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最新推荐文章于 2025-02-01 21:43:41 发布

chunlongyuan

最新推荐文章于 2025-02-01 21:43:41 发布

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分类专栏： android琐事

本文链接：https://blog.youkuaiyun.com/chunlongyuan/article/details/8746067

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本文详细介绍了如何通过优化代码实现用户在选择选项菜单后查看下载窗口的功能，并且展示了如何利用Intent进行不同请求结果的处理。同时，文章还涉及了结果回调、下载管理器的使用，以及对下载窗口的显示逻辑。

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SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(ctx);

long uptimeMillis = SystemClock.uptimeMillis();

// Fix heap utilization for better heap size characteristics.
float TARGET_HEAP_UTILIZATION = 0.75f;
VMRuntime.getRuntime().setTargetHeapUtilization(TARGET_HEAP_UTILIZATION);

/*
* This method is called as a result of the user selecting the options menu
* to see the download window. It shows the download window on top of the
* current window.
*/
private void viewDownloads() {
Intent intent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
startActivity(intent);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {

switch (requestCode) {
case COMBO_PAGE:
if (resultCode == RESULT_OK && intent != null) {
String data = intent.getAction();
Bundle extras = intent.getExtras();

}
// Deliberately fall through to PREFERENCES_PAGE, since the
// same extra may be attached to the COMBO_PAGE
case PREFERENCES_PAGE:
if (resultCode == RESULT_OK && intent != null) {
String action = intent.getStringExtra(Intent.EXTRA_TEXT);

}
break;
// Choose a file from the file picker.
case FILE_SELECTED:
if (null == mUploadMessage)
break;
Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();

break;
default:
break;
}
}