android 相册管理开发,Android 相机与相册开发-优快云博客

本文节选自《Netkiller Java 手札》

Netkiller Java 手札

Mr. Neo Chan, 陈景峯(BG7NYT)

中国广东省深圳市望海路半岛城邦三期 518067 +86 13113668890

$Id: book.xml 606 2013-05-29 09:52:58Z netkiller $

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第 39 章相机与相册

39.1. manifest 文件

package="cn.netkiller.camera">

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:roundIcon="@mipmap/ic_launcher_round"

android:supportsRtl="true"

android:theme="@style/AppTheme">

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

android:authorities="cn.netkiller.camera.provider"

android:exported="false"

android:grantUriPermissions="true">

android:name="android.support.FILE_PROVIDER_PATHS"

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

provider_paths.xml 文件

39.2. layout

xmlns:app="http://schemas.android.com/apk/res-auto"

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

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Hello World!"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

android:id="@+id/buttonOpenCamera"

android:layout_width="160dp"

android:layout_height="wrap_content"

android:layout_marginStart="8dp"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginBottom="8dp"

android:text="拍照立即显示"

app:layout_constraintBottom_toTopOf="@+id/buttonAlbum"

app:layout_constraintEnd_toStartOf="@+id/buttonSavePhoto"

app:layout_constraintHorizontal_bias="0.283"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/imageViewPicture"

app:layout_constraintVertical_bias="0.0" />

android:id="@+id/buttonSavePhoto"

android:layout_width="160dp"

android:layout_height="wrap_content"

android:layout_marginTop="8dp"

android:layout_marginEnd="20dp"

android:layout_marginBottom="8dp"

android:text="拍照存储后显示"

app:layout_constraintBottom_toTopOf="@+id/buttonAlbum"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintTop_toBottomOf="@+id/imageViewPicture"

app:layout_constraintVertical_bias="0.0" />

android:id="@+id/imageViewPicture"

android:layout_width="338dp"

android:layout_height="366dp"

android:layout_centerHorizontal="true"

android:layout_marginStart="8dp"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/textView" />

android:id="@+id/buttonAlbum"

android:layout_width="352dp"

android:layout_height="wrap_content"

android:layout_marginStart="8dp"

android:layout_marginEnd="8dp"

android:layout_marginBottom="8dp"

android:text="Album"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent" />

39.3. Activity

package cn.netkiller.camera;

import android.Manifest;

import android.content.ContentResolver;

import android.content.ContentValues;

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.Environment;

import android.os.StrictMode;

import android.provider.MediaStore;

import android.support.v4.app.ActivityCompat;

import android.support.v4.content.FileProvider;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private ImageView imageViewPicture;

private Button buttonOpenCamera;

private Button buttonSavePhoto;

private Button buttonAlbum;

private static int REQUEST_CAMERA = 1;

private static int REQUEST_PHOTO = 2;

private static int REQUEST_ALBUM = 3;

private File imageFile;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

imageViewPicture = (ImageView) findViewById(R.id.imageViewPicture);

buttonOpenCamera = (Button) findViewById(R.id.buttonOpenCamera);

buttonSavePhoto = (Button) findViewById(R.id.buttonSavePhoto);

buttonAlbum = (Button) findViewById(R.id.buttonAlbum);

buttonOpenCamera.setOnClickListener(this);

buttonSavePhoto.setOnClickListener(this);

buttonAlbum.setOnClickListener(this);

StrictMode.VmPolicy.Builder newbuilder = new StrictMode.VmPolicy.Builder();

StrictMode.setVmPolicy(newbuilder.build());

}

@Override

public void onClick(View view) {

Intent intent;

switch (view.getId()) {

case R.id.buttonOpenCamera:

// 拍照并显示图片

intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 启动系统相机

startActivityForResult(intent, REQUEST_CAMERA);

break;

case R.id.buttonSavePhoto:

if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

TextView textView = (TextView) findViewById(R.id.textView);

textView.setText("SD 卡不存在，请插入 SD 卡！");

}

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

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

return;

} else {

String dir = Environment.getExternalStorageDirectory().getPath();

new File(dir).mkdirs();

imageFile = new File(dir, "tmp.png");

Uri imageUri = FileProvider.getUriForFile(MainActivity.this, "cn.netkiller.camera.provider", imageFile);

Log.d("album", imageFile.getPath());

intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 启动系统相机

intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);

startActivityForResult(intent, REQUEST_PHOTO);

}

break;

case R.id.buttonAlbum:

intent = new Intent(Intent.ACTION_GET_CONTENT);

intent.setType("image/*");

startActivityForResult(Intent.createChooser(intent, "Select Picture"), 3);

break;

default:

break;

}

@Override

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

super.onActivityResult(requestCode, resultCode, data);

if (resultCode == RESULT_OK) { // 如果返回数据

if (requestCode == REQUEST_CAMERA) { // 判断请求码是否为REQUEST_CAMERA,如果是代表是这个页面传过去的，需要进行获取

Bundle bundle = data.getExtras(); // 从data中取出传递回来缩略图的信息，图片质量差，适合传递小图片

Bitmap bitmap = (Bitmap) bundle.get("data"); // 将data中的信息流解析为Bitmap类型

imageViewPicture.setImageBitmap(bitmap);// 显示图片

} else if (requestCode == REQUEST_PHOTO) {

Log.i("photo", imageFile.getPath());

try {

// InputStream inputStream = getContentResolver().openInputStream(imageUri);

String dir = Environment.getExternalStorageDirectory().getPath();

FileInputStream fileInputStream = new FileInputStream(imageFile);

Bitmap bitmap = BitmapFactory.decodeStream(fileInputStream);

fileInputStream.close();

imageViewPicture.setImageBitmap(bitmap);// 显示图片

} catch (Exception e) {

e.printStackTrace();

}

} else if (requestCode == REQUEST_ALBUM) {

Bitmap bitmap = null;

//外界的程序访问ContentProvider所提供数据可以通过ContentResolver接口

ContentResolver resolver = getContentResolver();

Uri originalUri = data.getData(); //获得图片的uri

try {

bitmap = MediaStore.Images.Media.getBitmap(resolver, originalUri); //显得到bitmap图片

} catch (IOException e) {

e.printStackTrace();

}

//获取图片的路径：

Log.i("album", String.valueOf(originalUri));

imageViewPicture.setImageBitmap(bitmap);

}