Android 相机与图库

  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                 //创建File文件 告诉照相机 存储位置
 44                 mImageFile = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/" + System.currentTimeMillis() + ".jpg");
 45                 //设置拍照朝向
 46                 intent_img.putExtra(MediaStore.Images.Media.ORIENTATION, 0);
 47                 //告知意图 我们的拍照存储位置
 48                 intent_img.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mImageFile));
 49                 //开启拍照
 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                 //告知意图 我们的拍照存储位置
 57                 intent_video.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mVideoFile));
 58                 //设置视频拍摄时常
 59                 intent_video.putExtra(MediaStore.EXTRA_DURATION_LIMIT,10);
 60                 //设置视频存储最大值
 61                 intent_video.putExtra(MediaStore.EXTRA_SIZE_LIMIT,1024*1024*10);
 62                 //设置视频质量
 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         //开始读入图片，此时把options.inJustDecodeBounds 设回true了
 89         newOpts.inJustDecodeBounds = true;
 90         Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);//此时返回bm为空
 91         newOpts.inJustDecodeBounds = false;
 92         int w = newOpts.outWidth;
 93         int h = newOpts.outHeight;
 94         //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
 95         float hh = 800f;//这里设置高度为800f
 96         float ww = 480f;//这里设置宽度为480f
 97         //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
 98         int be = 1;//be=1表示不缩放
 99         if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
100             be = (int) (newOpts.outWidth / ww);
101         } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
102             be = (int) (newOpts.outHeight / hh);
103         }
104         if (be <= 0)
105             be = 1;
106         newOpts.inSampleSize = be;//设置缩放比例
107         //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
108         bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
109         return compressImage(bitmap);//压缩好比例大小后再进行质量压缩
110     }
111
112     private Bitmap compressImage(Bitmap image) {
113         ByteArrayOutputStream baos = new ByteArrayOutputStream();
114         image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
115         int options = 100;
116         while (baos.toByteArray().length / 1024 > 100) {//循环判断如果压缩后图片是否大于100kb,大于继续压缩
117             baos.reset();//重置baos即清空baos
118             image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
119             options -= 10;//每次都减少10
120         }
121         ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
122         Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
123         return bitmap;
124     }
125 }

其中加入了图片压缩，格式可以由开发者自己定义