Android学习之调用系统相机拍照、截图并保存

来源：互联网发布：诺基亚n8软件编辑：程序博客网时间：2024/04/29 11:16

最近写一款拍照的APP用到了拍照，截图，并返回ImageView。网上找了好几种fang法，发现最好还是调用系统自带的，既简单又方便。

启用android 系统相机

intent =newIntent(MediaStore.ACTION_IMAGE_CAPTURE);

启用android截图

intent = new Intent("com.android.camera.action.CROP");//动作-裁剪

下面是我的代码

import android.content.Intent;import android.graphics.Bitmap;import android.os.Environment;import android.provider.MediaStore;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.net.Uri;import android.widget.TextView;import android.widget.Toast;import com.soundcloud.android.crop.Crop;import java.io.File;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Locale;import butterknife.Bind;import butterknife.ButterKnife;import butterknife.OnClick;import me.qincai.newton.R;import me.qincai.newton.listener.NavigationFinishClickListener;import me.qincai.newton.util.Utils;public class MainActivity extends AppCompatActivity implements Toolbar.OnMenuItemClickListener {    private static final int REQUEST_IMAGE_CAPTURE = 330;    private static File photoFile;    private static File cropFile;    public static String crop;    public static String crop1;    @Bind(R.id.main_toolbar)    protected Toolbar toolbar;    @Bind(R.id.tv_register)    protected TextView tv_register;    @Bind(R.id.btn_capture)    protected com.rey.material.widget.Button btn_capture;    private static final int REQUEST_CROP = 332;    public static final int REQUEST_LOGIN = 331;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        toolbar.setNavigationOnClickListener(new NavigationFinishClickListener(this));        toolbar.inflateMenu(R.menu.menu_main);        toolbar.setOnMenuItemClickListener(this);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }    @Override    public boolean onMenuItemClick(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        switch (id) {            case R.id.action_user:                if (Utils.isLogin()) {                    Intent intent = new Intent(MainActivity.this, ProfileActivity.class);                    startActivity(intent);                } else {                    Utils.loginRequired(MainActivity.this);                }                return true;            case R.id.action_questions:                Intent intent = new Intent(MainActivity.this, QuestionsActivity.class);                startActivity(intent);                return true;            default:                return false;        }    }    @OnClick(R.id.btn_capture)    public void onCapture() {        // 未登陆则引导登陆        if (!Utils.isLogin()) {            Utils.loginRequired(MainActivity.this);        } else {            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);            if (intent.resolveActivity(getPackageManager()) != null) {                try {                    photoFile = createImageFile();                } catch (IOException e) {                    Toast.makeText(this, "写入图片出错", Toast.LENGTH_SHORT).show();                }                if (photoFile != null) {                    intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));                    startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);                }            }        }    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (data == null)        if (resultCode != RESULT_OK)            return;        switch (requestCode) {            case REQUEST_IMAGE_CAPTURE:                Uri u = Uri.fromFile(photoFile);                cropPhoto(u);                break;            case REQUEST_CROP:                Log.e("截图成功onActivityResult", "data is " + data.toString());                handleCrop();                break;            case REQUEST_LOGIN:                break;        }    }    public void cropPhoto(Uri uri) {        try {            cropFile = createImageFile();        }catch (IOException e)        {            Log.e("jianliwenjiancuowu","sedfwedf");        }        if (uri == null) {            return;        }        Intent intent = new Intent("com.android.camera.action.CROP");//动作-裁剪        intent.setDataAndType(uri, "image/*");//类型        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(cropFile));//// 输出文件        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());// 输出格式        intent.putExtra("crop", true);        intent.putExtra("scale", true);// 缩放        intent.putExtra("scaleUpIfNeeded", true);// 如果小于要求输出大小，就放大        intent.putExtra("return-data", false);// 不返回缩略图        intent.putExtra("noFaceDetection", true);// 关闭人脸识别        startActivityForResult(intent,REQUEST_CROP);    }    private void handleCrop() {        Intent intent = new Intent(MainActivity.this, PreviewActivity.class);        intent.putExtra("image_cropped_file", cropFile.toString());        startActivity(intent);    }    private File createImageFile() throws IOException {        // Create an image file name        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.CHINA).format(new Date());        String imageFileName = "QC_" + timeStamp + "_";        File storageDir = Environment.getExternalStoragePublicDirectory(                Environment.DIRECTORY_PICTURES);        File image = File.createTempFile(                imageFileName,  /* prefix */                ".jpg",         /* suffix */                storageDir      /* directory */        );        // Save a file: path for use with ACTION_VIEW intents        return image;    }    @OnClick(R.id.tv_register)    protected void onRegisterClick() {        Intent intent = new Intent(MainActivity.this, RegisterActivity.class);        startActivity(intent);    }}

这就是简单的调用系统相机，如果大家有兴趣想自定义一个相机的话，可以看一看我的这篇博客：【Android 开发】SufaceView自定义相机拍照

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