<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();
}
}
}
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