Android - Show/Hide system bar on 4.2.2 (Nexus 10)

问题:

I got issue with Nexus 10 - 4.2.2. I was testing code below on Galaxy Tab 10.1 with 4.0.4 and it was working fine:

try  {     Process proc = Runtime.getRuntime().exec(new String[]{"sh","startservice","-n","com.android.systemui/.SystemUIService"});     proc.waitFor(); }  catch (Exception e)  {     e.printStackTrace(); }  try {     //REQUIRES ROOT     Process proc = Runtime.getRuntime().exec(new String[]{"su","-c","service call activity 42 s16 com.android.systemui"}); //WAS 79     proc.waitFor(); } catch(Exception ex) {     //Toast.makeText(getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show(); } 

But on Nexus 10 system bar won't show after, just hide.

回答1:

To show and hide the system bar and notification bar on 4.2.2 and others:

Hide:

    try     {         String command;         command = "LD_LIBRARY_PATH=/vendor/lib:/system/lib service call activity 42 s16 com.android.systemui";         Process proc = Runtime.getRuntime().exec(new String[] { "su", "-c", command }, envp);         proc.waitFor();     }     catch(Exception ex)     {         Toast.makeText(getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show();     } 

Show:

    try      {          String command;          command = "LD_LIBRARY_PATH=/vendor/lib:/system/lib am startservice -n com.android.systemui/.SystemUIService";          Process proc = Runtime.getRuntime().exec(new String[] { "su", "-c", command }, envp);          proc.waitFor();     }      catch (Exception e)      {           e.printStackTrace();     } 

回答2:

I think you should not use system calls via Runtime.exec() to get that result. You should look at the code in FullscreenActivity template (sources are placed in <android-sdk-folder>/tools/templates/activities/FullscreenActivity/root): that is a full working example showing how to show/hide system bars (both top and bottom one) programmatically, and it even supports animations for API 13+.

回答3:

Answer by goodm works fine, but most of us are not aware about envp

So here is full code:

HIDE

try {     String command;     command = "LD_LIBRARY_PATH=/vendor/lib:/system/lib service call activity 42 s16 com.android.systemui";      ArrayList<String> envlist = new ArrayList<String>();     Map<String, String> env = System.getenv();     for (String envName : env.keySet()) {         envlist.add(envName + "=" + env.get(envName));     }     String[] envp = (String[]) envlist.toArray(new String[0]);     Process proc = Runtime.getRuntime().exec(new String[] { "su", "-c", command }, envp);     proc.waitFor(); } catch(Exception ex) {     Toast.makeText(getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show(); } 

You can use similar for show.

文章来源: Android - Show/Hide system bar on 4.2.2 (Nexus 10)