android調用系統照相機拍照

調用系統照相機拍照，之後將照片保存到sdCard中，從界面中再回顯出來：

佈局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/iv"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
       />
    <Button
        android:id="@+id/bt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="拍照"></Button>

</LinearLayout>

點擊按鈕調用系統相機：

     bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!path.exists()){
                    path.mkdir();

                }

                if (!file.exists()){
                    try {
                        file.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                }

                Intent intent =new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
                startActivityForResult(intent,1);


            }
        });

拍照之後從文件中加載照片；

 @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==1){
            iv.setImageURI(Uri.fromFile(file));


        }

    }

代碼如下：

package com.example.usesystemcamera;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {
    private Button bt;
    private ImageView iv;
    private File path ;
    private File file ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt=findViewById(R.id.bt);
        iv=findViewById(R.id.iv);
        path = new File(Environment.getExternalStorageDirectory(),"PHOTO");
        file =new File(path,System.currentTimeMillis()+".jpg");

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!path.exists()){
                    path.mkdir();

                }

                if (!file.exists()){
                    try {
                        file.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                }

                Intent intent =new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
                startActivityForResult(intent,1);


            }
        });



    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==1){
            iv.setImageURI(Uri.fromFile(file));


        }

    }
}

加入文件讀寫權限：

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