Android聊天软件的开发(五)--头像设置

头像设置主要有两种方式，从相册中选择照片，或直接拍照。选好照片后，都需要对照片进行裁剪，并且保存和显示。








1. 变量

private static final int ALBUM_RET_CODE = 1;
private static final int CAMERA_RET_CODE = 2;
private static final int FINISH_RET_CODE = 3;
private static final String PHOTO_NAME = "talking_photo.jpg";

2. 打开相册和拍照

/**打开相册*/
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");
//返回时将结果也返回
startActivityForResult(intent,ALBUM_RET_CODE);

/**拍照*/
// 判断存储卡是否可以用，可用进行存储
if (!hasSdCard()) {
	Toast.makeText(mContext,R.string.toast_sdcard_invalid,Toast.LENGTH_SHORT).show();
	return;
}
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(new File(Environment.getExternalStorageDirectory(),PHOTO_NAME)));
//返回时将结果也返回
startActivityForResult(intent,CAMERA_RET_CODE);

public static boolean hasSdCard() {
	String state = Environment.getExternalStorageState();
	if (state.equals(Environment.MEDIA_MOUNTED)) {
		return true;
	} else {
		return false;
	}
}

这两个操作需要在AndroidManifest.xml文件中添加SDK卡的读写权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

3. 将相册或拍照选中的照片进行裁剪

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if (resultCode != RESULT_CANCELED) {
		switch (requestCode) {
		// 从相册获取
		case ALBUM_RET_CODE:
			startPhotoZoom(data.getData());
			break;
		// 相机拍照
		case CAMERA_RET_CODE:
			File temp = new File(Environment.getExternalStorageDirectory()+ "/" + PHOTO_NAME);
			startPhotoZoom(Uri.fromFile(temp));
			break;
	}
	super.onActivityResult(requestCode, resultCode, data);
}

/**裁剪照片*/
public void startPhotoZoom(Uri uri) {
	Intent intent = new Intent("com.android.camera.action.CROP");
	intent.setDataAndType(uri, "image/*");
	// 下面这个crop=true是设置在开启的Intent中设置显示的view可裁剪
	intent.putExtra("crop", "true");
	// aspectX aspectY 是宽高的比例
	intent.putExtra("aspectX", 1);
	intent.putExtra("aspectY", 1);
	// outputX outputY 是裁剪图片宽高
	intent.putExtra("outputX", 150);
	intent.putExtra("outputY", 150);
	intent.putExtra("return-data", true);
	startActivityForResult(intent, FINISH_RET_CODE);
}

4. 将裁剪得到的图片进行保存或显示

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if (resultCode != RESULT_CANCELED) {
		switch (requestCode) {
		//...
		// 取得裁剪后的图片
		case FINISH_RET_CODE:
			/**
			 * 非空判断一定要验证
			 *如果不验证的话,在剪裁之后如果发现不满意，丢弃当前照片时，会报NullException
			 */
			if (data != null) {
				setPicToView(data);
			}
			break;
		}
	}
	super.onActivityResult(requestCode, resultCode, data);
}

private void setPicToView(Intent picdata) {
	Bundle extras = picdata.getExtras();
	if (extras != null) {
		Bitmap photo = extras.getParcelable("data");
		Drawable drawable = new BitmapDrawable(photo);
		mPhotoImage.setImageDrawable(drawable);
	}
}

这部分代码比较简单，不过还算比较常用，所以特地写出来。

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