RK平台修改Setting蓝牙分享界面搜索刷新图标大小

一、RK芯片安卓平板、AOSP系统

 二、修改原因：客户需求，蓝牙分享界面的搜索刷新图标太小，不明显

三、问题定位

首先通过adb install安装ES文件浏览器，再使用里面的文件分享功能，调出蓝牙共享界面；

调出界面后使用如下指令，获取当前activity；

adb shell 
dumpsys window displays | grep mCurrentFocus

获取到的activity是

com.android.settings.bluetooth.DevicePickerActivity

相关代码路径为

packages\apps\Settings\src\com\android\settings\bluetooth\DevicePickerActivity.java

代码内容为：

public final class DevicePickerActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bluetooth_device_picker);
    }
}

只有一个onCreate的方法，再看一下bluetooth_device_picker.xml的内容：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <fragment android:id="@+id/bluetooth_fragment_settings"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            class="com.android.settings.bluetooth.DevicePickerFragment" />

</LinearLayout>

布局文件里只有一个fragment，界面的UI都是在DevicePickerFragment绘制的：

packages\apps\Settings\src\com\android\settings\bluetooth\DevicePickerFragment.java

在DevicePickerFragment.java中，有BluetoothProgressCategory类的实现，如下：

@VisibleForTesting
BluetoothProgressCategory mAvailableDevicesCategory;

mAvailableDevicesCategory = (BluetoothProgressCategory) findPreference(KEY_BT_DEVICE_LIST);

mAvailableDevicesCategory.setProgress(mLocalAdapter.isDiscovering());

mAvailableDevicesCategory.setProgress(started);

查看BluetoothProgressCategory.java

packages\apps\Settings\src\com\android\settings\bluetooth\BluetoothProgressCategory.java

public class BluetoothProgressCategory extends ProgressCategory {
    public BluetoothProgressCategory(Context context) {
        super(context);
        init();
    }

    public BluetoothProgressCategory(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public BluetoothProgressCategory(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    public BluetoothProgressCategory(Context context, AttributeSet attrs, int defStyleAttr,
            int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init();
    }

    private void init() {
        setEmptyTextRes(R.string.bluetooth_no_devices_found);
    }
}

继承了ProgressCategory.java，再看下这个类

packages\apps\Settings\src\com\android\settings\ProgressCategory.java

    public ProgressCategory(Context context) {
        super(context);
        setLayoutResource(R.layout.preference_progress_category);
    }

    public ProgressCategory(Context context, AttributeSet attrs) {
        super(context, attrs);
        setLayoutResource(R.layout.preference_progress_category);
    }

    public ProgressCategory(Context context, AttributeSet attrs,
            int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setLayoutResource(R.layout.preference_progress_category);
    }

    public ProgressCategory(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        setLayoutResource(R.layout.preference_progress_category);
    }

看下setLayoutResource引用的preference_progress_category.xml

packages\apps\Settings\res\layout\preference_progress_category.xml

<!-- Layout used for ProgressCategory in bluetooth settings. -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:gravity="center_vertical"
              android:orientation="horizontal"
              android:paddingStart="?android:attr/listPreferredItemPaddingStart"
              android:paddingTop="16dp"
              android:paddingBottom="16dp"
              android:paddingEnd="?android:attr/listPreferredItemPaddingEnd">

    <LinearLayout
        android:id="@+id/icon_container"
        android:layout_width="56dp"
        android:layout_height="wrap_content"
        android:gravity="start|center_vertical"
        android:orientation="horizontal">
        <com.android.internal.widget.PreferenceImageView
            android:id="@android:id/icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:maxWidth="18dp"
            android:maxHeight="18dp"/>
    </LinearLayout>

    <!-- This text view has the style of the list separator text view without the background and padding. -->
    <TextView
        android:id="@android:id/title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_gravity="start|center"
        android:textAppearance="@android:style/TextAppearance.Material.Body2"
        android:textColor="?android:attr/colorAccent"/>

    <ProgressBar
        android:id="@+id/scanning_progress"
        style="?android:attr/progressBarStyleSmallTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginStart="16dip"
        android:minWidth="32dp"
        android:text="@string/progress_scanning"/>

</LinearLayout>

蓝牙分享界面的搜索刷新图标就是ProgressBar这个布局组件了，将

android:layout_width="wrap_content"
android:layout_height="wrap_content"

改为自己想要的大小即可。