现在很多应用中都会要求用户上传一张图片来作为头像，首先我在这接收使用相机拍照和在相册中选择图片。接下来先上效果图：

接下来看代码：

1、布局文件：

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context="com.gyq.cameraalbumtest.MainActivity">

android:id="@+id/btn_take_photo"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="take photo"/>

android:id="@+id/choose_from_album"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="choose from album"/>

android:id="@+id/iv_picture"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"/>

2、MainActivity.java逻辑代码：

package com.gyq.cameraalbumtest;

import android.Manifest;

import android.annotation.TargetApi;

import android.content.ContentUris;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.database.Cursor;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.net.Uri;

import android.os.Build;

import android.os.Bundle;

import android.provider.DocumentsContract;

import android.provider.MediaStore;

import android.support.annotation.NonNull;

import android.support.v4.app.ActivityCompat;

import android.support.v4.content.ContextCompat;

import android.support.v4.content.FileProvider;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

import java.io.File;

public class MainActivity extends AppCompatActivity {

public static final int TAKE_PHOTO = 1;

public static final int CHOOSE_PHOTO = 2;

private Button mTakePhoto, mChoosePhoto;

private ImageView picture;

private Uri imageUri;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mTakePhoto = (Button) findViewById(R.id.btn_take_photo);

mChoosePhoto = (Button) findViewById(R.id.choose_from_album);

picture = (ImageView) findViewById(R.id.iv_picture);

mTakePhoto.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//创建file对象，用于存储拍照后的图片；

File outputImage = new File(getExternalCacheDir(), "output_image.jpg");

try {

if (outputImage.exists()) {

outputImage.delete();

}

outputImage.createNewFile();

} catch (Exception e) {

e.printStackTrace();

}

if (Build.VERSION.SDK_INT >= 24) {

imageUri = FileProvider.getUriForFile(MainActivity.this,

"com.gyq.cameraalbumtest.fileprovider", outputImage);

} else {

imageUri = Uri.fromFile(outputImage);

}

//启动相机程序

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");

intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);

startActivityForResult(intent, TAKE_PHOTO);

}

});

mChoosePhoto.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);

} else {

openAlbum();

}

}

});

}

//打开相册

private void openAlbum() {

Intent intent = new Intent("android.intent.action.GET_CONTENT");

intent.setType("image/*");

startActivityForResult(intent, CHOOSE_PHOTO);

}

@Override

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

switch (requestCode) {

case 1:

if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

openAlbum();

} else {

Toast.makeText(this, "you denied the permission", Toast.LENGTH_SHORT).show();

}

break;

}

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

switch (requestCode) {

case TAKE_PHOTO:

if (resultCode == RESULT_OK) {

try {

Bitmap bm = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));

picture.setImageBitmap(bm);

} catch (Exception e) {

e.printStackTrace();

}

}

break;

case CHOOSE_PHOTO:

if (resultCode == RESULT_OK) {

if (Build.VERSION.SDK_INT >= 19) { //4.4及以上的系统使用这个方法处理图片；

handleImageOnKitKat(data);

} else {

handleImageBeforeKitKat(data); //4.4及以下的系统使用这个方法处理图片

}

}

default:

break;

}

}

private void handleImageBeforeKitKat(Intent data) {

Uri uri = data.getData();

String imagePath = getImagePath(uri, null);

displayImage(imagePath);

}

private String getImagePath(Uri uri, String selection) {

String path = null;

//通过Uri和selection来获取真实的图片路径

Cursor cursor = getContentResolver().query(uri, null, selection, null, null);

if (cursor != null) {

if (cursor.moveToFirst()) {

path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));

}

cursor.close();

}

return path;

}

private void displayImage(String imagePath) {

if (imagePath != null) {

Bitmap bitmap = BitmapFactory.decodeFile(imagePath);

picture.setImageBitmap(bitmap);

} else {

Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();

}

}

/**

* 4.4及以上的系统使用这个方法处理图片

*

* @param data

*/

@TargetApi(19)

private void handleImageOnKitKat(Intent data) {

String imagePath = null;

Uri uri = data.getData();

if (DocumentsContract.isDocumentUri(this, uri)) {

//如果document类型的Uri,则通过document来处理

String docID = DocumentsContract.getDocumentId(uri);

if ("com.android.providers.media.documents".equals(uri.getAuthority())) {

String id = docID.split(":")[1]; //解析出数字格式的id

String selection = MediaStore.Images.Media._ID + "=" + id;

imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);

} else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {

Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/piblic_downloads"), Long.valueOf(docID));

imagePath = getImagePath(contentUri, null);

}

} else if ("content".equalsIgnoreCase(uri.getScheme())) {

//如果是content类型的uri，则使用普通方式使用

imagePath = getImagePath(uri, null);

} else if ("file".equalsIgnoreCase(uri.getScheme())) {

//如果是file类型的uri，直接获取路径即可

imagePath = uri.getPath();

}

displayImage(imagePath);

}

}

3、清单文件：

package="com.gyq.cameraalbumtest">

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:supportsRtl="true"

android:theme="@style/AppTheme">

android:authorities="com.gyq.cameraalbumtest.fileprovider"

android:name="android.support.v4.content.FileProvider"

android:exported="false"

android:grantUriPermissions="true">

android:resource="@xml/file_paths"/>

4、xml文件夹中的文件

OK，完成收工。请继续关注我的博客。谢谢！

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