
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);
}
}
}
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