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#7 #482 使用相机拍照 #1746

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merged 2 commits into from
May 4, 2019
Merged

#7 #482 使用相机拍照 #1746

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1178fb0
提交实验7代码
XieZehuai May 2, 2019
df8f831
提交实验7代码
XieZehuai May 2, 2019
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27 changes: 25 additions & 2 deletions students/com1714080901106/app/src/main/AndroidManifest.xml
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Expand Up @@ -2,7 +2,16 @@
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="edu.hzuapps.androidlabs.com1714080901106">

<!--获取网络权限-->
<uses-permission android:name="android.permission.INTERNET" />
<!--获取相机权限-->
<uses-feature
android:name="android.hardware.camera2"
android:required="false" />
<!--写入SD卡权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!--读取SD卡权限-->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application
android:allowBackup="true"
Expand All @@ -11,18 +20,32 @@
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<meta-data
android:name="com.google.android.actions"
android:resource="@xml/provider_paths" />

<activity
android:name="edu.hzuapps.androidlabs.dmc.Com1714080901106Activity01"
android:label="@string/app_name">
</activity>
android:label="@string/app_name"></activity>
<activity
android:name="edu.hzuapps.androidlabs.dmc.Activity_Login"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

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

<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
</application>

</manifest>
128 changes: 111 additions & 17 deletions ...4080901106/app/src/main/java/edu/hzuapps/androidlabs/com1714080901106/Activity_Login.java
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@@ -1,44 +1,51 @@
package edu.hzuapps.androidlabs.com1714080901106;

import android.Manifest;
import android.content.ContentUris;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.Build;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.support.annotation.RequiresApi;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.constraint.ConstraintLayout;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import edu.hzuapps.androidlabs.com1714080901106.R;

public class Activity_Login extends AppCompatActivity {
private EditText username;
private EditText password;
private Button login;
private Button register;
private Button dl_image;
private String name;
private String word;
private ConstraintLayout layout;
private EditText username;//用户名文本框
private EditText password;//密码文本框
private Button login;//登录按钮
private Button register;//注册按钮
private Button dl_image;//下载图片按钮
private Button take_photo;//拍照按钮
private Button choose_photo;//选择照片
private String name;//用户名
private String word;//密码
private ConstraintLayout layout;//主界面
private Uri imageUri;//图片路径
static final int TAKE_PHOTO = 1;//拍照请求
static final int CHOOSE_PHOTO = 2;//选择照片请求

@Override
protected void onCreate(Bundle savedInstanceState) {
Expand All @@ -50,6 +57,8 @@ protected void onCreate(Bundle savedInstanceState) {
login = findViewById(R.id.login);
register = findViewById(R.id.register);
dl_image = findViewById(R.id.download_image);
take_photo = findViewById(R.id.take_photos);
choose_photo = findViewById(R.id.choose_image);
layout = findViewById(R.id.background);

login.setOnClickListener(new View.OnClickListener() {//登录
Expand Down Expand Up @@ -90,10 +99,94 @@ public void onClick(View v) {
@Override
public void onClick(View v) {
showImage();
Toast.makeText(Activity_Login.this, "加载成功！", Toast.LENGTH_LONG).show();
}
});

take_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File outputImage = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), "photo.jpg");
try {//初始化图片
if (outputImage.exists()) {
outputImage.delete();
}
outputImage.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
imageUri = (Uri) FileProvider.getUriForFile(Activity_Login.this, getPackageName() + ".fileprovider", outputImage);
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_PHOTO);//打开相机
}
});

choose_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent, CHOOSE_PHOTO);//打开相册
}
});
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CHOOSE_PHOTO && resultCode == RESULT_OK)
handleImageOnKitKat(data);
}

private void handleImageOnKitKat(Intent data) {
String imagePath = null;
Uri uri = data.getData();//获取路径
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://downloads/public_downloads"),
Long.valueOf(docId));
imagePath = getImagePath(contentUri, null);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
imagePath = getImagePath(uri, null);
}
displayImage(imagePath);//设置背景图片
}

private String getImagePath(Uri uri, String selection) {//获取照片路径
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) {//将照片设置为背景图片
//获取运行时权限
if (ActivityCompat.checkSelfPermission(Activity_Login.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(Activity_Login.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
}

if (imagePath != null) {
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
layout.setBackground(new BitmapDrawable(getResources(), bitmap));
} else {
Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();
}
}

private void showImage() {
new Thread(new Runnable() {
@Override
Expand Down Expand Up @@ -127,6 +220,7 @@ private void show_image(final Bitmap bitmap) {
@Override
public void run() {
layout.setBackground(new BitmapDrawable(getResources(), bitmap));

}
});
}
Expand Down
27 changes: 22 additions & 5 deletions students/com1714080901106/app/src/main/res/layout/login.xml
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Expand Up @@ -17,13 +17,15 @@
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="178dp"
android:orientation="horizontal"/>
android:orientation="horizontal" />

<LinearLayout
android:layout_width="match_parent"
Expand Down Expand Up @@ -114,14 +116,29 @@
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
android:orientation="vertical"
android:gravity="bottom">

<Button
android:id="@+id/download_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="加载背景图片"
android:layout_gravity="bottom"/>
android:text="加载背景图片" />

<Button
android:id="@+id/take_photos"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="使用相机拍照"
android:layout_gravity="end"/>


<Button
android:id="@+id/choose_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="从相册选择背景图片" />

</LinearLayout>


Expand Down
4 changes: 4 additions & 0 deletions students/com1714080901106/app/src/main/res/xml/provider_paths.xml
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@@ -0,0 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>