Android 开发随手笔记之使用摄像头拍照

import android.app.Activity; import android.content.Intent;

import android.net.Uri; import android.os.Bundle;

import android.os.Environment; import android.provider.MediaStore;

import android.util.Log; import android.view.View;

import android.widget.Button; import android.widget.ImageView;

import java.io.File; public class MainActivity extends Activity {

private File fileName = null; private Button button;

private ImageView imageView; @Override

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main); button = (Button)findViewById(R.id.button);

imageView = (ImageView)findViewById(R.id.imageView); button.setOnClickListener(new View.OnClickListener() {

@Override public void onClick(View v) {

File filePath = new File(Environment.getExternalStorageDirectory(), "myCamera"); if(!filePath.exists()){

filePath.mkdirs(); }

fileName = new File(filePath, System.currentTimeMillis() + ".jpg"); try{

if(!fileName.exists()){ fileName.createNewFile();

} }catch (Exception e){

e.printStackTrace(); }

// intent用来启动系统自带的Camera Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

// 将系统Camera的拍摄结果写入到文件 intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(fileName));

// 启动intent对应的Activity，返回默认消息 startActivityForResult(intent, Activity.DEFAULT_KEYS_DIALER);

} });

} @Override

protected void onActivityResult(int requestCode, int resultCode, Intent data){ if(requestCode == Activity.DEFAULT_KEYS_DIALER){

// MainActivity接收Camera返回的消息，然后将已经写入的图片显示在ImageView内 imageView.setImageURI(Uri.fromFile(fileName));