Shulou(Shulou.com)06/01 Report--

This article introduces the relevant knowledge of "how to use regular matching pictures in Android". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Xml

Activity

Control, I put all the pictures in the phone's memory, all of which must be read first.

Get permissions in the AndroidManifest.xml file

Package com.example.mygesture;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Environment;import android.os.PatternMatcher;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.GestureDetector;import android.view.MotionEvent;import android.widget.ImageView;import android.widget.Toast;import android.widget.ViewFlipper;import java.io.InputStream;import java.util.LinkedList;import java.util.List;import java.util.regex.Matcher Import java.util.regex.Pattern;public class MainActivity extends AppCompatActivity {private ViewFlipper viewFlipper; private List list=new LinkedList (); private GestureDetector jc; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); / / fetch control viewFlipper = (ViewFlipper) findViewById (R.id.vf_main_one) / / determine whether if (Environment.getExternalStorageState (). Equals (Environment.MEDIA_MOUNTED)) {/ / fetch the absolute path of the memory card String abspath=Environment.getExternalStorageDirectory () .getAbsolutePath (); / / create the file object File file=new File (abspath); / / fetch all files and folders in the memory card [] filetwo=file.listFiles () For (File file1: filetwo) {try {/ / calls the recursive method TraversalSearch (file1) of the file;} catch (IOException e) {e.printStackTrace () The pictures in the collection are all pictures in the memory card for (ImageView imageView: list) {/ / add all pictures in the collection to the (ViewFlipper) control viewFlipper.addView (imageView) } / / set up gesture detector. Parameter 1: detection event jc of context parameter 2 detector jc = new GestureDetector (this,new GestureDetector.OnGestureListener () {@ Override public boolean onDown (MotionEvent e) {/ / trigger return false } @ Override public void onShowPress (MotionEvent e) {} @ Override public boolean onSingleTapUp (MotionEvent e) {/ / tap trigger return false;} @ Override public boolean onScroll (MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {/ / Mobile trigger return false } @ Override public void onLongPress (MotionEvent e) {/ / often press trigger} @ Override / / after sliding, trigger public boolean onFling (MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {/ / this method, parameter 1: start position parameter 2: end position Parameter 3-4: X-axis y-axis if (e2.getX ()-e1.getX () > 200) {/ / display the previous viewFlipper.showPrevious () Toast.makeText (MainActivity.this, Toast.LENGTH_SHORT). Show ();} if (e1.getX ()-e2.getX () > 200) {/ / display the next viewFlipper.showNext (); Toast.makeText (MainActivity.this, "004", Toast.LENGTH_SHORT). Show ();} return false;}}) } @ Override / / rewrite the touch callback function public boolean onTouchEvent (MotionEvent event) {/ / set the touch function to the gesture detector, must write! Return jc.onTouchEvent (event);} / / query the recursive method public void TraversalSearch (File file) throws IOException {if (file.isDirectory ()) {File [] filetwo=file.listFiles (); for (File file1: filetwo) {TraversalSearch (file1);}} else {String name=file.getName () / / Image format String regStr = "[Gg] [Ii] [Ff] | [Jj] [Pp] [Gg] | [Bb] [Mm] [Pp] | [Jj] [Pp] [Ee] [Gg]"; / / put the regular matching format into the class Pattern pattern = Pattern.compile (regStr); / / put the matching format into Matcher matcher = pattern.matcher (name) / / matching result, which matches true and false if (matcher.find ()) {ImageView image=new ImageView (this); / / gets the file Bitmap bitmap= BitmapFactory.decodeFile (file.getAbsolutePath (). Trim ()) through the drawing factory and uses the file path; / / sets the picture file into the picture control image.setImageBitmap (bitmap); if (list.size ())

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