
}
}
if (imageFile.exists()){
Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
BitmapDrawable drawable = new BitmapDrawable(this.getResources(),bitmap);
photoImage.setScaleType(ImageView.ScaleType.FIT_CENTER);;
photoImage.setImageDrawable(drawable);
}
}