Android学习之调用系统相机拍照、截图并保存

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 =new
Intent(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