Java tutorial
/* * Copyright (c) 2017 by Tran Le Duy * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.duy.ascii.sharedcode.image; import android.Manifest; import android.app.Activity; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.provider.MediaStore; import android.support.annotation.Nullable; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.Spinner; import android.widget.Toast; import com.duy.ascii.sharedcode.R; import com.duy.ascii.sharedcode.ShareUtil; import com.duy.ascii.sharedcode.image.converter.AsciiConverter; import com.duy.ascii.sharedcode.image.gallery.GalleryActivity; import java.io.File; import java.io.IOException; import static com.duy.ascii.sharedcode.image.converter.ProcessImageOperation.processImage; /** * Created by Duy on 09-Aug-17. */ public class ImageToAsciiActivity extends AppCompatActivity implements View.OnClickListener { private static final int PICK_IMAGE = 1231; private static final String TAG = "ImageToAsciiFragment"; private static final int TAKE_PICTURE = 1; private static final int REQUEST_PERMISSION = 1002; private ImageView mPreview; private ProgressBar mProgressBar; private Spinner mSpinnerType; private File mResultFile = null; private Uri mOriginalUri = null; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (savedInstanceState != null) { mResultFile = (File) savedInstanceState.getSerializable("result_file"); mOriginalUri = savedInstanceState.getParcelable("origin_uri"); } setContentView(R.layout.activity_image_to_ascii); setSupportActionBar((Toolbar) findViewById(R.id.toolbar)); setTitle(R.string.image_to_ascii); getSupportActionBar().setDisplayHomeAsUpEnabled(true); mPreview = (ImageView) findViewById(R.id.image_preview); findViewById(R.id.btn_select).setOnClickListener(this); mProgressBar = (ProgressBar) findViewById(R.id.progress_bar); mProgressBar.setVisibility(View.GONE); mSpinnerType = (Spinner) findViewById(R.id.spinner_type); mSpinnerType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { if (mOriginalUri != null) { convertImageToAsciiFromIntent(mOriginalUri); } } @Override public void onNothingSelected(AdapterView<?> adapterView) { } }); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (mOriginalUri != null) outState.putParcelable("origin_uri", mOriginalUri); if (mResultFile != null) outState.putSerializable("result_file", mResultFile); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_image_to_ascii, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { int i = item.getItemId(); if (i == android.R.id.home) { this.finish(); return false; } else if (i == R.id.action_share) { shareCurrentImage(); return true; } else if (i == R.id.action_save) { saveImage(); return false; } else if (i == R.id.action_gallery) { startActivity(new Intent(this, GalleryActivity.class)); return false; } return super.onOptionsItemSelected(item); } private void selectImage() { if (!permissionGrated()) { return; } Intent getIntent = new Intent(Intent.ACTION_GET_CONTENT); getIntent.setType("image/*"); Intent pickIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); pickIntent.setType("image/*"); Intent chooserIntent = Intent.createChooser(getIntent, "Select Image"); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] { pickIntent }); startActivityForResult(chooserIntent, PICK_IMAGE); } private boolean permissionGrated() { int state; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { state = ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE); if (state == PackageManager.PERMISSION_GRANTED) { state = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE); } if (state != PackageManager.PERMISSION_GRANTED) { Toast.makeText(this, "Permission denied, please enable permission", Toast.LENGTH_SHORT).show(); String[] permission = new String[] { Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE }; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { requestPermissions(permission, REQUEST_PERMISSION); } return false; } } return true; } @Override public void onActivityResult(int requestCode, int resultCode, Intent intent) { super.onActivityResult(requestCode, resultCode, intent); switch (requestCode) { case PICK_IMAGE: if (resultCode == RESULT_OK) { if (intent != null && intent.getData() != null) { mOriginalUri = intent.getData(); mPreview.setImageBitmap(null); convertImageToAsciiFromIntent(intent.getData()); } else { mOriginalUri = null; mResultFile = null; mPreview.setImageBitmap(null); } } break; case TAKE_PICTURE: this.mOriginalUri = intent.getData(); if (resultCode == Activity.RESULT_OK) { if (intent.getData() != null) { convertImageToAsciiFromIntent(intent.getData()); } else { Toast.makeText(this, "Capture failed", Toast.LENGTH_SHORT).show(); } } break; } } private void convertImageToAsciiFromIntent(Uri uri) { this.mResultFile = null; new TaskConvertImageToAscii(this, getCurrentType()).execute(uri); } private AsciiConverter.ColorType getCurrentType() { switch (mSpinnerType.getSelectedItemPosition()) { case 0: return AsciiConverter.ColorType.ANSI_COLOR; case 1: return AsciiConverter.ColorType.FULL_COLOR; case 2: return AsciiConverter.ColorType.NONE; default: return AsciiConverter.ColorType.ANSI_COLOR; } } @Override public void onClick(View v) { int i = v.getId(); if (i == R.id.btn_save) { saveImage(); } else if (i == R.id.btn_select) { selectImage(); } else if (i == R.id.btn_share) { shareCurrentImage(); } } private void saveImage() { if (mResultFile != null) { addImageToGallery(mResultFile.getPath()); } else { Toast.makeText(this, R.string.null_uri, Toast.LENGTH_SHORT).show(); } } private void shareCurrentImage() { if (mResultFile == null) { Toast.makeText(this, R.string.null_uri, Toast.LENGTH_SHORT).show(); } else { ShareUtil.shareImage(this, mResultFile); } } public void addImageToGallery(final String filePath) { try { ContentValues values = new ContentValues(); values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis()); values.put(MediaStore.Images.Media.MIME_TYPE, "image/png"); values.put(MediaStore.MediaColumns.DATA, filePath); this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); Toast.makeText(this, "Saved in gallery", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show(); } } private class TaskConvertImageToAscii extends AsyncTask<Uri, Void, File> { private Context context; private AsciiConverter.ColorType type; TaskConvertImageToAscii(Context context, AsciiConverter.ColorType type) { this.context = context; this.type = type; } @Override protected void onPreExecute() { super.onPreExecute(); mProgressBar.setVisibility(View.VISIBLE); } @Override protected File doInBackground(Uri... params) { try { String output = processImage(context, params[0], type); if (output != null) { return new File(output); } } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(final File uri) { super.onPostExecute(uri); if (uri == null) { Toast.makeText(context, "IO Exception", Toast.LENGTH_SHORT).show(); } else { mPreview.setImageURI(Uri.fromFile(uri)); mResultFile = uri; } mProgressBar.setVisibility(View.GONE); } } }