Android Frameworks 开发总结之七

1.修改android 系统/system/下面文件时权限不够问题

下面提到的方式目前在Bobcat的userdebug image上测试可行，还没有在user上测试过.

修改前:

leif@leif:~$ adb root
restarting adbd as root
leif@leif:~$ adb disable-verity
verity is already disabled
using overlayfs
Now reboot your device for settings to take effect

重启机器后:

leif@leif:~$ adb root
restarting adbd as root
leif@leif:~$ adb remount
[libfs_mgr]dt_fstab: Skip disabled entry for partition vendor
[libfs_mgr]dt_fstab: Skip disabled entry for partition vendor
[libfs_mgr]dt_fstab: Skip disabled entry for partition vendor
[libfs_mgr]dt_fstab: Skip disabled entry for partition vendor
[libfs_mgr]dt_fstab: Skip disabled entry for partition vendor
remount succeeded

2.添加公共的系統資源

添加公共的系統資源, 有兩種方法

將需要的資源添加到SDK中進行使用比如添加資源到SDK中的Settings和BatteryManager中。添加資源後在開始編譯前, 需要將此資源聲明為@hide或執行make update-api操作, Android 10以後須執行make api-stubs-docs-update-current-api

將需要添加的資源作為私有的標識來使用, 添加資源後,需要在frameworks/base/core/res/res/symbols.xml中聲明此資源, 然後在java代碼中使用com.android.internal.R.來使用

3.查找某一個控件的ID

有的時候我們在debug某一個bug的時候需要查找其中的一个控件的ID，这个时候我们可以使用SDK中提供的tool进行查找，运行SDK/tools/monitor 脚本，在打开的Android Device Monitor中选中左上角的设备，再点击Dump View Hierarchy for UI Automator , 在中间出现的Device UI中用鼠標点击需要查找的控件的区域，在右侧会把当前点击区域的所有控件都列出来。

4.關於Snapdragon camera中的一些問題修改

4.1 菜單提示位置不正確
XXX機器由橫屏轉爲豎屏後，snapdragon camera的filters 和 scene mode提示位置不正確。修改位置：packages/apps/SnapdragonCamera/src/com/android/camera/ui/MenuHelp.java　
在setLocation中修改方向值

 private void setLocation(int w, int h) {
        int rotation = getUnifiedRotation();
        toIndex(mHelp0_0, w, h, rotation, 1, 3, HELP_0_0_INDEX);
        toIndex(mHelp1_0, w, h, rotation, 2, 2, HELP_1_0_INDEX);
        if(TsMakeupManager.HAS_TS_MAKEUP)
            toIndex(mHelp3_0, w, h, rotation, 3, 1, HELP_3_0_INDEX);
        if (!forCamera2) {
            toIndex(mHelp4_6, w, h, rotation, 3, 4, HELP_4_6_INDEX);
        } else {
            mHelp4_6.setVisibility(View.GONE);
        }
        toIndex(mOk2_4, w, h, rotation, 1, 5, OK_2_4_INDEX);
        fillArrows(w, h, rotation);
    }

修改方向後如果發現箭頭的弧度有問題，可以在fillArrows中修改

private void fillArrows(int w, int h, int rotation) {
        View v1 = new View(mContext);
        View v2 = new View(mContext);
        View v3 = new View(mContext);
        {
            toIndex(v1, w, h, rotation, 1, 3, -1);
            toIndex(v2, w, h, rotation, 0, 1, -1);
            toIndex(v3, w, h, rotation, 0, 0, -1);
            float[] x = {v1.getX()-POINT_MARGIN, v2.getX(), v3.getX()};
            float[] y = {v1.getY()-POINT_MARGIN, v2.getY(), v3.getY()};
            mArrows.addPath(x, y);
        }

        {
            toIndex(v1, w, h, rotation, 2, 2, -1);
            toIndex(v2, w, h, rotation, 1, 1, -1);
            toIndex(v3, w, h, rotation, 1, 0, -1);
            float[] x = {v1.getX()-POINT_MARGIN, v2.getX(), v3.getX()};
            float[] y = {v1.getY()-POINT_MARGIN, v2.getY(), v3.getY()};
            mArrows.addPath(x, y);
        }

        if(TsMakeupManager.HAS_TS_MAKEUP) {
            toIndex(v1, w, h, rotation, 3, 1, -1);
            toIndex(v2, w, h, rotation, 3, 0, -1);
            float[] x = {v1.getX(), v2.getX()};
            float[] y = {v1.getY()-POINT_MARGIN*2, v2.getY()+POINT_MARGIN};
            mArrows.addPath(x, y);
        }

        if (!forCamera2) {
            toIndex(v1, w, h, rotation, 3, 4, -1);
            toIndex(v2, w, h, rotation, 3, 5, -1);
            toIndex(v3, w, h, rotation, 4, 6, -1);
            float[] x = {v1.getX(), v2.getX(), v3.getX()};
            float[] y = {v1.getY()+POINT_MARGIN, v2.getY(), v3.getY()-POINT_MARGIN};
            mArrows.addPath(x, y);
        }
    }

4.2修改菜單的位置

Snapdragon camera中把菜單的位置從上/下改爲左/右,修改位置: packages/apps/SnapdragonCamera/src/com/android/camera/ui/OneUICameraControls.java

調整位置到左右, 修改setLocation方法

private void setLocation(int w, int h) {
        int rotation = getUnifiedRotation();
        setLocationRight(mSceneModeSwitcher, false, 4);
        setLocationRight(mFilterModeSwitcher, false, 3);
        if (mIsVideoMode) {
            setLocationRight(mMute, false, 2);
            setLocationRight(mFlashButton, false, 1);
            setLocationRight(mPauseButton, true, 3);
            setLocationRight(mShutter, true , 2.15f);
            setLocationRight(mVideoShutter, true, 0.9f);
            setLocationRight(mExitBestPhotpMode ,true, 0);
        } else {
            setLocation(mFrontBackSwitcher, true, 2);
            setLocationRight(mFlashButton, false, 1);
            if (mIntentMode == CaptureModule.INTENT_MODE_CAPTURE) {
                setLocationRight(mShutter, true, 2.15f);
                setLocation(mCancelButton, false, 0.85f);
            } else if (mIntentMode == CaptureModule.INTENT_MODE_VIDEO) {
                setLocationRight(mVideoShutter, true, 0.9f);
                setLocation(mCancelButton, false, 0.85f);
            } else {
                setLocationRight(mShutter, true, 2.15f);
                setLocationRight(mPreview, true, 4);
                setLocationRight(mVideoShutter, true, 0.9f);
            }
            setLocationRight(mExitBestPhotpMode ,true, 0);
        }
        setLocationCustomBottom(mMakeupSeekBarLayout, 0, 1);
        setLocationRight(mProModeCloseButton, true, 0);

        layoutToast(mRefocusToast, w, h, rotation);
    }

    private void setLocationRight(View view, boolean right,float index){
        if(view == null){
            return;
        }
        int w = view.getMeasuredWidth();
        int h = view.getMeasuredHeight();
        float bW = mWidth / 5f;
        if(right){
            view.setX(bW * 4 + (bW - w) / 4 * 3);
        }else {
            view.setX((bW - w) / 4);
        }

        float bH = mHeight / 5f;
        view.setY(bH * index + (bH - h)/2);
    }

filters菜單與filters點擊按鈕重合了，修改位置：packages/apps/SnapdragonCamera/src/com/android/camera/CaptureUI.java文件中的addFilterMode方法

public void addFilterMode() {
        if (mSettingsManager.getValue(SettingsManager.KEY_COLOR_EFFECT) == null)
            return;

        ......

        if (!portrait) {
            params = new ViewGroup.LayoutParams(size, FrameLayout.LayoutParams.MATCH_PARENT);
            mFilterLayout.setLayoutParams(params);
            ((ViewGroup) mRootView).addView(mFilterLayout);
            mFilterLayout.setX(size/2); 修改坐標x的位置
        } else {

打開Premode後，Premode菜單與左右兩邊的菜單有重合。

修改：packages/apps/SnapdragonCamera/src/com/android/camera/ui/ProMode.java文件中的onLayout方法:

protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        mWidth = right - left;
        mHeight = bottom - top;

        mCurveLeft = mWidth / 10 *2 ;
        mCurveRight = mWidth - mCurveLeft;
        mCurveHeight = mWidth / 7;
        mCurveY = (int) (mHeight * 0.67);

        float cx = (mCurveLeft + mCurveRight) / 2;
        mCurvePath.reset();
        mCurvePath.moveTo(mCurveLeft, mCurveY);
        mCurvePath.quadTo(cx, mCurveY - mCurveHeight, mCurveRight, mCurveY);
        mCurveMeasure = new PathMeasure(mCurvePath, false);
    }

修改packages/apps/SnapdragonCamera/src/com/android/camera/ui/OneUICameraControls.java 文件中的setProModeParameters和initializeProMode方法:

 private void setProModeParameters() {
        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(mWidth/ 5, mWidth/8);
        mExposureText.setLayoutParams(lp);
        mManualText.setLayoutParams(lp);
        mWhiteBalanceText.setLayoutParams(lp);
        mIsoText.setLayoutParams(lp);
    }

    private void initializeProMode(boolean promode) {
        if (!promode) {
            mProMode.setMode(ProMode.NO_MODE);
            mProModeLayout.setVisibility(INVISIBLE);
            mProModeCloseButton.setVisibility(INVISIBLE);
            return;
        }
        mProModeLayout.setVisibility(VISIBLE);
        mProModeCloseButton.setVisibility(VISIBLE);
        mProModeLayout.setY((mHeight - mBottom - mProModeLayout.getHeight()) / 3);
        if (mOrientation == 0 || mOrientation == 180) {
            mProModeLayout.setX(mWidth / 10);
        } else {
            mProModeLayout.setX((mWidth - mWidth / 8 * 4) / 2);
        }
    }

修改錄音時間Text位置:/res/layout/capture_module.xml

<FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <com.android.camera.ui.RotateLayout
            android:id="@+id/recording_time_rect"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true"
            android:visibility="gone"
            android:layout_marginLeft="128dp"
            android:layout_marginBottom="150dp">
            <include
                android:id="@+id/labels"
                layout="@layout/viewfinder_labels_video"/>
        </com.android.camera.ui.RotateLayout>
    </FrameLayout>

修改Filters和Premode Text位置:/res/layout/scene_mode_label.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="30dp"
    android:layout_marginLeft="100dp"
    android:gravity="bottom">
    .......
</LinearLayout>