【Android】開啟相機-照相功能與相簿-相片集並讀取相片匯入至程式

infor from : http://dean-android.blogspot.tw/2013/05/android.html

各位Android安卓開發者大家好 ^^
小黑人今天要跟大家分享的是如何"開啟相機"與"開啟相簿"並且將"圖片讀取匯入至程式內"，如果各位開發者有接觸到拍照及相簿功能的話，那今天這個主題就會非常的息息相關囉，而且照相這個功能其實可以運用在很多地方，像Google Play上也有許許多多的拍照APP或者是圖片編輯APP，而這些APP都是跟開啟相機進行照相或者是從SD卡讀取相片圖片有關係，今天小黑人就與大家分享如何簡單的將照片匯入至程式內。

1.首先，要開啟相機功能與拍照後將相片存入SD卡內，則需要在AndroidManifest.xml開啟權限，所以我們先在AndroidManifest加入開啟相機權限與寫入SD卡權限 : <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2.Layout版面配置，小黑人自己先大概排個版面，畫面上有開啟相機Button、開啟相簿Button及顯示匯入照片的ImageView :<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/img" android:layout_width="match_parent" android:layout_height="300dip" /> <Button android:id="@+id/camera" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="開啟相機" android:layout_weight="1" android:layout_gravity="center_vertical" /> <Button android:id="@+id/photo" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="開啟相簿" android:layout_weight="1" android:layout_gravity="center_vertical" /> </LinearLayout>
3.最後就是開啟程式(.java)將各功能寫入啦 :public class MainActivity extends Activity { //宣告 private ImageView mImg; private DisplayMetrics mPhone; private final static int CAMERA = 66 ; private final static int PHOTO = 99 ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //讀取手機解析度 mPhone = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(mPhone); mImg = (ImageView) findViewById(R.id.img); Button mCamera = (Button) findViewById(R.id.camera); Button mPhoto = (Button) findViewById(R.id.photo); mCamera.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //開啟相機功能，並將拍照後的圖片存入SD卡相片集內，須由startActivityForResult且帶入 requestCode進行呼叫，原因為拍照完畢後返回程式後則呼叫onActivityResult ContentValues value = new ContentValues(); value.put(Media.MIME_TYPE, "image/jpeg"); Uri uri= getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, value); Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri.getPath()); startActivityForResult(intent, CAMERA); } }); mPhoto.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //開啟相簿相片集，須由startActivityForResult且帶入requestCode進行呼叫，原因為點選相片後返回程式呼叫onActivityResult Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(intent, PHOTO); } }); } //拍照完畢或選取圖片後呼叫此函式 @Override protected void onActivityResult(int requestCode, int resultCode,Intent data) { //藉由requestCode判斷是否為開啟相機或開啟相簿而呼叫的，且data不為null if ((requestCode == CAMERA \|\| requestCode == PHOTO ) && data != null) { //取得照片路徑uri Uri uri = data.getData(); ContentResolver cr = this.getContentResolver(); try { //讀取照片，型態為Bitmap Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri)); //判斷照片為橫向或者為直向，並進入ScalePic判斷圖片是否要進行縮放 if(bitmap.getWidth()>bitmap.getHeight())ScalePic(bitmap, mPhone.heightPixels); else ScalePic(bitmap,mPhone.widthPixels); } catch (FileNotFoundException e) { } } super.onActivityResult(requestCode, resultCode, data); } private void ScalePic(Bitmap bitmap,int phone) { //縮放比例預設為1 float mScale = 1 ; //如果圖片寬度大於手機寬度則進行縮放，否則直接將圖片放入ImageView內 if(bitmap.getWidth() > phone ) { //判斷縮放比例 mScale = (float)phone/(float)bitmap.getWidth(); Matrix mMat = new Matrix() ; mMat.setScale(mScale, mScale); Bitmap mScaleBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), mMat, false); mImg.setImageBitmap(mScaleBitmap); } else mImg.setImageBitmap(bitmap); } }
畫面預覽 :


以上就是今天小黑人跟大家分享的內容，照相與相簿的匯入運用，希望大家可以試試看~ ^^ 如有任何問題可以跟小黑人討論交流唷！謝謝大家 XDD

[Android] Activity之間如何透過Intent傳遞複雜結構的data

http://jimmy319.blogspot.tw/2011/12/android-activityintentdata-structure.html

Get/pick an image from Android's built-in Gallery app programmatically

http://stackoverflow.com/questions/2169649/get-pick-an-image-from-androids-built-in-gallery-app-programmatically

This is a complete solution. I've just updated this example code with the information provided in the answer below by @mad. Also check the solution below from @Khobaib explaining how to deal with picasa images.

Single Picture Selection

With support for images from file explorers thanks to user mad.

public class BrowsePictureActivity extends Activity {

    // this is the action code we use in our intent, 
    // this way we know we're looking at the response from our own action
    private static final int SELECT_PICTURE = 1;

    private String selectedImagePath;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ((Button) findViewById(R.id.Button01))
                .setOnClickListener(new OnClickListener() {

                    public void onClick(View arg0) {

                        // in onCreate or any event where your want the user to
                        // select a file
                        Intent intent = new Intent();
                        intent.setType("image/*");
                        intent.setAction(Intent.ACTION_GET_CONTENT);
                        startActivityForResult(Intent.createChooser(intent,
                                "Select Picture"), SELECT_PICTURE);
                    }
                });
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
            }
        }
    }

    /**
     * helper to retrieve the path of an image URI
     */
    public String getPath(Uri uri) {
            // just some safety built in 
            if( uri == null ) {
                // TODO perform some logging or show user feedback
                return null;
            }
            // try to retrieve the image from the media store first
            // this will only work for images selected from gallery
            String[] projection = { MediaStore.Images.Media.DATA };
            Cursor cursor = managedQuery(uri, projection, null, null, null);
            if( cursor != null ){
                int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                return cursor.getString(column_index);
            }
            // this is our fallback here
            return uri.getPath();
    }

}

Selecting Multiple Pictures

Since someone requested that information in a comment and it's better to have information gathered.

Set an extra parameter EXTRA_ALLOW_MULTIPLE on the intent:

intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

And in the Result handling check for that parameter:

if (Intent.ACTION_SEND_MULTIPLE.equals(action))
        && Intent.hasExtra(Intent.EXTRA_STREAM)) {
    // retrieve a collection of selected images
    ArrayList<Parcelable> list = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
    // iterate over these images
    for (Parcelable parcel : list) {
       Uri uri = (Uri) parcel;
       // handle the images one by one here
   }
}

Note that this is only supported by API level 18+.

Android Rookie

2014年7月29日星期二

【Android】開啟相機-照相功能與相簿-相片集並讀取相片匯入至程式