求大佬帮帮忙,为啥我这个程序显示停止运行呀,是哪里出错了吗,帮我看看

xml部分
<?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:layout_height="match_parent"
    android:background="#EFEFF4"
    android:orientation="vertical"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    tools:context=".MainActivity">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="fitStart"
        android:src="@drawable/abc"/>
<Button
    android:id="@+id/login"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="拍照识别"/>
<ImageView
    android:id="@+id/picture"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"/>
</LinearLayout>


java部分
package com.example.myapps;

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.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

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

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    public static final int TAKE_PHOTO = 1;
    public static final int CROP_PHOTO = 2;
    private Button login;
    private ImageView picture;
    private Uri imageUri;

    public MainActivity(Button login, ImageView picture, Uri imageUri) {
        this.login = login;
        this.picture = picture;
        this.imageUri = imageUri;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        switch (requestCode){
            case TAKE_PHOTO:
                if (requestCode ==RESULT_OK){
                    Intent intent = new Intent("com.android.camera.action.CROP");
                    intent.setDataAndType(imageUri,"image/*");
                    intent.putExtra("scale",true);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                    startActivityForResult(intent,CROP_PHOTO);
                }
                break;
            case CROP_PHOTO:
                if(resultCode == RESULT_OK){
                    try {
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver()
                        .openInputStream(imageUri));
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button login= findViewById(R.id.login);
        ImageView picture=findViewById(R.id.picture);
        login.setOnClickListener(this);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                switch (view.getId()){
                    case R.id.login:
                        File outputImage = new File(Environment.getExternalStorageDirectory(),
                                "tempImage"+"jpg");
                        try{
                            if (outputImage.exists()){
                                outputImage.delete();
                            }
                            outputImage.createNewFile();
                        }catch (IOException e){
                            e.printStackTrace();
                        }
                        imageUri = Uri.fromFile(outputImage);
                        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                        intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                        startActivityForResult(intent,TAKE_PHOTO);
                        break;
                }
                Toast.makeText(MainActivity.this,"开始拍照识别",Toast.LENGTH_LONG).show();
            }
        });

    }


    @Override
    public void onClick(View view) {

    }
}

 

>程序显示停止运行?

具体出错信息是什么呢?

Activity为啥要给设置构造方法,去掉应该就可以了。关于构造方法使用可以参考下https://blog.csdn.net/ccpat/article/details/54915200

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