直接返回到主菜单以及从gallery中选择一个图片

1.Intent intent = new Intent(this, MainMenu.class);?
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);?
startActivity(intent);?

上述情况是指 如果你有多个activivty，如果俺back建要一丛丛返回，上面的实现了只返回到主界面

?

2.

private static final int MEDIA_IMAGE_REQUEST_CODE = 203948; // This can be any unique number you like?
?
Intent getImageFromGalleryIntent = ?
? new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);?
startActivityForResult(getImageFromGalleryIntent, MEDIA_IMAGE_REQUEST_CODE);?

protected final void onActivityResult(final int requestCode, final int resultCode, final Intent i) {?
? super.onActivityResult(requestCode, resultCode, i);?
? if(resultCode == RESULT_OK) {?
? ? switch(requestCode) {?
? ? ? case MEDIA_IMAGE_REQUEST_CODE:?
?
? ? ? ? // Get the chosen images Uri?
? ? ? ? Uri imageUri = i.getData();?
?
? ? ? ? // Load the bitmap data from the Uri ?
? ? ? ? // It is probably best to do this in an AsyncTask to avoid clogging up the Main Thread?
? ? ? break;?
? ? }?
? }?