使用AlertDialog弹窗实现相机拍照或者从图库选取图片显示
通过图库选图片主要就是onActivityResult方法中返回的intent中获取Uri，再根据Uri和指定列名使用contentProvider去查找出此图片的路径
使用相机拍照显示之前一篇文章已经有描述，此篇文章不对图片的大小进行处理。
2016/12/28
今天偶尔看到拍摄后再调用系统截图的，自己也搬过来吧。
代码：
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.BitmapFactory;
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.view.View.OnClickListener;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnClickListener {
private static final int FROM_CAMERA=1;
private static final int FROM_PIC=2;
private ImageView img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btn).setOnClickListener(this);
img=(ImageView) findViewById(R.id.img);
}
@Override
public void onClick(View v) {
initView();
}
private void initView(){
AlertDialog.Builder builder=new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("选择图片：")
//设置两个item
.setItems(new String[]{"相机","图库"}, new android.content.DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:
pickPicFromCam();
break;
case 1:
pickPicFromPic();
break;
default:
break;
}
}});
builder.create().show();
}
private void pickPicFromCam(){
try {
Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(createImageFile()));
startActivityForResult(intent, FROM_CAMERA);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void pickPicFromPic(){
Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, FROM_PIC);
}
String mCurrentPhotoPath;
//创建路径
private File createImageFile() throws IOException {
// Create an image file name
// String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new
// Date());
// String imageFileName = "JPEG_" + timeStamp + "_";
// File storageDir =
// getExternalFilesDir(Environment.DIRECTORY_PICTURES);//由getExternalFilesDir(),以及getFilesDir()创建的目录，应用卸载后会被删除！
//
// File image = File.createTempFile(
// imageFileName, /* prefix */
// ".jpg", /* suffix */
// storageDir /* directory */
// );
//
// // Save a file: path for use with ACTION_VIEW intents
// mCurrentPhotoPath = "file:" + image.getAbsolutePath();
// return image;
//检测内存卡是否存在
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Log.d("my", "no SDCARD!!!!");
} else {
String pre = new SimpleDateFormat("yyyy_MM_dd_hh_mm_ss_SSS")
.format(new Date());
//创建图片保存的位置
File path = new File(Environment.getExternalStorageDirectory(),
"myImage");
//如果路径不存在
if (!path.exists()) {
//创建路径，需要权限
path.mkdirs();
}
//组合全部的路径
mCurrentPhotoPath = path.toString() + File.separator + pre + ".jpg";
Log.d("my", mCurrentPhotoPath);
File file = new File(mCurrentPhotoPath);
return file;
}
return null;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==FROM_CAMERA && resultCode==RESULT_OK){
//为了方便起见，没有对图片进行压缩
img.setImageBitmap(BitmapFactory.decodeFile(mCurrentPhotoPath));
}
//从图库选择返回的结果
if(requestCode==FROM_PIC && resultCode==RESULT_OK && data!=null){
Uri uri=data.getData();
Log.d("my", uri.toString());
//要返回的列名
Cursor cursor=getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
if(cursor.moveToFirst()){
String ImgPath=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
Log.d("my", ImgPath);
img.setImageBitmap(BitmapFactory.decodeFile(ImgPath));
}
}
}
}//添加后，添加了几个方法。package secretbase.testcroppic;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
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.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnClickListener {
private static final int FROM_CAMERA=1;
private static final int FROM_PIC=2;
private ImageView img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btn).setOnClickListener(this);
img=(ImageView) findViewById(R.id.img);
}
@Override
public void onClick(View v) {
initView();
}
private void initView(){
AlertDialog.Builder builder=new AlertDialog.Builder(this)
.setIcon(R.mipmap.ic_launcher)
.setTitle("选择图片：")
//设置两个item
.setItems(new String[]{"相机","图库"}, new android.content.DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:
pickPicFromCam();
break;
case 1:
pickPicFromPic();
break;
default:
break;
}
}});
builder.create().show();
}
private void pickPicFromCam(){
try {
Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(createImageFile()));
startActivityForResult(intent, FROM_CAMERA);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void pickPicFromPic(){
Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, FROM_PIC);
}
String mCurrentPhotoPath;
//创建路径
private File createImageFile() throws IOException {
// Create an image file name
// String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new
// Date());
// String imageFileName = "JPEG_" + timeStamp + "_";
// File storageDir =
// getExternalFilesDir(Environment.DIRECTORY_PICTURES);//由getExternalFilesDir(),以及getFilesDir()创建的目录，应用卸载后会被删除！
//
// File image = File.createTempFile(
// imageFileName, /* prefix */
// ".jpg", /* suffix */
// storageDir /* directory */
// );
//
// // Save a file: path for use with ACTION_VIEW intents
// mCurrentPhotoPath = "file:" + image.getAbsolutePath();
// return image;
//检测内存卡是否存在
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Log.d("my", "no SDCARD!!!!");
} else {
String pre = new SimpleDateFormat("yyyy_MM_dd_hh_mm_ss_SSS")
.format(new Date());
//创建图片保存的位置
File path = new File(Environment.getExternalStorageDirectory(),
"myImage");
//如果路径不存在
if (!path.exists()) {
//创建路径，需要权限
path.mkdirs();
}
//组合全部的路径
mCurrentPhotoPath = path.toString() + File.separator + pre + ".jpg";
Log.d("my", mCurrentPhotoPath);
File file = new File(mCurrentPhotoPath);
return file;
}
return null;
}
//裁剪图片
private void cropImageUri(Uri uri, int outputX, int outputY, int requestCode){
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", outputX);
intent.putExtra("outputY", outputY);
intent.putExtra("scale", true);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
//使用Uri返回数据，不用bitmap
intent.putExtra("return-data", false);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true); // no face detection
startActivityForResult(intent, requestCode);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==FROM_CAMERA && resultCode==RESULT_OK){
//为了方便起见，没有对图片进行压缩
//img.setImageBitmap(BitmapFactory.decodeFile(mCurrentPhotoPath));
//对图片进行裁剪
cropImageUri(Uri.fromFile(new File(mCurrentPhotoPath)),100,100,11);
}
//从图库选择返回的结果
if(requestCode==FROM_PIC && resultCode==RESULT_OK && data!=null){
Uri uri=data.getData();
Log.d("my", uri.toString());
//要返回的列名
Cursor cursor=getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
if(cursor.moveToFirst()){
String ImgPath=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
Log.d("my", ImgPath);
img.setImageBitmap(BitmapFactory.decodeFile(ImgPath));
}
}
//裁剪后返回的圖片
if(requestCode==11 && resultCode==RESULT_OK){
img.setImageBitmap(decodeUriAsBitmap(Uri.fromFile(new File(mCurrentPhotoPath))));
}
}
//可以使用Uri創建BItmap，比用cursor方便
private Bitmap decodeUriAsBitmap(Uri uri){
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
return bitmap;
}
}//比较好的版本
http://blog.csdn.net/yueqinglkong/article/details/24729727public class MainActivity extends Activity {
private ImageView img = null;
private File tempFile = new File(Environment.getExternalStorageDirectory(),
getPhotoFileName());
private static final int PHOTO_REQUEST_TAKEPHOTO = 1;// 拍照
private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
private static final int PHOTO_REQUEST_CUT = 3;// 结果
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
// TODO Auto-generated method stub
img = (ImageView) findViewById(R.id.img);
((Button) findViewById(R.id.btn))
.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent cameraintent = new Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
// 指定调用相机拍照后照片的储存路径
cameraintent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(tempFile));
startActivityForResult(cameraintent,
PHOTO_REQUEST_TAKEPHOTO);
}
});
}
/**
* 回调
*/
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case PHOTO_REQUEST_TAKEPHOTO:// 当选择拍照时调用
startPhotoZoom(Uri.fromFile(tempFile));
break;
case PHOTO_REQUEST_GALLERY:// 当选择从本地获取图片时
// 做非空判断，当我们觉得不满意想重新剪裁的时候便不会报异常，下同
if (data != null)
startPhotoZoom(data.getData());
break;
case PHOTO_REQUEST_CUT:// 返回的结果
if (data != null)
sentPicToNext(data);
break;
}
}
private void startPhotoZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// crop为true是设置在开启的intent中设置显示的view可以剪裁
intent.putExtra("crop", "true");
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX,outputY 是剪裁图片的宽高
intent.putExtra("outputX", 300);
intent.putExtra("outputY", 300);
intent.putExtra("return-data", true);
intent.putExtra("noFaceDetection", true);
startActivityForResult(intent, PHOTO_REQUEST_CUT);
}
// 将进行剪裁后的图片传递到下一个界面上
private void sentPicToNext(Intent picdata) {
Bundle bundle = picdata.getExtras();
if (bundle != null) {
Bitmap photo = bundle.getParcelable("data");
if (photo == null) {
img.setImageResource(R.mipmap.ic_launcher);
} else {
photo = toRoundCorner((Bitmap) bundle.getParcelable("data"), 50);
Drawable drawable = new BitmapDrawable(this.getResources(),
photo);
img.setImageDrawable(drawable);
// 设置文本内容为 图片绝对路径和名字
;
}
}
}
/**
* 圆角图片处理
*
* @param bitmap
* @param radius半径50
* @return
*/
public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
// 使用系统当前日期加以调整作为照片的名称
private String getPhotoFileName() {
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat dateFormat = new SimpleDateFormat(
"'IMG'_yyyyMMdd_HHmmss");
return dateFormat.format(date) + ".jpg";
}
}