How to use the system camera and camera

How to use the system camera and camera
1. Call the System camera to take a photo

Package com. android. myapplication; import android. content. intent; import android. graphics. bitmap; import android. graphics. bitmapFactory; import android. graphics. point; import android. graphics. drawable. bitmapDrawable; 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; impor T android. view. display; import android. view. view; import android. view. window; import android. widget. imageView; import android. widget. linearLayout; import java. io. file; import java. text. simpleDateFormat; import java. util. date; public class MainActivity extends AppCompatActivity {private ImageView iv1; private File imgFile; private LinearLayout ll; @ Override protected void onCreate (Bundle savedInstanceStat E) {super. onCreate (savedInstanceState); supportRequestWindowFeature (Window. FEATURE_NO_TITLE); setContentView (R. layout. activity_main); initView ();} private void initView () {iv1 = (ImageView) findViewById (R. id. iv1); ll = (LinearLayout) findViewById (R. id. ll);} // obtain the public void sys_capture (View view) {startActivityForResult (new Intent (MediaStore. ACTION_IMAGE_CAPTURE), 0);} // obtain the source image taken by the system. Public void orig_capture (View view) {Intent intent = new Intent (MediaStore. ACTION_IMAGE_CAPTURE); // The image name String pic_name = "IMG _" + new SimpleDateFormat ("yyyyMMdd_hhmmssSSS "). format (new Date () + ". jpg "; // image save path String pic_dir = Environment. getExternalStorageDirectory (). getAbsolutePath () + File. separator + "MyPicture"; File file = new File (pic_dir); if (! File. exists () {file. mkdirs ();} // image File imgFile = new File (pic_dir + File. separator + pic_name); Uri imgFileUri = Uri. fromFile (imgFile); intent. putExtra (MediaStore. EXTRA_OUTPUT, imgFileUri); // specifies the position where the image is saved after the system takes a picture. startActivityForResult (intent, 1) ;}@ Override protected void onActivityResult (int requestCode, int resultCode, Intent data) {if (RESULT_ OK = resultCode) {switch (requestCode) {case 0: {Bundle bundle = data. getExtras (); // get the container Bitmap bitmap = (Bitmap) bundle in the intent. get ("data"); // figure iv1.setImageBitmap (bitmap); break;} case 1: {Bitmap bitmap = getFitBitMap (); ll. setBackground (new BitmapDrawable (getResources (), bitmap); break ;}}}} /*** assume that the size of the image is x 50, and the size I need to display is 50x40 *. In this case, the image size must be halved to display the image in full. That is, the compression ratio of inSampleSize is 2 * ratio of source image to display image width: 100/50 = 2 * Ratio of the original image to the height of the display image: 50/40 = 1.25 *, the compression ratio is inSampleSize = the maximum aspect ratio is 2 * @ return */private Bitmap getFitBitMap () {// 1. obtain the image width and height BitmapFactory. options options = new BitmapFactory. options (); options. inJustDecodeBounds = true; // obtain the image attribute BitmapFactory only if the image is not encoded. decodeFile (imgFile. getAbsolutePath (), options); int imgWidth = options. outWidth; int imgHeight = options. outHeight; Log. e ("=", "" + imgWidth + "---" + imgHeight); // 2. get screen width and height Display defaultDisplay = getWindowManager (). getdefadisplay display (); Point outSize = new Point (); defaultDisplay. getSize (outSize); int screenWidth = outSize. x; int screenHeight = outSize. y; Log. e ("=", "" + screenWidth + "---" + screenHeight); // 3. calculate the compression ratio int widthRatio = (int) Math. ceil (imgWidth/screenWidth); // ceil indicates to take an integer up. That is, if the decimal part is not 0, 1 int heightRatio = (int) Math is added to the integer part. ceil (imgHeight/screenHeight); int fitInSampleSize = Math. max (widthRatio, heightRatio); // 4. compress the image options according to the compression ratio. inSampleSize = fitInSampleSize; options. inJustDecodeBounds = false; Bitmap fitBitmap = BitmapFactory. decodeFile (imgFile. getAbsolutePath (), options); return fitBitmap ;}}