在android的开发过程中,经常遇到设置用户头像以及裁剪图像大小的功能。昨天我遇到了设置用户头像的功能,开始不知道怎么搞,在技术群里问也没人回 答,就研究了微信用户设置头像的功能,了解到用户设置图像的过程,就是两步点击设置头像,选择头像资源的来源,相册和相机两个来得到。
闲话说的有点多了,来说说技术点吧。其实也比较简单,就是通过Intent来启动相册或者相机就可以了。
看下效果图:
代码如下:
package com.xzw.picture; import java.io.File; import com.xzw.utils.Tools; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.view.View; import android.view.Window; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.Toast; /** * * @author XuZhiwei ([email protected]) * Create at 2012-8-17 上午10:14:40 */ public class MainActivity extends Activity { /*组件*/ private RelativeLayout switchAvatar; private ImageView faceImage; private String[] items = new String[] { "选择本地图片", "拍照" }; /*头像名称*/ private static final String IMAGE_FILE_NAME = "faceImage.jpg"; /* 请求码*/ private static final int IMAGE_REQUEST_CODE = 0; private static final int CAMERA_REQUEST_CODE = 1; private static final int RESULT_REQUEST_CODE = 2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); // 去掉标题 setContentView(R.layout.main); switchAvatar = (RelativeLayout) findViewById(R.id.switch_face_rl); faceImage = (ImageView) findViewById(R.id.face); //设置事件监听 switchAvatar.setOnClickListener(listener); } private View.OnClickListener listener = new View.OnClickListener() { @Override public void onClick(View v) { showDialog(); } }; /** * 显示选择对话框 */ private void showDialog() { new AlertDialog.Builder(this) .setTitle("设置头像") .setItems(items, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which) { case 0: Intent intentFromGallery = new Intent(); intentFromGallery.setType("image/*"); // 设置文件类型 intentFromGallery .setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(intentFromGallery, IMAGE_REQUEST_CODE); break; case 1: Intent intentFromCapture = new Intent( MediaStore.ACTION_IMAGE_CAPTURE); // 判断存储卡是否可以用,可用进行存储 if (Tools.hasSdcard()) { intentFromCapture.putExtra( MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment .getExternalStorageDirectory(), IMAGE_FILE_NAME))); } startActivityForResult(intentFromCapture, CAMERA_REQUEST_CODE); break; } } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }).show(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case IMAGE_REQUEST_CODE: startPhotoZoom(data.getData()); break; case CAMERA_REQUEST_CODE: if (Tools.hasSdcard()) { File tempFile = new File( Environment.getExternalStorageDirectory() + IMAGE_FILE_NAME); startPhotoZoom(Uri.fromFile(tempFile)); } else { Toast.makeText(MainActivity.this, "未找到存储卡,无法存储照片!", Toast.LENGTH_LONG).show(); } break; case RESULT_REQUEST_CODE: if (data != null) { getImageToView(data); } break; } super.onActivityResult(requestCode, resultCode, data); } /** * 裁剪图片方法实现 * * @param uri */ public void startPhotoZoom(Uri uri) { Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); // 设置裁剪 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", 320); intent.putExtra("outputY", 320); intent.putExtra("return-data", true); startActivityForResult(intent, 2); } /** * 保存裁剪之后的图片数据 * * @param picdata */ private void getImageToView(Intent data) { Bundle extras = data.getExtras(); if (extras != null) { Bitmap photo = extras.getParcelable("data"); Drawable drawable = new BitmapDrawable(photo); faceImage.setImageDrawable(drawable); } } }
还有一个工具类:
package com.xzw.utils; import android.os.Environment; /** * * @author XuZhiwei ([email protected]) * Create at 2012-8-17 上午10:14:40 */ public class Tools { /** * 检查是否存在SDCard * @return */ public static boolean hasSdcard(){ String state = Environment.getExternalStorageState(); if(state.equals(Environment.MEDIA_MOUNTED)){ return true; }else{ return false; } } }
以上就是实现的代码!
以上代码有个bug,及时你在点击选择图片的过程中,突然间不想设置头像了,点击返回会出现异常
那是因为你取消的过程中,没有返回任何值,就出现了NullPointEXcetpion的异常,所以我们需要判断一下用户是否取消了操作。
代码贴出关键代码如下:
//结果码不等于操作取消时候 if (resultCode != RESULT_CANCELED) { switch (requestCode) { .......... } }
时间: 2024-11-09 00:32:45