Android 调用摄像头拍照或者相册图片设置头像Demo

该文章来源第一行代码+ Android

里面有自己想要的东西就写出来了，大家要是有用得着的也比较方便直接复制代码。

1.布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.lisineng.cameraalbumtest.MainActivity">

    <Button
        android:id="@+id/take_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Take Photo"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/choose_from_album"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAllCaps="false"
        android:text="Choose from Album"/>

    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"/>
</LinearLayout>

2.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.lisineng.cameraalbumtest">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <provider
            android:authorities="com.example.lisineng.cameraalbumtest.fileprovider"
            android:name="android.support.v4.content.FileProvider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths">
            </meta-data>
        </provider>
    </application>

</manifest>

3.file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
    <paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="my_images" path=""></external-path>
</paths>

4.MainActivity.java

package com.example.lisineng.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.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.v4.graphics.BitmapCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {
    private static final int TAKE_PHOTO = 1;
    private static final int CHOOSE_PHOTO = 2;
    private ImageView picture;
    private Uri imageUri;

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

        Button takePhoto = (Button)findViewById(R.id.take_photo);
        picture = (ImageView)findViewById(R.id.picture);
        takePhoto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //1.创建File对象，用于存储存储拍照后的图片
                File outputImage = new File(getExternalCacheDir(),"output_image.jpg");
                try{
                    if(outputImage.exists()){
                        outputImage.delete();
                    }
                    outputImage.createNewFile();
                }catch (IOException e){
                    e.printStackTrace();
                }

                if(Build.VERSION.SDK_INT >= 24){
                    imageUri = FileProvider.getUriForFile(MainActivity.this,
                            "com.example.lisineng.cameraalbumtest.fileprovider",outputImage);
                } else {
                    imageUri = Uri.fromFile(outputImage);
                }

                //2.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);
            }
        });

        Button chooseFromAlbum = (Button)findViewById(R.id.choose_from_album);
        chooseFromAlbum.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();
                }
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode){
            case TAKE_PHOTO:
                if(resultCode == RESULT_OK){
                    try{

                        //3.将拍摄的照片显示出来
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                        picture.setImageBitmap(bitmap);

                    }catch (FileNotFoundException e){

                    }
                }
                break;
            case CHOOSE_PHOTO:
                if(resultCode == RESULT_OK){
                    if(Build.VERSION.SDK_INT >=19){
                        handleImageOnKitKat(data);
                    } else {
                        handleImageBeforeKitkat(data);
                    }
                }
                break;
            default:
        }
    }

    private void openAlbum(){
        Intent intent = new Intent("android.intent.action.GET_CONTENT");
        intent.setType("image/*");
        startActivityForResult(intent,CHOOSE_PHOTO);
    }
    @TargetApi(19)
    private void handleImageOnKitKat(Intent data){
        String imagePath = null;
        Uri uri = data.getData();
        if(DocumentsContract.isDocumentUri(this,uri)){
            String docId = DocumentsContract.getDocumentId(uri);
            if("com.android.providers.media.documents".equals(uri.getAuthority())){
                String id = docId.split(":")[1];
                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://download/public_downloads"),
                        Long.valueOf(docId));
                imagePath = getImagePath(contentUri,null);
            }else if("content".equalsIgnoreCase(uri.getScheme())){
                imagePath = getImagePath(uri,null);
            } else if("file".equalsIgnoreCase(uri.getScheme())){
                imagePath = uri.getPath();
            }

            displayImage(imagePath);
        }
    }


    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;
        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();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode){
            case 1:
                if(grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    openAlbum();
                } else {
                    Toast.makeText(this,"You denied some permission",Toast.LENGTH_SHORT).show();
                }
                break;
            default:
        }
    }

运行结果