Android调用系统相机

时间：2023-02-07 20:31:10

简述：

  Android开发中会经常遇到调用系统相机功能的场景，今天总结一下Camera的基本使用。

                                                    Android调用系统相机

技术点：

    1、首先要考虑权限问题，Android6.0以上的系统需要动态申请权限，实现方式如下：

    /**
     * 方法描述：针对Android 6.0以上系统的动态权限申请
     */
    private void requestCameraPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CODE);
            return;
        }

        launchCamera();
    }

    2、其次通过重写onRequestPermissionsResult（）方法处理权限申请结果。

        

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (MY_PERMISSIONS_REQUEST_CODE == requestCode) {
            //循环遍历已经申请到的权限
            for (int index = 0; index < permissions.length; index++) {
                switch (permissions[index]) {
                    case Manifest.permission.CAMERA:
                        //用户授权
                        if (PackageManager.PERMISSION_GRANTED == grantResults[index]) {
                            launchCamera();
                        } else if (PackageManager.PERMISSION_DENIED == grantResults[index]) {
                            Toast.makeText(CameraActivity.this, "应用没有拍照权限，请授权！", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(CameraActivity.this, "应用没有拍照权限，请授权", Toast.LENGTH_SHORT).show();
                        }
                        break;
                }

            }

        }
    }

3、其次是系统相机的调用及其拍照结果的回调。

    /**
     * 方法描述：启动系统相机
     */
    private void launchCamera() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, REQUEST_CODE);
    }
    至于结果回调还是重写onActivityResult()方法。 

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            Intent intent = new Intent(CameraActivity.this, PhotoShowActivity.class);
            intent.putExtra("picture", data.getExtras());
            startActivity(intent);
        } else {
            launchCamera();
        }
    }

代码实现：

 CameraActivity代码：

package com.lizhenya.systemcamera;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.Window;
import android.widget.Toast;

public class CameraActivity extends Activity {
    private static final int REQUEST_CODE = 1;
    private static final int MY_PERMISSIONS_REQUEST_CODE = 2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        requestCameraPermission();
    }


    /**
     * 方法描述：启动系统相机
     */
    private void launchCamera() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, REQUEST_CODE);
    }

    /**
     * 方法描述：针对Android 6.0以上系统的动态权限申请
     */
    private void requestCameraPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CODE);
            return;
        }

        launchCamera();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            Intent intent = new Intent(CameraActivity.this, PhotoShowActivity.class);
            intent.putExtra("picture", data.getExtras());
            startActivity(intent);
        } else {
            launchCamera();
        }
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (MY_PERMISSIONS_REQUEST_CODE == requestCode) {
            //循环遍历已经申请到的权限
            for (int index = 0; index < permissions.length; index++) {
                switch (permissions[index]) {
                    case Manifest.permission.CAMERA:
                        if (PackageManager.PERMISSION_GRANTED == grantResults[index]) {
                            launchCamera();
                        } else if (PackageManager.PERMISSION_DENIED == grantResults[index]) {
                            Toast.makeText(CameraActivity.this, "应用没有拍照权限，请授权！", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(CameraActivity.this, "应用没有拍照权限，请授权", Toast.LENGTH_SHORT).show();
                        }
                        break;
                }

            }

        }
    }
}

PhotoShowActivity代码： 

/**
 * 类描述：
 * Created by lizhenya on 16/8/23.
 */
public class PhotoShowActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        final Intent intent = getIntent();
        final Bundle bundle = intent.getBundleExtra("picture");
        Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式
        ((ImageView)findViewById(R.id.iv)).setImageBitmap(bitmap);
    }
}

完整源码下载

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