Android 相機與圖庫

標籤：

  1 import android.content.Intent;  2 import android.graphics.Bitmap;  3 import android.graphics.BitmapFactory;  4 import android.net.Uri;  5 import android.os.Environment;  6 import android.provider.MediaStore;  7 import android.support.v7.app.AppCompatActivity;  8 import android.os.Bundle;  9 import android.util.Log; 10 import android.view.View; 11 import android.widget.ImageView; 12 import android.widget.Toast; 13  14 import java.io.ByteArrayInputStream; 15 import java.io.ByteArrayOutputStream; 16 import java.io.File; 17  18 public class MainActivity extends AppCompatActivity implements View.OnClickListener { 19  20     private static final int REQUESTCODE = 100,REQUESTCODE_VIDEO = 200; 21     private View take_photo; 22     private View take_video; 23     private ImageView show_image; 24     private File mImageFile; 25  26     @Override 27     protected void onCreate(Bundle savedInstanceState) { 28         super.onCreate(savedInstanceState); 29         setContentView(R.layout.activity_main); 30         show_image = (ImageView) findViewById(R.id.show_image); 31         take_photo = findViewById(R.id.take_photo); 32         take_video = findViewById(R.id.take_video); 33  34         take_photo.setOnClickListener(this); 35         take_video.setOnClickListener(this); 36     } 37  38     @Override 39     public void onClick(View v) { 40         switch (v.getId()) { 41             case R.id.take_photo: 42                 Intent intent_img = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 43                 //建立File檔案 告訴照相機 儲存位置 44                 mImageFile = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/" + System.currentTimeMillis() + ".jpg"); 45                 //設定拍照朝向 46                 intent_img.putExtra(MediaStore.Images.Media.ORIENTATION, 0); 47                 //告知意圖 我們的拍照儲存位置 48                 intent_img.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mImageFile)); 49                 //開啟拍照 50                 startActivityForResult(intent_img, REQUESTCODE); 51                 break; 52             case R.id.take_video: 53                 Intent intent_video = new Intent(MediaStore.ACTION_VIDEO_CAPTURE); 54  55                 File mVideoFile = new File(Environment.getExternalStorageDirectory().getAbsoluteFile()+"/"+System.currentTimeMillis()+".mp4"); 56                 //告知意圖 我們的拍照儲存位置 57                 intent_video.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mVideoFile)); 58                 //設定視頻拍攝時常 59                 intent_video.putExtra(MediaStore.EXTRA_DURATION_LIMIT,10); 60                 //設定視頻儲存最大值 61                 intent_video.putExtra(MediaStore.EXTRA_SIZE_LIMIT,1024*1024*10); 62                 //設定視頻品質 63 //                intent_video.putExtra(MediaStore.EXTRA_VIDEO_QUALITY,50); 64  65                 startActivityForResult(intent_video, REQUESTCODE_VIDEO); 66                 break; 67         } 68     } 69  70     @Override 71     protected void onActivityResult(int requestCode, int resultCode, Intent data) { 72         super.onActivityResult(requestCode, resultCode, data); 73         if (REQUESTCODE == requestCode && resultCode == RESULT_OK) { 74             show_image.setImageBitmap(getimage(mImageFile.toString())); 75         } 76  77       /*  if(REQUESTCODE_VIDEO ==requestCode && requestCode == RESULT_OK){ 78             Uri resultData = data.getData(); 79             Log.i("result uri",resultData.toString()); 80             Toast.makeText(this,resultData.toString(),Toast.LENGTH_SHORT).show(); 81         }else{ 82             Toast.makeText(this,"what are you 弄啥捏",Toast.LENGTH_SHORT).show(); 83         }*/ 84     } 85  86     private Bitmap getimage(String srcPath) { 87         BitmapFactory.Options newOpts = new BitmapFactory.Options(); 88         //開始讀入圖片，此時把options.inJustDecodeBounds 設回true了 89         newOpts.inJustDecodeBounds = true; 90         Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);//此時返回bm為空白 91         newOpts.inJustDecodeBounds = false; 92         int w = newOpts.outWidth; 93         int h = newOpts.outHeight; 94         //現在主流手機比較多是800*480解析度，所以高和寬我們設定為 95         float hh = 800f;//這裡設定高度為800f 96         float ww = 480f;//這裡設定寬度為480f 97         //縮放比。由於是固定比例縮放，只用高或者寬其中一個資料進行計算即可 98         int be = 1;//be=1表示不縮放 99         if (w > h && w > ww) {//如果寬度大的話根據寬度固定大小縮放100             be = (int) (newOpts.outWidth / ww);101         } else if (w < h && h > hh) {//如果高度高的話根據寬度固定大小縮放102             be = (int) (newOpts.outHeight / hh);103         }104         if (be <= 0)105             be = 1;106         newOpts.inSampleSize = be;//設定縮放比例107         //重新讀入圖片，注意此時已經把options.inJustDecodeBounds 設回false了108         bitmap = BitmapFactory.decodeFile(srcPath, newOpts);109         return compressImage(bitmap);//壓縮好比例大小後再進行品質壓縮110     }111 112     private Bitmap compressImage(Bitmap image) {113         ByteArrayOutputStream baos = new ByteArrayOutputStream();114         image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//品質壓縮方法，這裡100表示不壓縮，把壓縮後的資料存放到baos中115         int options = 100;116         while (baos.toByteArray().length / 1024 > 100) {//迴圈判斷如果壓縮後圖片是否大於100kb,大於繼續壓縮117             baos.reset();//重設baos即清空baos118             image.compress(Bitmap.CompressFormat.JPEG, options, baos);//這裡壓縮options%，把壓縮後的資料存放到baos中119             options -= 10;//每次都減少10120         }121         ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把壓縮後的資料baos存放到ByteArrayInputStream中122         Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream資料產生圖片123         return bitmap;124     }125 }

 

其中加入了圖片壓縮，格式可以由開發人員自己定義

Android 相機與圖庫