我正在制作一个应用程序，我可以从画廊中选择一个图像，或者我可以从相机拍摄图像，我正在使用所选图像进行下一个活动。我想区分图像是来自图库还是相机我不知道该怎么做。我正在提供我的代码。请帮我解决这个问题。
我的第一项活动是
import java.io.ByteArrayOutputStream;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
public class LauncherActivity extends Activity
{
private static final int CAMERA_REQUEST = 1888;
private static int RESULT_LOAD_IMAGE = 1;
ImageButton camera;
ImageButton gallery;
ImageView gallery_image;
protected void onCreate(Bundle paramBundle)
{
super.onCreate(paramBundle);
setContentView(R.layout.launcher);
gallery = (ImageButton)findViewById(R.id.select_photo);
camera = (ImageButton)findViewById(R.id.take_photo);
gallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent gallery_intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(gallery_intent, RESULT_LOAD_IMAGE);
}
});
camera.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
intent.putExtra("path", picturePath);
startActivity(intent);
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK && data!=null) {
Bitmap photo_from_camera = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo_from_camera.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
intent.putExtra("image", byteArray);
startActivity(intent);
}
}
}
我的第二项活动是
public class MainActivity extends Activity
{
Bitmap scaled;
protected void onCreate(Bundle paramBundle)
{
super.onCreate(paramBundle);
setContentView(R.layout.activity_main);
if(//condition to The image coming from gallery)
{
Bundle extras=getIntent().getExtras();
String picturePath=extras.getString("path");
scaled=BitmapFactory.decodeFile(picturePath);
//the things i have to do with bitmap that i know
}
if(//Condition to the image coming from camera)
{
Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("image");
Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
scaled = Bitmap.createScaledBitmap(bitmap, width, height, true);
//the things i have to do with bitmap that i know
}
}
}
这里我没有得到代码来写if语句中的条件。请帮助我。谢谢。提前感谢。
答案 0 :(得分：3)
startActivityForResult(cameraIntent, CAMERA_REQUEST);
startActivityForResult(gallery_intent, RESULT_LOAD_IMAGE);
关于您的请求代码，您可以区分图片来自图库或相机
boolean gallery;
if(requestCode == CAMERA_REQUEST){
//then image from camera
gallery=true;
galleryIntent intent = new Intent(LauncherActivity.this, MainActivity.class);
intent.putExtra("path", picturePath);
intent.putExtra("isfrom", gallery);
startActivity(intent);
}
if(requestCode == RESULT_LOAD_IMAGE){
galleryIntent intent = new Intent(LauncherActivity.this, MainActivity.class);
intent.putExtra("path", picturePath);
intent.putExtra("isfrom", gallery);
startActivity(intent);
//then image from gallery
}
在第二个活动中你可以从intent获得布尔值。如果它是来自画廊的真实图像
答案 1 :(得分：0)
// try this way,hope this will help you...
launcher.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/select_photo"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Gallery"/>
<Button
android:id="@+id/take_photo"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Camera"/>
</LinearLayout>
</LinearLayout>
activity_main
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"/>
</LinearLayout>
LauncherActivity.java
public class LauncherActivity extends Activity {
private static final int CAMERA_REQUEST = 1;
private static final int RESULT_LOAD_IMAGE = 2;
Button camera;
Button gallery;
ImageView imageView;
private String imgPath;
protected void onCreate(Bundle paramBundle) {
super.onCreate(paramBundle);
setContentView(R.layout.launcher);
gallery = (Button) findViewById(R.id.select_photo);
camera = (Button) findViewById(R.id.take_photo);
imageView = (ImageView) findViewById(R.id.imageView);
gallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, ""), RESULT_LOAD_IMAGE);
}
});
camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
startActivityForResult(intent, CAMERA_REQUEST);
}
});
}
public Uri setImageUri() {
// Store image in dcim
File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png");
Uri imgUri = Uri.fromFile(file);
this.imgPath = file.getAbsolutePath();
return imgUri;
}
public String getImagePath() {
return imgPath;
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == RESULT_LOAD_IMAGE) {
imageView.setImageBitmap(decodeFile(getAbsolutePath(data.getData())));
Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
intent.putExtra("path", getAbsolutePath(data.getData()));
intent.putExtra("from", "Gallery");
startActivity(intent);
} else if (requestCode == CAMERA_REQUEST) {
imageView.setImageBitmap(decodeFile(getImagePath()));
Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
intent.putExtra("path", getImagePath());
intent.putExtra("from", "Camera");
startActivity(intent);
}
}
}
public String getAbsolutePath(Uri uri) {
if(Build.VERSION.SDK_INT >= 19){
String id = uri.getLastPathSegment().split(":")[1];
final String[] imageColumns = {MediaStore.Images.Media.DATA };
final String imageOrderBy = null;
Uri tempUri = getUri();
Cursor imageCursor = getContentResolver().query(tempUri, imageColumns,
MediaStore.Images.Media._ID + "="+id, null, imageOrderBy);
if (imageCursor.moveToFirst()) {
return imageCursor.getString(imageCursor.getColumnIndex(MediaStore.Images.Media.DATA));
}else{
return null;
}
}else{
String[] projection = { MediaStore.MediaColumns.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
if (cursor != null) {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} else
return null;
}
}
private Uri getUri() {
String state = Environment.getExternalStorageState();
if(!state.equalsIgnoreCase(Environment.MEDIA_MOUNTED))
return MediaStore.Images.Media.INTERNAL_CONTENT_URI;
return MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
}
public Bitmap decodeFile(String path) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 1024;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeFile(path, o2);
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}
}
MainActivity.java
public class MainActivity extends Activity {
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
Toast.makeText(this,getIntent().getStringExtra("from"),Toast.LENGTH_SHORT)
.show();
imageView.setImageBitmap(decodeFile(getIntent().getStringExtra("path")));
}
public Bitmap decodeFile(String path) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 1024;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeFile(path, o2);
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}
}
Note : please not forget this permission in AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />