Android扩展

1.调用系统摄像头

  1.声明常量和变量

  2.按钮点击事件，打开系统摄像头

  3.重写onActivityResult事件接收拍照返回

  4.生成文件名返回路径

  5.保存图片

private static final int TAKE_PICTURE = 1;

class btnGotoActivity02Listener implements OnClickListener {
  public void onClick(View v) {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //调用摄像头拍照
    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是照片质量，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，保存下来的图片仅为原图的1/4大小，如果需要保存大照片则需要使用下面的方式

  缺点：此方法除了在指定的目录下保存图片外，在系统拍照路径下也会保存下一张相同的图片。

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); //调用摄像头拍照
    intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(TEMP_FILE))); //另存图片地址
    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, "图片已保存在：" + filename, 3000).show();
      }
      else {
        Toast.makeText(MainActivity.this, "亲，我实在无能为力啊，你是用啥程序照的相片？", 5000).show();
      }
    }
  } catch (Exception err) {
    Log.e("Exception", err.getLocalizedMessage());
  }
}