Android SystemUI源代码分析和修改

it2025-09-01 17

1.在导航栏中添加音量加减button

一些Android音量调节button。或者从保护实体按键的角度考虑，就须要在导航栏的虚拟按键中加入音量加减调节按键。

效果例如以下图所看到的：

实现步骤例如以下：

1.首先在SystemUI中加入音量加减的资源文件。路径例如以下：

frameworks/base/packages/SystemUI/res/

将图片放入相应的drawable目录，包含音量+。和音量-，见上图。

2.改动导航栏的布局文件。路径：

frameworks/base/packages/SystemUI/res/

在相应的layout目录中找到navigation_bar.xml文件进行改动：

在返回键前面加入“音量减”。返回键的布局：

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/back" android:layout_width="128dp" android:paddingStart="25dp" android:paddingEnd="25dp" android:layout_height="match_parent" android:src="@drawable/ic_sysbar_back" systemui:keyCode="4" android:layout_weight="0" systemui:glowBackground="@drawable/ic_sysbar_highlight" android:contentDescription="@string/accessibility_back" />音量减的布局例如以下。这里先把Visibility定义为Gone，然后在代码中控制是否显示：

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/sub" android:src="@drawable/sub_normal" android:layout_width="@dimen/navigation_key_width" android:layout_height="match_parent" android:layout_weight="0" systemui:keyCode="302" systemui:glowBackground="@drawable/ic_sysbar_highlight" android:visibility="gone"/> “音量加”加入到“近期应用”之后，近期应用的布局：

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/recent_apps" android:layout_width="128dp" android:paddingStart="25dp" android:paddingEnd="25dp" android:layout_height="match_parent" android:src="@drawable/ic_sysbar_recent" android:layout_weight="0" systemui:glowBackground="@drawable/ic_sysbar_highlight" android:contentDescription="@string/accessibility_recent" /> 音量加的布局：

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/add" android:src="@drawable/add_normal" android:layout_width="@dimen/navigation_key_width" android:layout_height="match_parent" android:layout_weight="0" systemui:keyCode="301" systemui:glowBackground="@drawable/ic_sysbar_highlight" android:visibility="gone"/> 3.接着改动代码逻辑，文件路径：

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

在private void prepareNavigationBarView() {……}函数中加入显示音量加减的代码：

mNavigationBarView.getAddVolume().setVisibility(View.VISIBLE); mNavigationBarView.getSubVolume().setVisibility(View.VISIBLE); 相应的函数getAddVolume()和getAddVolume()要在

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

中实现：

public View getAddVolume(){ return mCurrentView.findViewById(R.id.add); } public View getSubVolume(){ return mCurrentView.findViewById(R.id.sub); } 最后就是功能实现了。在

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

中加入监听函数：

private View.OnTouchListener mAddVolumeOnTouchListener = new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent ev) { final int action = ev.getAction(); switch(action) { case MotionEvent.ACTION_DOWN: is_down = true; Adjust_Volume(true); maddHandler.postDelayed(maddRun, ADJUST_VOLUME_DELAY * 2); break; case MotionEvent.ACTION_MOVE: is_down = true; maddHandler.postDelayed(maddRun, ADJUST_VOLUME_DELAY * 2); // maddHandler.removeCallbacks(maddRun); break; case MotionEvent.ACTION_UP: is_down = false; maddHandler.removeCallbacks(maddRun); break; } return true; } }; private View.OnTouchListener mSubVolumeOnTouchListener = new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent ev) { final int action = ev.getAction(); int x, y; //int mCode = ev.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: is_down = true; Adjust_Volume(false); msubHandler.postDelayed(msubRun, ADJUST_VOLUME_DELAY * 2); break; case MotionEvent.ACTION_MOVE: is_down = true; msubHandler.postDelayed(msubRun, ADJUST_VOLUME_DELAY * 2); //msubHandler.removeCallbacks(msubRun); break; case MotionEvent.ACTION_UP: is_down = false; msubHandler.removeCallbacks(msubRun); break; } return true; } }; public void Adjust_Volume(boolean opition){ AudioManager audioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE); if (audioManager != null) { // // Adjust the volume in on key down since it is more // responsive to the user. // if(opition){ audioManager.adjustSuggestedStreamVolume( AudioManager.ADJUST_RAISE, AudioManager.USE_DEFAULT_STREAM_TYPE, AudioManager.FLAG_SHOW_UI | AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE); }else{ audioManager.adjustSuggestedStreamVolume( AudioManager.ADJUST_LOWER, AudioManager.USE_DEFAULT_STREAM_TYPE, AudioManager.FLAG_SHOW_UI | AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE); } } }

转载请注明出处：周木水的博客 http://blog.csdn.net/zhoumushui

转载于:https://www.cnblogs.com/bhlsheji/p/4658576.html

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