功能介绍
制作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；
[code lang="xml"]</code>
<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>
[/code]
Activity设计
MainActivity.java:
[code lang="java"]</code>
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);
}
}
}
[/code]
Tools.java
[code lang="java"]</code>
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;
}
}
}
[/code]
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