編輯:關於android開發
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/take_photo" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Take Photo" /> <Button android:id="@+id/get_photo" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="get Photo" /> <ImageView android:id="@+id/picture" android:layout_width="300dp" android:layout_height="300dp" android:layout_gravity="center_horizontal" /> </LinearLayout>
package com.example.choosepictest; import java.io.File; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity implements OnClickListener { static final int REQUEST_IMAGE_CAPTURE = 1; private Button takePhoto; private Button getPhoto; private ImageView picture; private Uri imgUri; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); takePhoto = (Button) findViewById(R.id.take_photo); getPhoto = (Button) findViewById(R.id.get_photo); picture = (ImageView) findViewById(R.id.picture); takePhoto.setOnClickListener(this); getPhoto.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.take_photo: dispatchTakePictureIntent(); break; default: break; } } // 保存全尺寸照片 String mCurrentPhotoPath; private void dispatchTakePictureIntent() { File appDir = new File(Environment.getExternalStorageDirectory(), "/etoury/picCache"); if (!appDir.exists()) { appDir.mkdirs(); } String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss") .format(new Date()); String fileName = timeStamp + ".jpg"; File outputImage = new File(appDir, fileName); try { if (outputImage.exists()) { outputImage.delete(); } outputImage.createNewFile(); } catch (IOException e) { e.printStackTrace(); } mCurrentPhotoPath = outputImage.getAbsolutePath(); imgUri = Uri.fromFile(outputImage); // 意圖 相機 Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri); // 如果有相機 if (intent.resolveActivity(getPackageManager()) != null) { startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); } } //解碼縮放圖片(Decode a Scaled Image) private void setPic() { // Get the dimensions of the View int targetW = picture.getWidth(); int targetH = picture.getHeight(); // Get the dimensions of the bitmap BitmapFactory.Options bmOptions = new BitmapFactory.Options(); // 該 值設為true那麼將不返回實際的bitmap,也不給其分配內存空間這樣就避免內存溢出了。但是允許我們查詢圖片的信息這其中就包括圖片大小信息 bmOptions.inJustDecodeBounds = true; BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); int photoW = bmOptions.outWidth; int photoH = bmOptions.outHeight; // Determine how much to scale down the image // Math.min求最小值 int scaleFactor = Math.min(photoW/targetW, photoH/targetH); // Decode the image file into a Bitmap sized to fill the View bmOptions.inJustDecodeBounds = false; // 設置恰當的inSampleSize可以使BitmapFactory分配更少的空間以消除該錯誤 bmOptions.inSampleSize = scaleFactor; // 如果inPurgeable設為True的話表示使用BitmapFactory創建的Bitmap,用於存儲Pixel的內存空間在系統內存不足時可以被回收 bmOptions.inPurgeable = true; Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); picture.setImageBitmap(bitmap); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { switch (requestCode) { case REQUEST_IMAGE_CAPTURE: galleryAddPic(); setPic(); break; default: break; } } }
//發送一條通知添加照片到相冊
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
mediaScanIntent.setData(imgUri);
this.sendBroadcast(mediaScanIntent);
} }
Android仿聯系人列表分組懸浮列表實現,自定義PinnedHeaderListView實現 效果 (關於gif怎麼生成的,我先錄手機的屏幕得到mp4文件,然
Android Support Library 之 Toolbar 在 Android 3.0 開始 ,所有的主題默認把 ActionBar 作為默認的 Ap
Android Animation學習 實現 IOS 濾鏡退出動畫,androidiosIOS的用戶體驗做的很好,其中一點很重要的地方就是動畫效果。 最近在學習Andro
Android應用程序安裝過程淺析 我們知道在android中,安裝應用是由PackageManager來管理的,但是我們發現PackageManager是一個抽象類