直接返回到主菜单以及从gallery中选择一个图片

原创于 2010-06-03 15:33:09 发布 · 154 阅读

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本文介绍了Android中Intent的两种典型使用场景：一是通过设置FLAG_ACTIVITY_CLEAR_TOP标志位实现按下返回键直接回到应用主界面；二是从图库选择图片并获取所选图片的URI。

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

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;
}
}