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最新推荐文章于 2025-07-03 16:25:47 发布

原创最新推荐文章于 2025-07-03 16:25:47 发布 · 166 阅读

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本文介绍了一个Android应用中实现拍照并裁剪图片，以及从图库选取图片并进行裁剪的功能。通过Intent调用系统相机和图库，使用MediaStore.ACTION_IMAGE_CAPTURE和Intent.ACTION_PICK获取图片，再通过裁剪Intent调整图片尺寸。

package com.example.lianxi;

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;

public class MainActivity extends AppCompatActivity {
    private Button bu1,bu2;
    private ImageView imageView;
    private String path=Environment.getExternalStorageDirectory()+"/1603A.png";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bu1=findViewById(R.id.bu);
        bu2=findViewById(R.id.bu2);
        imageView=findViewById(R.id.img);
        bu1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(path)));
                startActivityForResult(intent,1000);
            }
        });
        bu2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                startActivityForResult(intent,3000);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==1000&&resultCode==RESULT_OK){
            Intent intent=new Intent("com.android.camera.action.CROP");
            intent.setDataAndType(Uri.fromFile(new File(path)),"image/*");
            intent.putExtra("crop",true);
            intent.putExtra("outputX",250);
            intent.putExtra("outputY",250);
            intent.putExtra("aspectX",2);
            intent.putExtra("aspectY",1);
            intent.putExtra("return-data",true);
            startActivityForResult(intent,2000);
        }
        if (requestCode==2000&&resultCode==RESULT_OK){
            Bitmap bitmap=data.getParcelableExtra("data");
            imageView.setImageBitmap(bitmap);
        }
        if (requestCode==3000&&resultCode==RESULT_OK){
            Uri uri = data.getData();
            Intent intent=new Intent("com.android.camera.action.CROP");
            intent.putExtra("crop",true);
            intent.putExtra("aspectX",2);
            intent.putExtra("aspectY",1);
            intent.putExtra("outputX",250);
            intent.putExtra("outputY",250);
            intent.setDataAndType(uri,"image/*");
            intent.putExtra("return-data",true);
            startActivityForResult(intent,4000);
        }
        if (requestCode==4000&&resultCode==RESULT_OK){
            Bitmap bitmap=data.getParcelableExtra("data");
            imageView.setImageBitmap(bitmap);
        }
    }
}