Android实战简易教程-第二十七枪（Android设置头像上传功能实现）

在一般开发中上传图片作为头像的功能非常常见，下面我们研究下具体实现，代码很简单，大家可以直接拿来使用哦！

1.先看一下布局文件，很是丑陋：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/image_header"
        android:layout_width="150dp"
        android:layout_height="150dp" />

    <Button
        android:id="@+id/btn_selectimage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/image_header"
        android:text="相册" />

    <Button
        android:id="@+id/btn_takephoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_selectimage"
        android:text="拍照" />

</RelativeLayout>

2.MainActivity.java:

package com.example.userphoto;

import java.io.File;

import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
	private static final int IMAGE_REQUEST_CODE = 0;
	private static final int CAMERA_REQUEST_CODE = 1;
	private static final int RESIZE_REQUEST_CODE = 2;

	private static final String IMAGE_FILE_NAME = "header.jpg";

	private ImageView mImageHeader;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		setupViews();
	}

	private void setupViews() {
		mImageHeader = (ImageView) findViewById(R.id.image_header);
		final Button selectBtn1 = (Button) findViewById(R.id.btn_selectimage);
		final Button selectBtn2 = (Button) findViewById(R.id.btn_takephoto);
		selectBtn1.setOnClickListener(this);
		selectBtn2.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_selectimage:
			Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT);
			galleryIntent.addCategory(Intent.CATEGORY_OPENABLE);
			galleryIntent.setType("image/*");//图片
			startActivityForResult(galleryIntent, IMAGE_REQUEST_CODE);
			break;
		case R.id.btn_takephoto:
			if (isSdcardExisting()) {
				Intent cameraIntent = new Intent(
						"android.media.action.IMAGE_CAPTURE");//拍照
				cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());
				cameraIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
				startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
			} else {
				Toast.makeText(v.getContext(), "请插入sd卡", Toast.LENGTH_LONG)
						.show();
			}
			break;
		}
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (resultCode != RESULT_OK) {
			return;
		} else {
			switch (requestCode) {
			case IMAGE_REQUEST_CODE:
				resizeImage(data.getData());
				break;
			case CAMERA_REQUEST_CODE:
				if (isSdcardExisting()) {
					resizeImage(getImageUri());
				} else {
					Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！",
							Toast.LENGTH_LONG).show();
				}
				break;

			case RESIZE_REQUEST_CODE:
				if (data != null) {
					showResizeImage(data);
				}
				break;
			}
		}

		super.onActivityResult(requestCode, resultCode, data);
	}

	private boolean isSdcardExisting() {//判断SD卡是否存在
		final String state = Environment.getExternalStorageState();
		if (state.equals(Environment.MEDIA_MOUNTED)) {
			return true;
		} else {
			return false;
		}
	}

	public void resizeImage(Uri uri) {//重塑图片大小
		Intent intent = new Intent("com.android.camera.action.CROP");
		intent.setDataAndType(uri, "image/*");
		intent.putExtra("crop", "true");//可以裁剪
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1);
		intent.putExtra("outputX", 150);
		intent.putExtra("outputY", 150);
		intent.putExtra("return-data", true);
		startActivityForResult(intent, RESIZE_REQUEST_CODE);
	}

	private void showResizeImage(Intent data) {//显示图片
		Bundle extras = data.getExtras();
		if (extras != null) {
			Bitmap photo = extras.getParcelable("data");
			Drawable drawable = new BitmapDrawable(photo);
			mImageHeader.setImageDrawable(drawable);
		}
	}

	private Uri getImageUri() {//获取路径
		return Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
				IMAGE_FILE_NAME));
	}
}

3.运行实例就行了：

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