netkiller.github.io/java/android/camera.activity.html at master · vsnotebook/netkiller.github.io · GitHub

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>44.3. Activity</title><link rel="stylesheet" type="text/css" href="..//docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="../index.html" title="Netkiller Java 手札" /><link rel="up" href="android.camera.html" title="第 44 章相机与相册" /><link rel="prev" href="camera.layout.html" title="44.2. layout" /><link rel="next" href="ledflashlight.html" title="44.4. LED flash 做手电筒" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> |

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<a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">44.3. Activity</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="camera.layout.html">上一页</a> </td><th width="60%" align="center">第 44 章相机与相册</th><td width="20%" align="right"> <a accesskey="n" href="ledflashlight.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="camera.activity"></a>44.3. Activity</h2></div></div></div>

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);

}

</pre>

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