android影像編輯和處理（一）

android影像編輯和處理（一）

1.使用內建Gallery應用程式選擇映像：

 

package com.example.testphotoedit;import java.io.FileNotFoundException;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Paint;import android.net.Uri;import android.os.Bundle;import android.view.Display;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity implements OnClickListener {private ImageView chosenImageView,copyPicture;private Button choosePicture;private Uri imageFileUri;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.fragment_main);choosePicture = (Button) findViewById(R.id.button_chose);chosenImageView = (ImageView) findViewById(R.id.chose_picture);copyPicture=(ImageView) findViewById(R.id.copy_picture);choosePicture.setOnClickListener(this);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (v.getId() == R.id.button_chose) {Intent chooseIntent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);//啟動Gallery應用程式startActivityForResult(chooseIntent, 0);}}

/* (non-Javadoc) * @see android.app.Activity#onActivityResult(int, int, android.content.Intent) *  * 在返回的意圖資料中，返回選擇的映像的URI */@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if (resultCode == RESULT_OK) {imageFileUri = data.getData();Display currentDisply = getWindowManager().getDefaultDisplay();int dw = currentDisply.getWidth() / 2 - 100;int dh = currentDisply.getHeight() / 2 - 100；

try {

 

BitmapFactory.Options bmpFactory = new BitmapFactory.Options();bmpFactory.inJustDecodeBounds = true;//載入映像的尺寸而非映像本身Bitmap bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageFileUri), null, bmpFactory);int heightRatio = (int) Math.ceil(bmpFactory.outHeight/ (float) dh);int widthRatio = (int) Math.ceil(bmpFactory.outWidth/ (float) dw);if (heightRatio > 1 && widthRatio > 1) {if (heightRatio > widthRatio) {bmpFactory.inSampleSize = heightRatio;} else {bmpFactory.inSampleSize = widthRatio;}}bmpFactory.inJustDecodeBounds = false;//載入真實的映像bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageFileUri), null, bmpFactory);chosenImageView.setImageBitmap(bmp);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

 

 

2.在位元影像上繪製位元影像

 

Bitmap alteredBitmap = Bitmap.createBitmap(bmp.getWidth(),bmp.getWidth(), bmp.getConfig());Canvas canvas=new Canvas(alteredBitmap);Paint  paint=new Paint();canvas.drawBitmap(bmp, 0,0, paint);copyPicture.setImageBitmap(alteredBitmap);

註：有什麼不懂的可以留言。。