调用系统相机、相册、视频

调用系统相机

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.text.format.DateFormat;
import android.util.Log;
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.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    private Button button;
    private ImageView view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);
        view= (ImageView)findViewById(R.id.image);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent, 1);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            String sdStatus = Environment.getExternalStorageState();
            if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
                Log.i("TestFile",
                        "SD card is not avaiable/writeable right now.");
                return;
            }
            new DateFormat();
            String name = DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
            Toast.makeText(this, name, Toast.LENGTH_LONG).show();
            Bundle bundle = data.getExtras();
            Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式

            FileOutputStream b = null;
            File file = new File("/sdcard/Image/");
            file.mkdirs();// 创建文件夹
            String fileName = "/sdcard/Image/"+name;

            try {
                b = new FileOutputStream(fileName);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } finally {
                try {
                    b.flush();
                    b.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            try
            {
                view.setImageBitmap(bitmap);// 将图片显示在ImageView里
            }catch(Exception e)
            {
                Log.e("error", e.getMessage());
            }

        }
    }
}
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="de.hdodenhof.picture.MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="点击选择图片" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="250dp"
        android:layout_height="250dp" />
</LinearLayout>
<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

调用系统相册

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    //调用系统相册-选择图片
    private static final int IMAGE = 1;

    //所需权限
//    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void onClick(View v) {
        //调用相册
        Intent intent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, IMAGE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //获取图片路径
        if (requestCode == IMAGE && resultCode == Activity.RESULT_OK && data != null) {
            Uri selectedImage = data.getData();
            String[] filePathColumns = {MediaStore.Images.Media.DATA};
            Cursor c = getContentResolver().query(selectedImage, filePathColumns, null, null, null);
            c.moveToFirst();
            int columnIndex = c.getColumnIndex(filePathColumns[0]);
            String imagePath = c.getString(columnIndex);
            showImage(imagePath);
            c.close();
        }
    }

    //加载图片
    private void showImage(String imaePath) {
        Bitmap bm = BitmapUtils.getBitmap(imaePath, 400, 400);
//        Bitmap bm = BitmapFactory.decodeFile(imaePath);
        ((ImageView) findViewById(R.id.image)).setImageBitmap(bm);
    }
}
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="de.hdodenhof.photo.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="点击选择图片" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="250dp"
        android:layout_height="250dp" />

</LinearLayout>

选择系统相册还是相机工具类

需求：点击修改头像，弹出对话框提示选择相册还是相机，从而调用系统相册或相机

值得注意的是：从照片拍摄图像时，系统会默认压缩的很小，导致显示的图片失真；解决办法：得到拍摄的原图，保存，然后手动压缩到需要的尺寸，再显示

<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
import android.graphics.Bitmap;

/**
 * Created by Administrator on 2016/10/17.
 */
public class GetPhotoEntity {

    private Bitmap bitmap;
    private String imgUrl;

    public Bitmap getBitmap() {
        return bitmap;
    }

    public void setBitmap(Bitmap bitmap) {
        this.bitmap = bitmap;
    }

    public String getImgUrl() {
        return imgUrl;
    }

    public void setImgUrl(String imgUrl) {
        this.imgUrl = imgUrl;
    }
}
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.text.format.DateFormat;
import android.view.View;

import com.xuehu365.xuehu.model.Constant;
import com.xuehu365.xuehu.model.GetPhotoEntity;
import com.xuehu365.xuehu.ui.widget.AlertDialog;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.Locale;

/**
 * Created by Administrator on 2016/10/15.
 */
public class GetPhotoUtils {

    //相片来源类型
    public static String touxiangType;
    public static String imageName;

    /**
     * 弹出选择相片来源对话框
     */
    public static void showDialog(final Context context) {
        AlertDialog alertDialog = new AlertDialog(context).builder();
        alertDialog.setTitle("选择相片来源").setPositiveButton("相册", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用相册
                touxiangType = Constant.picture;
                Intent intent = new Intent(Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                ((Activity) context).startActivityForResult(intent, Constant.IMAGE);
            }
        }).setNegativeButton("去照相", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用照相机
                touxiangType = Constant.photo;
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
                imageName = getPhotopath();
                File file = new File("/sdcard/Image/");
                file.mkdirs();
                String fileName = "/sdcard/Image/" + imageName;
                LogHelp.i("image", "printIn:" + fileName);
                File out = new File(fileName);
                Uri uri = Uri.fromFile(out);
                // 获取拍照后未压缩的原图片，并保存在uri路径中
                intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
                ((Activity) context).startActivityForResult(intent, Constant.IMAGE);
            }
        }).show();
    }

    /**
     * 获取原图片名称
     *
     * @return
     */
    public static String getPhotopath() {
        new DateFormat();
        String name = DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
        return name;
    }

    /**
     * 回调加载图片
     */
    public static GetPhotoEntity setBitmap(int resultCode, Intent data, Context context) {
        GetPhotoEntity entity = new GetPhotoEntity();
        //判断是来自相册还是相机
        if (touxiangType.equals(Constant.photo)) {
            if (resultCode == Activity.RESULT_OK) {
                String sdStatus = Environment.getExternalStorageState();
                if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
                    return null;
                }
//                Bundle bundle = data.getExtras();
//                Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式
                FileOutputStream b = null;
                File file = new File("/sdcard/Image/");
                file.mkdirs();// 创建文件夹
                String fileName = "/sdcard/Image/" + imageName;
                LogHelp.i("image", "printOut:" + fileName);
                Bitmap bitmap = BitmapUtils.getBitmap(fileName, 1280, 720);
                try {
                    b = new FileOutputStream(fileName);
                    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } finally {
                    try {
                        b.flush();
                        b.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                entity.setBitmap(bitmap);
                entity.setImgUrl(fileName);
                return entity;
            }
        } else if (touxiangType.equals(Constant.picture)) {
            //获取图片路径
            if (/*requestCode == Constant.IMAGE && */resultCode == Activity.RESULT_OK/* && data != null*/) {
                Uri selectedImage = data.getData();
                String[] filePathColumns = {MediaStore.Images.Media.DATA};
                Cursor c = context.getContentResolver().query(selectedImage, filePathColumns, null, null, null);
                c.moveToFirst();
                int columnIndex = c.getColumnIndex(filePathColumns[0]);
                String imagePath = c.getString(columnIndex);
                Bitmap bitmap = BitmapUtils.getBitmap(imagePath, 240, 240);
                c.close();
                entity.setBitmap(bitmap);
                entity.setImgUrl(imagePath);
                return entity;
            }
        }
        return null;
    }
}

调用系统视频

private void chooseVideo() {
    Intent intent = new Intent();
    /* 开启Pictures画面Type设定为image */
    //intent.setType("image/*");
    // intent.setType("audio/*"); //选择音频
//        intent.setType("video/*"); //选择视频 （mp4 3gp 是android支持的视频格式）

     intent.setType("video/*;image/*");//同时选择视频和图片

    /* 使用Intent.ACTION_GET_CONTENT这个Action */
    intent.setAction(Intent.ACTION_GET_CONTENT);
    /* 取得相片后返回本画面 */
    startActivityForResult(intent, 1);
}
@Override  
protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    // 选取图片的返回值  
    if (requestCode == 1) {  
        //  
        if (resultCode == RESULT_OK) {  
            Uri uri = data.getData();  
            Cursor cursor = getContentResolver().query(uri, null, null,  
                    null, null);  
            cursor.moveToFirst();  
            // String imgNo = cursor.getString(0); // 图片编号  
            String v_path = cursor.getString(1); // 图片文件路径  
            String v_size = cursor.getString(2); // 图片大小  
            String v_name = cursor.getString(3); // 图片文件名  
            LogUtil.e("v_path="+v_path);  
            LogUtil.e("v_size="+v_size);  
            LogUtil.e("v_name="+v_name);  
        }  
    }  
    super.onActivityResult(requestCode, resultCode, data);  
}  
//拿到视频第一帧
MediaMetadataRetriever mmr = new MediaMetadataRetriever();
mmr.setDataSource(videoPath);
Bitmap bitmap = mmr.getFrameAtTime();
video_layout.setImageBitmap(bitmap);
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原文地址：https://www.cnblogs.com/anni-qianqian/p/5965201.html