package com.example.choosepictest;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentUris;
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.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import android.os.Build;
import android.provider.DocumentsContract.Document;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Media;
public class MainActivity extends Activity {
public static final int TAKE_PHOTO=1;
public static final int CROP_PHOTO=2;
public static final int CHOOSE_PHOTO=3;
private Button chooseFromAlbum;
private Button takePhoto;
private ImageView picture;
private Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
takePhoto=(Button)findViewById(R.id.take_photo);
picture=(ImageView)findViewById(R.id.picture);
takePhoto.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
File outPutImage=new File(Environment.getExternalStorageDirectory(), "output_image.jpg");
try{
if(outPutImage.exists())
{
outPutImage.delete();
}
outPutImage.createNewFile();
}catch(IOException e)
{
e.printStackTrace();
}
imageUri =Uri.fromFile(outPutImage);
Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_PHOTO);
}
});
chooseFromAlbum=(Button)findViewById(R.id.choose_from_album);
chooseFromAlbum.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent=new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent, CHOOSE_PHOTO);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
switch(requestCode)
{
case TAKE_PHOTO:
if(resultCode==RESULT_OK)
{
Intent intent=new Intent("com.android.camera.action.CROP");
intent.setDataAndType(imageUri, "image/*");
intent.putExtra("scale", false);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, CROP_PHOTO);
}
break;
case CROP_PHOTO:
if(resultCode==RESULT_OK)
{
try {
Bitmap bitmap=BitmapFactory.decodeStream
(getContentResolver().openInputStream(imageUri));
picture.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
break;
case CHOOSE_PHOTO:
if(resultCode==RESULT_OK)
{
if(Build.VERSION.SDK_INT>=19)
{
handleImageOnKitKat(data);
}
else
{
handleImageBeforeKitKat(data);
}
}
break;
default:
break;
}
}
private void handleImageBeforeKitKat(Intent data) {
// TODO Auto-generated method stub
Uri uri=data.getData();
String imagePath=getImagePath(uri, null);
dispalyImage(imagePath);
}
@TargetApi(Build.VERSION_CODES.KITKAT) @SuppressLint("NewApi")
private void handleImageOnKitKat(Intent data) {
// TODO Auto-generated method stub
String imagePath =null;
Uri uri=data.getData();
if(DocumentsContract.isDocumentUri(this, uri)){
String docId=DocumentsContract.getDocumentId(uri);
if("com.android.providers.media.documents".equals(uri.getAuthority()))
{
String id=docId.split(":")[1];
String selection=MediaStore.Images.Media._ID+"="+id;
imagePath=getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);
}else if("com.android.providers.downloads.documents".equals(uri.getAuthority())){
Uri contentUri=ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId));
imagePath=getImagePath(contentUri, null);
}
}else if("content".equalsIgnoreCase(uri.getScheme())){
imagePath=getImagePath(uri, null);
}
dispalyImage(imagePath);
}
private void dispalyImage(String imagePath) {
// TODO Auto-generated method stub
if(imagePath!=null)
{
Bitmap bitmap =BitmapFactory.decodeFile(imagePath);
picture.setImageBitmap(bitmap);
}else
{
Toast.makeText(this, "获取图像失败", Toast.LENGTH_SHORT).show();
}
}
private String getImagePath(Uri uri, String selection) {
// TODO Auto-generated method stub
String path=null;
Cursor cursor=getContentResolver().query(uri, null, selection, null, null);
if(cursor!=null)
{
if(cursor.moveToFirst()){
path=cursor.getString(cursor.getColumnIndex(Media.DATA));
}
cursor.close();
}
return path;
}
}
布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<Button
android:id="@+id/take_photo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Take Photo"
/>
<Button
android:id="@+id/choose_from_album"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Choose From Album"/>
<ImageView
android:id="@+id/picture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
</LinearLayout>
权限已声明，当case CHOOSE_PHOTO:时进入handleimangeonKitkat后的if语句一个都不会进入
