android頭像設定：從本地照片庫或拍照擷取並剪裁

        功能介紹

        製作android應用時，使用者註冊的功能必不可少，往往還需要具備帳戶圖片的編輯功能，設定過程如：

        介面設計

        建立一個縮圖ImageView，點擊時，彈出設定頭像的對話方塊，設定完成後，重新整理縮圖；

<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="點擊設定頭像"            android:textColor="@android:color/black" />     </RelativeLayout></LinearLayout>

        Activity設計

        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 {/* 組件 */private RelativeLayout switchAvatar;private ImageView faceImage;private String[] items = new String[] { "選擇本地圖片", "拍照" };/* 頭像名稱 */private static final String IMAGE_FILE_NAME = "faceImage.jpg";/* 請求碼 */private static final int IMAGE_REQUEST_CODE = 0;private static final int CAMERA_REQUEST_CODE = 1;private static final int RESULT_REQUEST_CODE = 2;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE); // 去掉標題setContentView(R.layout.main);switchAvatar = (RelativeLayout) findViewById(R.id.switch_face_rl);faceImage = (ImageView) findViewById(R.id.face);// 設定事件監聽switchAvatar.setOnClickListener(listener);}private View.OnClickListener listener = new View.OnClickListener() {@Overridepublic void onClick(View v) {showDialog();}};/** * 顯示選擇對話方塊 */private void showDialog() {new AlertDialog.Builder(this).setTitle("設定頭像").setItems(items, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {switch (which) {case 0:Intent intentFromGallery = new Intent();intentFromGallery.setType("image/*"); // 設定檔案類型intentFromGallery.setAction(Intent.ACTION_GET_CONTENT);startActivityForResult(intentFromGallery,IMAGE_REQUEST_CODE);break;case 1:Intent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 判斷儲存卡是否可以用，可用進行儲存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() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}}).show();}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {//結果碼不等於取消時候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, "未找到儲存卡，無法儲存照片！",Toast.LENGTH_LONG).show();}break;case RESULT_REQUEST_CODE: //圖片縮放完成後if (data != null) {getImageToView(data);}break;}}super.onActivityResult(requestCode, resultCode, data);}/** * 裁剪圖片方法實現 *  * @param uri */public void startPhotoZoom(Uri uri) {Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");// 設定裁剪intent.putExtra("crop", "true");// aspectX aspectY 是寬高的比例intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);// outputX outputY 是裁剪圖片寬高intent.putExtra("outputX", 340);intent.putExtra("outputY", 340);intent.putExtra("return-data", true);startActivityForResult(intent, RESULT_REQUEST_CODE);}/** * 儲存裁剪之後的圖片資料 *  * @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 {/** * 檢查是否存在SDCard * @return */public static boolean hasSdcard(){String state = Environment.getExternalStorageState();if(state.equals(Environment.MEDIA_MOUNTED)){return true;}else{return false;}}}

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