Bài 29: Làm việc với camera

Xây dựng ứng dụng chụp hình:

1. AndroidManifest.xml:

<uses-feature android:name="android.hardware.camera2"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>

2. activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="camerademo.hkh.com.camera_demo.MainActivity"
    android:orientation="vertical">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="89dp">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Take a picture"
            android:id="@+id/btnCapturePicture"
            android:layout_gravity="center_horizontal" />
    </LinearLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/imgPreview"
            android:visibility="gone"/>
    </LinearLayout>
</LinearLayout>

3. MainActivity.java:

package camerademo.hkh.com.camera_demo;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Locale;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
    public static final int MEDIA_TYPE_IMAGE = 1;
    private static final String IMAGE_DIRECTORY_NAME = "CameraImage";
    private Uri fileUri; //store image
    private ImageView imgPreview;
    private Button btnCapturePicture;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imgPreview = (ImageView) findViewById(R.id.imgPreview);
        btnCapturePicture = (Button) findViewById(R.id.btnCapturePicture);
        btnCapturePicture.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnCapturePicture:
                CaptureImage();
                break;
        }
    }

    private void CaptureImage() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
    }

    public Uri getOutputMediaFileUri(int type) {
        return Uri.fromFile(getOutputMediaFile(type));
    }

    public File getOutputMediaFile (int type) {
        File mediaStorageDir = new File( Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                                         IMAGE_DIRECTORY_NAME);
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdir()) {
                Log.i(IMAGE_DIRECTORY_NAME, "create failed !!!!");
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
        File mediaFile;

        if (type == MEDIA_TYPE_IMAGE) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
        } else {
            return null;
        }
        return mediaFile;
    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
                previewCapturedImage();
            } else  if (resultCode == RESULT_CANCELED) {
                Toast.makeText(getApplicationContext(), "User cancelled image capture", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getApplicationContext(), "Failed to capture image", Toast.LENGTH_SHORT).show();
            }
        }
    }

    private void previewCapturedImage() {
        try {
            imgPreview.setVisibility(View.VISIBLE);
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = 1;
            final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(), options);
            imgPreview.setImageBitmap(bitmap);
        } catch (NullPointerException e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Error ---------", Toast.LENGTH_SHORT).show();
        }
    }

}

Download sourcode demo link:

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Test

test

compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'

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JSON

Lib: https://drive.google.com/file/d/0B8tAQ0_sJKCSRlFXbFNFUENYbDg/view?usp=sharing

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