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[操作系统]andriod打开摄像头和打开相册


package com.example.yanlei.picture;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import java.io.File;import java.io.IOException;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.media.ExifInterface;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends AppCompatActivity {  private static final String tag = "MainActivity";  private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;  private static final int PICK_IMAGE_ACTIVITY_REQUEST_CODE = 200;  private ImageView imageView;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    imageView = (ImageView) this.findViewById(R.id.image_view);    Button button = (Button) this.findViewById(R.id.open_camera);    button.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        takePicture();      }    });    Button pickImageBtn = (Button) this.findViewById(R.id.pick_image);    pickImageBtn.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        openAlbum();      }    });  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.menu_main, menu);    return true;  }  @Override  public boolean onOptionsItemSelected(MenuItem item) {    // Handle action bar item clicks here. The action bar will    // automatically handle clicks on the Home/Up button, so long    // as you specify a parent activity in AndroidManifest.    int id = item.getItemId();    //noinspection SimplifiableIfStatement    if (id == R.id.action_settings) {      return true;    }    return super.onOptionsItemSelected(item);  }  private static String picFileFullName;  //拍照  public void takePicture(){    String state = Environment.getExternalStorageState();    if (state.equals(Environment.MEDIA_MOUNTED)) {      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);      File outDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);      if (!outDir.exists()) {        outDir.mkdirs();      }      File outFile = new File(outDir, System.currentTimeMillis() + ".jpg");      picFileFullName = outFile.getAbsolutePath();      intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(outFile));      intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);      startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);    } else{      Log.e(tag, "请确认已经插入SD卡");    }  }  //打开本地相册  public void openAlbum(){    Intent intent = new Intent();    intent.setType("image/*");    intent.setAction(Intent.ACTION_GET_CONTENT);    this.startActivityForResult(intent, PICK_IMAGE_ACTIVITY_REQUEST_CODE);  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    super.onActivityResult(requestCode, resultCode, data);    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {      if (resultCode == RESULT_OK) {        Log.e(tag, "获取图片成功,path="+picFileFullName);        toast("获取图片成功,path="+picFileFullName);        setImageView(picFileFullName);      } else if (resultCode == RESULT_CANCELED) {        // 用户取消了图像捕获      } else {        // 图像捕获失败,提示用户        Log.e(tag, "拍照失败");      }    } else if (requestCode == PICK_IMAGE_ACTIVITY_REQUEST_CODE) {      if (resultCode == RESULT_OK) {        Uri uri = data.getData();        if(uri != null){          String realPath = getRealPathFromURI(uri);          Log.e(tag, "获取图片成功,path="+realPath);          toast("获取图片成功,path="+realPath);          setImageView(realPath);        }else{          Log.e(tag, "从相册获取图片失败");        }      }    }  }  private void setImageView(String realPath){    Bitmap bmp = BitmapFactory.decodeFile(realPath);    int degree = readPictureDegree(realPath);    if(degree <= 0){      imageView.setImageBitmap(bmp);    }else{      Log.e(tag, "rotate:"+degree);      //创建操作图片是用的matrix对象      Matrix matrix=new Matrix();      //旋转图片动作      matrix.postRotate(degree);      //创建新图片      Bitmap resizedBitmap=Bitmap.createBitmap(bmp,0,0,bmp.getWidth(),bmp.getHeight(),matrix,true);      imageView.setImageBitmap(resizedBitmap);    }  }  /**   * This method is used to get real path of file from from uri<br/>   * http://stackoverflow.com/questions/11591825/how-to-get-image-path-just-captured-from-camera   *   * @param contentUri   * @return String   */  public String getRealPathFromURI(Uri contentUri){    try{      String[] proj = {MediaStore.Images.Media.DATA};      // Do not call Cursor.close() on a cursor obtained using this method,      // because the activity will do that for you at the appropriate time      Cursor cursor = this.managedQuery(contentUri, proj, null, null, null);      int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);      cursor.moveToFirst();      return cursor.getString(column_index);    }catch (Exception e){      return contentUri.getPath();    }  }  /**   * 读取照片exif信息中的旋转角度<br/>   * http://www.eoeandroid.com/thread-196978-1-1.html   *   * @param path 照片路径   * @return角度   */  public static int readPictureDegree(String path) {    int degree = 0;    try {      ExifInterface exifInterface = new ExifInterface(path);      int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);      switch (orientation) {        case ExifInterface.ORIENTATION_ROTATE_90:          degree = 90;          break;        case ExifInterface.ORIENTATION_ROTATE_180:          degree = 180;          break;        case ExifInterface.ORIENTATION_ROTATE_270:          degree = 270;          break;      }    } catch (IOException e) {      e.printStackTrace();    }    return degree;  }  public void toast(String msg){    Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();  }}

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical">  <Button    android:id="@+id/open_camera"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="打开摄像头"    />  <Button    android:id="@+id/pick_image"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="打开相册"    />  <ImageView    android:id="@+id/image_view"    android:layout_width="300dp"    android:layout_height="300dp"    android:scaleType="fitCenter"/></LinearLayout>