一、概述本章节主要讲述的Android相机Camera的相关知识点，主要包含三个方面，Android启动系统相机生成缩略图、Android启动系统相机生成原图以及Android自定义相机等。

二、Android启动系统相机

核心代码：

package com.czhappy.camerademo.activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.provider.MediaStore;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.ImageView;

import com.czhappy.camerademo.R;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

private static int REQ_1 = 1;

private static int REQ_2 = 2;

private ImageView image_iv;

private String mFilePath;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

mFilePath = Environment.getExternalStorageDirectory().getPath();

mFilePath = mFilePath +"/" + System.currentTimeMillis()+".jpg";

}

public void startCamera1(View view){

//隐式Intent调用

Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

startActivityForResult(it, REQ_1);

}

public void startCamera2(View view){

//隐式Intent调用

Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

Uri photoUri = Uri.fromFile(new File(mFilePath));

it.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);

startActivityForResult(it, REQ_2);

}

public void customCamera(View view){

Intent it = new Intent(MainActivity.this, CustomCameraActivity.class);

startActivity(it);

}

/**

*

* @param requestCode

* @param resultCode

* @param data //缩略图

*/

@Override

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

super.onActivityResult(requestCode, resultCode, data);

if(resultCode == RESULT_OK){

if(requestCode == REQ_1){//缩略图

Bundle bundle = data.getExtras();

Bitmap bmp = (Bitmap) bundle.get("data");

image_iv.setImageBitmap(bmp);

}else if(requestCode == REQ_2){//原图

FileInputStream fis = null;

try {

fis = new FileInputStream(mFilePath);

Bitmap bitmap = BitmapFactory.decodeStream(fis);

image_iv.setImageBitmap(bitmap);

} catch (FileNotFoundException e) {

e.printStackTrace();

}finally {

try {

fis.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

}

}

三、Android自定义相机

1.自定义相机步骤：

创建相机

创建SurfaceView

关联相机与SurfaceView

调整相机显示效果

自定义相机预览界面

2.核心代码：

自定义相机CustomCameraActivity.java

package com.czhappy.camerademo.activity;

import android.content.Intent;

import android.graphics.ImageFormat;

import android.hardware.Camera;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import com.czhappy.camerademo.R;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

/**

* Description:

* User: chenzheng

* Date: 2016/12/27 0027

* Time: 13:43

*/

public class CustomCameraActivity extends AppCompatActivity implements SurfaceHolder.Callback{

private SurfaceView mPreview;

private Camera mCamera;

private SurfaceHolder mHolder;

private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {

@Override

public void onPictureTaken(byte[] data, Camera camera) {

File tempFile = new File("/sdcard/temp.png");

try {

FileOutputStream fos = new FileOutputStream(tempFile);

fos.write(data);

fos.close();

Intent it = new Intent(CustomCameraActivity.this, CaptureResultActivity.class);

it.putExtra("picPath", tempFile.getAbsolutePath());

startActivity(it);

finish();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

};

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_custom_camera);

mPreview = (SurfaceView) this.findViewById(R.id.preview);

mHolder = mPreview.getHolder();

mHolder.addCallback(this);

//点击自动对焦

mPreview.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

mCamera.autoFocus(null);;

}

});

}

/**

* 拍照

* @param view

*/

public void capture(View view){

Camera.Parameters parameters = mCamera.getParameters();

parameters.setPictureFormat(ImageFormat.JPEG);

parameters.setPictureSize(800,400);

parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);//自动对焦

mCamera.autoFocus(new Camera.AutoFocusCallback() {

@Override

public void onAutoFocus(boolean success, Camera camera) {

//对焦准确拍摄照片

if(success){

mCamera.takePicture(null, null, mPictureCallback);

}

}

});

}

/**

* 获取相机对象

* @return

*/

private Camera getCamera(){

mCamera = Camera.open();

return mCamera;

}

/**

* 开始预览相机内容

*/

private void setStartPreview(Camera camera, SurfaceHolder holder){

try {

camera.setPreviewDisplay(holder);

camera.setDisplayOrientation(90);//设置相机预览为竖屏90度

camera.startPreview();

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 释放相机资源

*/

private void releaseCamera(){

if(mCamera!=null){

mCamera.setPreviewCallback(null);

mCamera.stopPreview();

mCamera.release();

mCamera = null;

}

}

@Override

protected void onResume() {

super.onResume();

if (mCamera==null){

mCamera = getCamera();

if(mHolder!=null){

setStartPreview(mCamera, mHolder);

}

}

}

@Override

protected void onPause() {

super.onPause();

releaseCamera();

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

setStartPreview(mCamera, mHolder);

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

mCamera.stopPreview();

setStartPreview(mCamera, mHolder);

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

releaseCamera();

}

}

生成图片结果页面CaptureResultActivity.java

package com.czhappy.camerademo.activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Matrix;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.widget.ImageView;

import com.czhappy.camerademo.R;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

/**

* Description:

* User: chenzheng

* Date: 2016/12/30 0030

* Time: 13:27

*/

public class CaptureResultActivity extends AppCompatActivity {

private String picPath;

private ImageView result_iv;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_capture_result);

picPath = getIntent().getStringExtra("picPath");

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

try {

FileInputStream fis = new FileInputStream(picPath);

Bitmap bitmap = BitmapFactory.decodeStream(fis);

Matrix matrix = new Matrix();

matrix.setRotate(90);//旋转90度矩阵

bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

result_iv.setImageBitmap(bitmap);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

}

}

四、项目源代码下载

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。