Android camera2

Question

我正在尝试创建简单的相机应用程序。以下是源代码：

package com.homeinc.basiccamera2.app;   
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;


public class MainActivity extends AppCompatActivity {

    public static final int CAPTURE_IMAGE_ACTIVITY_REQUST_CODE = 100;
    private static final int MEDIA_TYPE_IMAGE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    @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);
    }

    public  void takePicture(View view){
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        Uri fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUST_CODE);
    }

    private Uri getOutputMediaFileUri(int type) {
        File imagesFolder = new File(Environment.getExternalStoragePublicDirectory(
                                     Environment.DIRECTORY_PICTURES),"myPics");
        if (!imagesFolder.exists()){
            if (!imagesFolder.mkdirs()){
                Log.d("BasicCamera2","cant create dir");
            }
        }
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        File image = new File(imagesFolder.getPath()+File.separator+"IMG_"+timeStamp+".jpg");
        Uri uriSavedImage = Uri.fromFile(image);
        return uriSavedImage;
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUST_CODE && data != null){
            if (resultCode == RESULT_OK){
                Toast.makeText(this, "saved: " + data.getAction(), Toast.LENGTH_LONG).show();
            }
            else if (resultCode == RESULT_CANCELED){
                // canceled
                Toast.makeText(this, "saved: " + data.getAction(), Toast.LENGTH_LONG).show();
            } else {
                // fail
                Toast.makeText(this, "cant save: " + data.getAction(), Toast.LENGTH_LONG).show();
            }
        }
    }
}

看看onActivityResult方法--它有3个参数，它应该在data param中接收来自意图的数据，但是它总是空的。请告诉我我做错了什么？

Answer 1

我认为这样的东西(您只需要定义目录和文件名)应该对您有好处。在给出文件的位置时，不需要使用获取图片的意图。

private void takePicture() {
    File newdir = new File(getImageDir());
    newdir.mkdirs();

    String file = getFileName();
    File newfile = new File(file);
    try {
        newfile.createNewFile();
    } catch (IOException e) {}

    Uri outputFileUri = Uri.fromFile(newfile);

    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

    startActivityForResult(cameraIntent, CAPTURE_IMAGE_ACTIVITY_REQUST_CODE);
}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUST_CODE && resultCode == RESULT_OK) {
        useFileName(getFileName());
    }
}