利用 AS實現調用相機和錄製視頻的功能

需要的工具

Android Studio

具體實現的方法如下：

創建一個主的activity其中佈局代碼activity_main.xml的代碼如下：

<?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"
    tools:context="com.example.administrator.myapp.MainActivity">

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

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

MainActivity的代碼如下：

package com.example.administrator.myapp;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

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

public class MainActivity extends AppCompatActivity {

    public static final int TAKE_PHOTO = 1;

    private Button take_photo;

    private ImageView picture;

    private Uri imageUri;

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

        init();
    }

    private void init() {
        take_photo = (Button) findViewById(R.id.take_photo);
        picture = (ImageView) findViewById(R.id.picture);

        take_photo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                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.cameraalbumtest.fileprovider",outputImage);
                }else{
                    imageUri = Uri.fromFile(outputImage);
                }
                //啓動相機程序
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                startActivityForResult(intent,TAKE_PHOTO);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch(requestCode){
            case TAKE_PHOTO:
                if(resultCode == RESULT_OK){
                    try{
                        //將拍攝的照片顯示出來
                        Bitmap bitmap = BitmapFactory.decodeStream(getContent -
                                Resolver().openInputStream(imageUri));
                        picture.setImageBitmap(bitmap);
                    }catch (FileNotFoundException e){
                        e.printStackTrace();
                    }
                }
                break;
            default:
                break;
        }
    }
}

其中需要主要的是要添加配置文件。在res文件下新建一個xml的文件夾，在其中創建一個file_paths.xml文件，代碼如下：

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

最後在Android.MainFest.xml文件中添加相應的拍照的權限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

然後配置一個容器用於添加拍攝後的照片如下：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.administrator.myapp">
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <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.administrator.myapp.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"
                />
            ></provider>
    </application>

</manifest>

最後運行程序，就能實現拍照的功能啦，是不是很簡單啊，小夥伴