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    <p>"Result set changed" means that the set of packages matching that intent has changed from the set you specified when you created the default - - so the default is no longer valid. Your list of components (which you are currently setting to null) needs to contain all homescreen apps present on device, not just yours.</p> <p>Here's example code that I have tested (using adb shell am start <a href="http://www.google.co.uk/" rel="noreferrer">http://www.google.co.uk/</a> ) and used to set the default browser. XXX represents a customer name that I had to black out. </p> <p>Note that in order to call addPreferredActivity you must have compiled against a minimum-sdk version of 8 (2.2) and you must have specified the SET_PREFERRED_APPLICATIONS permission. That permission is protection level 2, so you need to be signed with the same certificate as PackageManager.</p> <pre><code>IntentFilter filter = new IntentFilter(); filter.addAction("android.intent.action.VIEW"); filter.addCategory("android.intent.category.DEFAULT"); filter.addDataScheme("http"); Context context = getApplicationContext(); ComponentName component = new ComponentName("com.opera.mini.XXX", "com.opera.mini.XXX.CustomerBrowser"); ComponentName[] components = new ComponentName[] {new ComponentName("com.android.browser", "com.android.browser.BrowserActivity"), component}; pm.addPreferredActivity(filter, IntentFilter.MATCH_CATEGORY_SCHEME, components, component); </code></pre> <p>ETA - if you marked this response down, could you let me know why. The code I posted above is tested and working...</p>
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    2. COI also want to implement it, I want to change the default launcher after the first booting. I have put the code to the PackageManagerService's constructor, but it always failed. Can you tell me If I want to do it, which position should I put the code? thanks very much!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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