[安卓開發基礎] 拍照Camera
阿新 • • 發佈：2019-01-13
安卓 6.0 以上除了清單檔案申明許可權外，還要動態申請許可權。
<!-- 授予程式可以向SD卡中儲存檔案的許可權 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <!-- 授予程式使用攝像頭的許可權 --> <uses-permission android:name="android.permission.CAMERA"/> <uses-feature android:name="android.hardware.camera.autofocus"/> <uses-feature android:name="android.hardware.camera"/>
1.幀布布局：
package com.camera;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.Toast;
import com.zengjx.androidbaseproject.R;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import permissions.dispatcher.NeedsPermission;
import permissions.dispatcher.OnShowRationale;
import permissions.dispatcher.RuntimePermissions;
import permissions.dispatcher.PermissionRequest;
@RuntimePermissions
public class CameraActivity extends AppCompatActivity {
private ImageButton imageButton_Camera,imageButton_PreView;
private SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
private boolean isPreView=false;
private Camera camera;
private final String TAG="CameraActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
setTitle("相機");
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
//sdcard
if(!android.os.Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
Toast.makeText(this,"SD未安裝",Toast.LENGTH_SHORT).show();
}
initView();
}
//實現將照片儲存到系統圖庫中
final Camera.PictureCallback jpeg2 = new Camera.PictureCallback() { //照片回撥函式
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// 根據拍照所得的資料建立點陣圖
final Bitmap bm = BitmapFactory.decodeByteArray(data, 0,
data.length);
camera.stopPreview(); //停止預覽
isPreView = false; //設定為非預覽狀態
//獲取sd卡根目錄
File appDir = new File(Environment.getExternalStorageDirectory(), "/DCIM/Camera/");
if (!appDir.exists()) { //如果該目錄不存在
appDir.mkdir(); //就建立該目錄
}
String fileName = System.currentTimeMillis() + ".jpg"; //將獲取當前系統時間設定為照片名稱
File file = new File(appDir, fileName); //建立檔案物件
try { //儲存拍到的圖片
FileOutputStream fos = new FileOutputStream(file); //建立一個檔案輸出流物件
bm.compress(Bitmap.CompressFormat.JPEG, 100, fos); //將圖片內容壓縮為JPEG格式輸出到輸出流物件中
fos.flush(); //將緩衝區中的資料全部寫出到輸出流中
fos.close(); //關閉檔案輸出流物件
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//將照片插入到系統圖庫
try {
MediaStore.Images.Media.insertImage(CameraActivity.this.getContentResolver(),
file.getAbsolutePath(), fileName, null);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// 最後通知相簿更新
CameraActivity.this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
Uri.parse("file://" + "")));
Toast.makeText(CameraActivity.this, "照片儲存至：" + file, Toast.LENGTH_LONG).show();
resetCamera(); //呼叫重新預覽resetCamera()方法
}
};
final Camera.PictureCallback jpeg = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] bytes, Camera camera) {
//1根據拍照建立點陣圖物件
final Bitmap bitmap= BitmapFactory.decodeByteArray(bytes,0,bytes.length);
camera.stopPreview(); // 2停止預覽
//3標誌位 復位為 非預覽
isPreView=false;
//4獲取Sd 目錄 目錄不存在 建立目錄
// String dir=Environment.getExternalStorageDirectory(),"/DICM/Camera/";
// Log.i(TAG,"dir="+dir);
File appDir=new File( Environment.getExternalStorageDirectory(),"/DICM/Camera/");
if(!appDir.exists()){
Log.i(TAG,"建立目錄");
appDir.mkdir();//目錄不存在建立
Log.i(TAG,"建立目錄--2"+appDir.exists());
}else{
Log.i(TAG,"目錄存在");
}
//儲存拍到的圖片
String fileName=System.currentTimeMillis()+".jpg";//系統時間作為圖片名稱
File file= new File(appDir,fileName);//建立檔案物件
try{ //拍到圖片
FileOutputStream fos =new FileOutputStream(file); //建立檔案輸出流物件
//將圖片壓縮為JPEG 格式 輸出到檔案輸出流
bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos);
fos.flush();//將緩衝區中的資料全部寫出到輸出流中
fos.close();//關閉檔案輸出流物件
Log.i(TAG,"關閉檔案輸出流物件");
}catch (FileNotFoundException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//將圖片插入到系統圖庫
try{
MediaStore.Images.Media.insertImage(CameraActivity.this.getContentResolver(), file.getAbsolutePath(), fileName, null);
}catch (FileNotFoundException e){
e.printStackTrace();
}
//最後通知相簿更新
// CameraActivity.this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"+"")));
// 最後通知相簿更新
CameraActivity.this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
Uri.parse("file://" + "")));
Toast.makeText(CameraActivity.this,"圖片儲存至"+file,Toast.LENGTH_SHORT).show();
resetCamera();//重新預覽
}
};
public void resetCamera(){
if(!isPreView){
isPreView=true;
camera.startPreview();
}
}
public void initView(){
surfaceView =(SurfaceView) findViewById(R.id.surface);
//獲取 SurfaceHolder
surfaceHolder =surfaceView.getHolder();
//設定 sufaceholder 不自己維護緩衝
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
imageButton_Camera= (ImageButton) findViewById(R.id.btn_camera) ;
imageButton_PreView= (ImageButton)findViewById(R.id.btn_preview);
imageButton_Camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(camera!=null){
camera.takePicture(null,null,jpeg);
}
}
});
imageButton_PreView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(!isPreView){
// cameratest();
// checkselfPermisssion2();
cameratest();
}
}
});
}
/*
@NeedsPermission(Manifest.permission.CAMERA,Manifest.p)
void camera() {
{
camera=Camera.open();
if(camera==null){
Toast.makeText(this,"無許可權",Toast.LENGTH_SHORT).show();
return;
}
isPreView=true;
try {
camera.setPreviewDisplay(surfaceHolder);
//獲取攝像頭引數
Camera.Parameters parameters = camera.getParameters();
parameters.setPictureSize(640,480);
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.set("jpeg-quality",80);
//重新設定攝像頭引數
camera.setParameters(parameters);//重新設定預覽
camera.startPreview();//開始預覽
camera.autoFocus(null);//設定自動對焦
} catch (IOException e) {
e.printStackTrace();
}
}
}
*/
@SuppressLint("NeedOnRequestPermissionsResult")
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
CameraActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);
}
@OnShowRationale(Manifest.permission.CAMERA)
void camera_show(PermissionRequest request) {
}
@NeedsPermission({Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE})
void cameratest() {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA},
1);
camera=Camera.open();
if(camera==null){
Toast.makeText(this,"無許可權",Toast.LENGTH_SHORT).show();
return;
}else{
Toast.makeText(this,"開啟成功",Toast.LENGTH_SHORT).show();
}
isPreView=true;
try {
camera.setPreviewDisplay(surfaceHolder);
//獲取攝像頭引數
Camera.Parameters parameters = camera.getParameters();
// parameters.setPictureSize(480,480);
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.set("jpeg-quality",80);
//重新設定攝像頭引數
camera.setParameters(parameters);//重新設定預覽
camera.startPreview();//開始預覽
camera.autoFocus(null);//設定自動對焦
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(this,"cameratest",Toast.LENGTH_SHORT).show();
}
@OnShowRationale({Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE})
void cameratest_show(final PermissionRequest request) {
Toast.makeText(this,"cameratest_show",Toast.LENGTH_SHORT).show();
}
//當停止Activity 暫停時候 停止
@Override
protected void onPause() { //當暫停Activity時，停止預覽並釋放資源
if (camera != null) { //如果相機不為空
Toast.makeText(this,"onPause!!!!!",Toast.LENGTH_SHORT).show();
// camera.stopPreview(); //停止預覽---這種方式在 安卓6.0 7.0 會不顯示預覽介面
// camera.release(); //釋放資源
}
super.onPause();
}
@Override
protected void onStop() {
Toast.makeText(this,"onStop!!!!!",Toast.LENGTH_SHORT).show();
// camera.stopPreview(); //停止預覽-- 安卓6.0 7.0 會不顯示預覽介面
// camera.release(); //釋放資源
super.onStop();
}
@Override
protected void onDestroy() {
Toast.makeText(this,"onDestroy!!!!!",Toast.LENGTH_SHORT).show();
camera.stopPreview(); //停止預覽
camera.release(); //釋放資源
super.onDestroy();
}
public void checkselfPermisssion2(){
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
if (!ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.CAMERA)) {
//第一次全新進入時，shouldShowRequestPermissionRationale方法將返回false,這裡將會執行。
//請求許可權時如果點了拒絕但是沒勾選不再提醒，shouldShowRequestPermissionRationale方法將返回true，這裡將不執行。
//點了拒絕且勾選了不再提醒，再次進入時，shouldShowRequestPermissionRationale方法也將返回false,並且許可權請求將無任何響應，然後可以在下面方法中做些處理，提示使用者開啟許可權。
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA},
1);//1 表示使用者唯一標識一個許可權請求以便回撥時進行判斷
Log.i("permission","request");
} else {
Log.i("permission","request2");
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_CONTACTS},
1);
}
}
}
}