Android擴展 - 拍照篇（Camera）

1.調用系統攝像頭

  1.聲明常量和變量

  2.按鈕點擊事件，打開系統攝像頭

  3.重寫onActivityResult事件接收拍照返回

  4.生成文件名返回路徑

  5.保存圖片

 

  private static final int TAKE_PICTURE = 1;

  class btnGotoActivity02Listener implements OnClickListener {
    public void onClick(View v) {
      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //調用攝像頭拍照
      startActivityForResult(intent, TAKE_PICTURE);
    }
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    String filename = "";
    try {
      if (resultCode == Activity.RESULT_OK && requestCode == TAKE_PICTURE) {
        Bundle bundle = data.getExtras();
        Bitmap bmp = (Bitmap)bundle.get("data");
        filename = saveImage(bmp);
      }
    } catch (Exception err) {
      Log.e("Exception", err.getLocalizedMessage());
    }
  }

  public String buildFileName(){
    Date now = new Date();
    SimpleDateFormat formater = new SimpleDateFormat("yyMMdd_HHmmss");

    String SDCARD = Environment.getExternalStorageDirectory() + "/";
    String basePath = SDCARD + "dier/photo/";

    File dir = new File(basePath);
    dir.mkdirs();
    
    return basePath + formater.format(now) + ".jpg";
  }
  
  public String saveImage(Bitmap bmp) throws Exception {
    File file = new File(buildFileName());
    file.createNewFile();
    FileOutputStream oStream = new FileOutputStream(file);
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, oStream); //100是照片質量，0-100，越大越好
    oStream.flush();
    oStream.close();
    return file.getPath();
  }

 
2.保存完整分辨率的照片

  使用上面的方法，保存下來的圖片僅爲原圖的1/4大小，如果需要保存大照片則需要使用下面的方式

  缺點：此方法除了在指定的目錄下保存圖片外，在系統拍照路徑下也會保存下一張相同的圖片。

  private static final int TAKE_PICTURE = 1;
  private String TEMP_FILE = "";
  
  class btnGotoActivity02Listener implements OnClickListener {
    public void onClick(View v) {
      TEMP_FILE = buildFileName();
      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //調用攝像頭拍照
      intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(TEMP_FILE))); //另存圖片地址
      startActivityForResult(intent, TAKE_PICTURE);
    }
  }
  
  public String buildFileName(){
    Date now = new Date();
    SimpleDateFormat formater = new SimpleDateFormat("yyMMdd_HHmmss");

    String SDCARD = Environment.getExternalStorageDirectory() + "/";
    String basePath = SDCARD + "dier/photo/";

    File dir = new File(basePath);
    dir.mkdirs();
    
    return basePath + formater.format(now) + ".jpg";
  }
  
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    String filename = "";
    try {
      if (resultCode == Activity.RESULT_OK && requestCode == TAKE_PICTURE) {
        File file = new File(TEMP_FILE);
        if(file.exists()){
          filename = file.getPath();
          Toast.makeText(MainActivity.this, "圖片已保存在：" + filename, 3000).show();
        }
        else {
          Toast.makeText(MainActivity.this, "親，我實在無能爲力啊，你是用啥程序照的相片？", 5000).show();
        }
      }
    } catch (Exception err) {
      Log.e("Exception", err.getLocalizedMessage());
    }
  }