039android初级篇之获取已安装应用的图标签名等信息并保存

public class Info {
    Context context;
    PackageManager pm;

    public Info(Context context) {
        this.context = context;
        pm = context.getPackageManager();
    }

    /*
     * 获取程序 图标
     */
    public Drawable getAppIcon(String packname) {
        try {
            ApplicationInfo info = pm.getApplicationInfo(packname, 0);

            return info.loadIcon(pm);
        } catch (PackageManager.NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

        }
        return null;
    }

    /*
     *获取程序的版本号
     */
    public String getAppVersion(String packname) {

        try {
            PackageInfo packinfo = pm.getPackageInfo(packname, 0);
            return packinfo.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();

        }
        return null;
    }


    /*
     * 获取程序的名字
     */
    public String getAppName(String packname) {
        try {
            ApplicationInfo info = pm.getApplicationInfo(packname, 0);
            return info.loadLabel(pm).toString();
        } catch (PackageManager.NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

        }
        return null;
    }

    /*
     * 获取程序的权限
     */
    public String[] getAppPremission(String packname) {
        try {
            PackageInfo packinfo = pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);
            //获取到所有的权限
            return packinfo.requestedPermissions;

        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();

        }
        return null;
    }


    /*
     * 获取程序的签名
     */
    public String getAppSignature(String packname) {
        try {
            PackageInfo packinfo = pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);
            //获取到所有的权限
            return packinfo.signatures[0].toCharsString();

        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();

        }
        return null;
    }
}

void getIconByPackagename(Context mContext)
{
    String packagename = mEditText.getText().toString();
    Info info = new Info(getApplicationContext());
    String version = "appname:  "+info.getAppName(packagename)+"\n"
            +"version:  "+info.getAppVersion(packagename)+"\n";
    Log.e(TAG,"packagename:"+packagename + version);
    Drawable d = info.getAppIcon(packagename);
    if(d == null){
        Log.e(TAG,"Error: getAppIcon "+packagename);
        return ;
    }

    Bitmap bitmap = drawableToBitmap(d);
    Bitmap bitmapCuted = cutFromBitmap(bitmap);
   // saveBitmap(bitmapCuted,packagename+".png");
    mTextView.setText(version);
   imageView.setBackground(d);
    //imageView.setBackground(new BitmapDrawable(bitmapCuted));
    Toast.makeText(mContext,  packagename+" " +getBitmapsize2(bitmapCuted), Toast.LENGTH_SHORT).show();
}

public static Bitmap drawableToBitmap(Drawable drawable) {

    Bitmap bitmap = Bitmap.createBitmap(

            drawable.getIntrinsicWidth(),

            drawable.getIntrinsicHeight(),

            drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

                    : Bitmap.Config.RGB_565);

    Canvas canvas = new Canvas(bitmap);

    //canvas.setBitmap(bitmap);

    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());

    drawable.draw(canvas);

    return bitmap;

}

private static  final int ICON_LEN_LDPI120   =36;
private static  final int ICON_LEN_MDPI160   =48;
private static  final int ICON_LEN_HDPI240   =72;
private static  final int ICON_LEN_XHDPI320   =96;
private static  final int ICON_LEN_XXHDPI480   =144;
//需要切割的图片资源、切割起始点的X坐标、切割起始点的Y坐标、切割多宽、切割多高
public  Bitmap cutFromBitmap(Bitmap bitmap) {
    int starx=(90-72)/2;
    int stary=starx;
    int len;
    int oLen=bitmap.getWidth();

    switch (densityDpi) {
        case ICON_LEN_LDPI120: len =ICON_LEN_LDPI120; break;
        case ICON_LEN_MDPI160: len =ICON_LEN_MDPI160; break;
        case ICON_LEN_HDPI240: len =ICON_LEN_HDPI240; break;
        case ICON_LEN_XHDPI320: len =ICON_LEN_XHDPI320; break;
        case ICON_LEN_XXHDPI480: len =ICON_LEN_XXHDPI480; break;
        default: return bitmap;
    }

    if(oLen < len){
        Log.e(TAG,"ERROR:oLen < len");
        return bitmap;
    }
    Bitmap mm = Bitmap.createBitmap(bitmap,(oLen-len)/2,(oLen-len)/2,len,len);
    return mm;
}

  public void saveBitmap(Bitmap bm,String picName ) {
    Log.e(TAG, "保存图片");
    File f = new File("/sdcard/", picName);
    if (f.exists()) {
        f.delete();
    }
    try {
        FileOutputStream out = new FileOutputStream(f);
        bm.compress(Bitmap.CompressFormat.PNG, 90, out);
        out.flush();
        out.close();
        Log.i(TAG, "已经保存");
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}