android头像设置：从本地照片库或拍照获取并剪裁

功能介绍

***android应用时，用户注册的功能必不可少，往往还需要具备用户头像的编辑功能，设置过程如下图：



界面设计

建立一个缩略图ImageView，点击时，弹出设置头像的对话框，设置完成后，刷新缩略图；

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#F3F1DA"
    android:orientation="vertical" >

    <!-- title -->

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/title_bg"
        android:gravity="center"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/title_bar_txt"
            android:textColor="@android:color/white" />
    </LinearLayout>

    <!-- image switch -->

    <RelativeLayout
        android:id="@+id/switch_face_rl"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="20dip"
        android:background="@drawable/item_edit_bg"
        android:clickable="true" 
        android:padding="5dip" >

        <ImageView
            android:id="@+id/face"
            android:layout_width="42dip"
            android:layout_height="42dip"
            android:layout_alignParentLeft="true"
            android:layout_marginLeft="10dip"
            android:src="@drawable/mini_avatar" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dip"
            android:layout_marginTop="5dip"
            android:layout_toRightOf="@id/face"
            android:layout_gravity="center"
            android:text="点击设置头像"
            android:textColor="@android:color/black" /> 
    </RelativeLayout>

</LinearLayout>

Activity设计

MainActivity.java:

package com.xzw.picture;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

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.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;

/**
 * 
 * @author XuZhiwei (xuzw13@gmail.com) 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()) {
							   File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
							   File file = new File(path,IMAGE_FILE_NAME);
								intentFromCapture.putExtra(
										MediaStore.EXTRA_OUTPUT,
										Uri.fromFile(file));
							}

							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) {
		//结果码不等于取消时候
		if (resultCode != RESULT_CANCELED) {

			switch (requestCode) {
			case IMAGE_REQUEST_CODE:
				startPhotoZoom(data.getData());
				break;
			case CAMERA_REQUEST_CODE:
				if (Tools.hasSdcard()) {
				   File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
				   File tempFile = new File(path,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: //图片缩放完成后
				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", 340);
		intent.putExtra("outputY", 340);
		intent.putExtra("return-data", true);
		startActivityForResult(intent, RESULT_REQUEST_CODE);
	}

	/**
	 * 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(this.getResources(),photo);
			faceImage.setImageDrawable(drawable);
		}
	}

}

Tools.java

package com.xzw.utils;

import android.os.Environment;
/**
 * 
 * @author XuZhiwei (xuzw13@gmail.com)
 * 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;
		}
	}
}